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ENSTROM F-28F Series Maintenance Manual

ENSTROM F-28F Series Maintenance Manual

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ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL

REV.

ISSUE

DATE

1

4/3/86

2

11/18/88

3

3/94

4

6/4/12

5

11/5/13

6

4/7/15

7

8/22/16

8

9/20/17

9

12/14/17

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RECORD OF REVISIONS

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8/17/12

JW

8/17/12

JW

8/17/12

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8/17/12

JW

2/21/14

AD

7/22/15

LN

9/2/16

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10/2/17

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12/22/17

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Page 1 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL RECORD OF REVISIONS REV. ISSUE DATE REV. ISSUE DATE DATE INSERTED DATE INSERTED 4/3/86 8/17/12 11/18/88 8/17/12 3/94 8/17/12 6/4/12 8/17/12 11/5/13 2/21/14 4/7/15 7/22/15 8/22/16 9/2/16 9/20/17 10/2/17 12/14/17 12/22/17 Maintain this record in the front of the manual.
Page 2 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 3 ENSTROM F-28F AND 280F SERIES MAINTENANCE MANUAL The Airworthiness Limitations section is FAA approved and specifies inspections and other maintenance required under 14 CFR §§ 43.16 and 91.403 of the Federal Aviation Regulations unless an alternative program has been FAA approved.
Page 4 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 5: Uncontrolled Copy When Downloaded Or Printed Rev
This maintenance manual is prepared and distributed by The Enstrom Helicopter Corporation and is intended for use by personnel responsible for maintaining Enstrom F-28F, 280F, and 280FX helicopters. This manual is periodically revised. If, in the opinion of the user, any information has been omitted or requires clarification, please direct your comments to Enstrom via this form (duplicate) or other similar form.
Page 6 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 7 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL TABLE OF CONTENTS Section 1 – Introduction Table of Contents ..................MM-1-1 1-1. Manual Arrangement .................MM-1-3 1-2. Aircraft Effectivity ..................MM-1-3 1-3. Maintenance Manual Supplements ............MM-1-3 1-4. Maintenance Manual Changes and Revisions .......... MM-1-3 1-5.
Page 8 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-9. Overrunning Clutch ................. MM-4-27 4-10. Servicing ..................MM-4-27 4-11. Main Rotor Transmission ................ MM-4-28 4-12. Servicing ..................MM-4-28 4-13. Draining ..................MM-4-29 4-13.1 Flushing ..................MM-4-29 4-14. Tail Rotor Transmission ................MM-4-30 4-15. Servicing ..................MM-4-30 4-16.
Page 9 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-58. Main Rotor Blade Strike/Sudden Stoppage (Major) .......MM-4-61 4-59. Tail Rotor Blade Strike/Sudden Stoppage ........MM-4-62 4-60. Hard Landing ................. MM-4-62 4-61. Main Rotor Overspeed..............MM-4-63 4-62. Main or Tail Rotor Transmission Chip Indication ......MM-4-64 4-63.
Page 10 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Section 7 – Instruments 7-1. Instrument Panel ..................MM-7-1 7-2. Altimeter ....................MM-7-1 7-3. Airspeed Indicator ..................MM-7-4 7-4. Engine and Rotor Tachometer ..............MM-7-5 7-5. Fuel Quantity Indicator ................MM-7-5 7-6. Engine Oil Pressure Gauge ..............MM-7-6 7-7.
Page 11 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 9-5. Dampers....................MM-9-32 9-6. Main Rotor Blades................... MM-9-49 9-7. Description ..................MM-9-49 9-8. Removal..................MM-9-49 9-9. Inspection ..................MM-9-52 9-10. Repair .................... MM-9-62 9-11. Refinishing ..................MM-9-74 9-12. Corrosion Prevention ..............MM-9-75 9-13. Installation..................MM-9-76 Section 10 –...
Page 12: Table Of Contents
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 13-5. Turbocharger ..................MM-13-47 13-6. Turbocharger Static Air Fuel Nozzle Pressure System ......MM-13-49 13-7. Primary Airflow System ................. MM-13-52 13-8. Cooling System ..................MM-13-57 13-9. Ignition System..................MM-13-64 13-10. Fuel System ..................MM-13-72 13-11. Lubricating System ................MM-13-88 13-12.
Page 13 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Section 22 – [Reserved] Section 23 – Flight Controls 23-1. General ....................MM-23-1 23-2. Push-Pull Tubes ..................MM-23-1 Section 24 – Instruments 24-1. Engine Monitor ..................MM-24-1 24-2. Description ..................MM-24-1 24-3. Maintenance .................. MM-24-2 24-4.
Page 14 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 15 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL LOG OF PAGES AND REVISIONS REV. NO REV DATE DESCRIPTION DATE FAA APPROVED vi, vii, viii and ix MM-3-1 W. F. Horn Added Sections 15 through 25 inclusively. Apr 3/86 Apr 3/86 ACE 115C Section 17 Supplemental Airworthiness Limitations MM-2-10, 2-14 &...
Page 16 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL REV. NO REV DATE DESCRIPTION DATE FAA APPROVED Cover xi, xii MM-2-13 & 2-14 MM-2-16 through MM-2-19 MM-4-43, MM-4-45 through MM-4-48, MM-4-51, MM-4-63 Apr 7/15 MM-6-4, 6-5 & 6-6 MM-9-27, MM-9-29 MM-10-13 & 10-14, MM-10-14.2 MM-11-32, MM-11-52, MM-11-65 MM-13-11 &...
Page 17 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SECTION 1 INTRODUCTION TABLE OF CONTENTS Paragraph Description Page Table of Contents ..................MM-1-1 1-1. Manual Arrangement .................MM-1-3 1-2. Aircraft Effectivity ..................MM-1-3 1-3. Maintenance Manual Supplements ............MM-1-3 1-4. Maintenance Manual Changes and Revisions .......... MM-1-3 1-5.
Page 18 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SECTION 1 INTRODUCTION TABLE OF CONTENTS Paragraph Description Page INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 MM-1-2 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 19: Manual Arrangement
Supplement 1: Avionic Systems, Revision 7, Dated: Aug 28/17. 1-4. Maintenance Manual Changes and Revisions Subsequent to the publication of the initial issue of the Enstrom F-28F/280F Series Maintenance Manual, changes in aircraft equipment, support concepts and procedures, as well as information developed by experience, may affect the contents of the manual.
Page 20 Directive Bulletins are also located under the Tech Publications section of the website. Enstrom distributes maintenance manual reissues and revisions in hardcopy form via mail to owners and operators who are registered with Enstrom. Notice of recently released Service Information Letters and Service Directive Bulletins is provided via a postcard mailing.
Page 21 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 1-6. Application of Warnings, Cautions, and Notes Warnings, Cautions, and Notes emphasize important and critical instructions and are used for the following conditions. WARNING Calls attention to use of materials, processes, methods, or procedures that must be followed to avoid personal injury or loss of life.
Page 22 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-1-6 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 23: Table Of Contents
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SECTION 2 GENERAL INFORMATION TABLE OF CONTENTS Paragraph Description Page Table of Contents ..................MM-2-1 2-1. General Description .................. MM-2-3 2-2. General Arrangement ................MM-2-3 2-3. Principal Dimensions .................MM-2-3 2-4. Airframe..................... MM-2-3 2-5. Landing Gear .................... MM-2-9 2-6.
Page 24 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SECTION 2 GENERAL INFORMATION TABLE OF CONTENTS Paragraph Description Page INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 MM-2-2 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 25 2-1. General Description The F-28F, 280F, and 280FX helicopters are a 3 bladed, single engine helicopter manufactured by the Enstrom Helicopter Corporation and certificated by the FAA under CAR 6. Additionally, the F-28F, 280F, and 280FX models have demonstrated compliance with 14 CFR 36, amendment 20 (Appendix J), effective September 11, 1992.
Page 26 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Sheet 1 of 4 Figure 2-1. Principal Dimensions - F-28F Pre-1986 (S/N 743 and Prior) UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 MM-2-4 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 27 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Sheet 2 of 4 Figure 2-1. Principal Dimensions - F-28F Post-1986 (S/N 744 and Subsequent) UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 MM-2-5 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 28 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Sheet 3 of 4 Figure 2-1. Principal Dimensions - 280F UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 MM-2-6 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 29 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Sheet 4 of 4 Figure 2-1. Principal Dimensions - 280FX UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 MM-2-7 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 30 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Table 2-1. F-28F/280F/FX Specifications Model F-28F 280F/FX Power Plant: Designation HIO-360-F1AD HIO-360-F1AD Cylinders Normal Power 225 (168 kW) 225 (168 kW) Normal RPM 3050 3050 Specific Fuel Consumption .69 lb/hp-hr (.42 g/W-h) .69 lb/hp-hr (.42 g/W-h)
Page 31 The Textron-Lycoming HIO-360 series engine is a four cylinder, direct drive, horizontally opposed, air cooled, fuel injected engine. The F-28F/280F series helicopters are equipped with an Enstrom installed turbocharger system which allows the engine to produce its rated horsepower up to the certified altitude limit.
Page 32 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 2-9. Power Train The power train includes the main rotor transmission, upper pulley/overrunning clutch assembly, drive belt, belt drive system, tail rotor drive shaft, and the tail rotor transmission. A. Main Rotor Transmission: The main rotor transmission provides a 7.154:1 reduction ratio between the upper pulley and main rotor system.
Page 33 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 2-14. Vendor Manuals The following components listed in Table 2-2 are to be maintained I/A/W the manufacturer's instructions to ensure the continued airworthiness of the aircraft. The owner/operator is responsible for ensuring that current maintenance publications are available to ensure continued airworthiness of the aircraft.
Page 34 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 MM-2-12 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 35 The special tools listed in Table 2-2 are used for removal, installation, and overhaul of components used on the F-28F/280F series aircraft: NOTE The special tools listed in Table 2-2 are available through Enstrom’s Tool Rental Program. Contact Enstrom Helicopter Product Support for details. Table 2-3. Special Tools...
Page 36 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Table 2-3. Special Tools Part Number Nomenclature T-0080 Tail Rotor Rigging Tool T-0086 Upper Guidetube Nut Tool T-0087-15 Tail Rotor Assembly Static Balance Mandrel T-0088 Tail Rotor Driveshaft Alignment Tool T-0092-5 Taper Pin Removal Tool...
Page 37 Damper Bleeding/Servicing Tool (2 Required) Main Rotor Transmission Stand Main Rotor Hub Stand Sprag Clutch Purge Tool Contact the Enstrom Helicopter Product Support for assistance in obtaining these tools. UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 MM-2-15 Nov 5/13...
Page 38 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 2-16. Torque Data Unless specified in Table 2-4 and/or in this manual’s maintenance procedures or as called out in the component manufacturer’s specifications, all hardware should be torqued to standard torque values listed in Tables 2-5 through 2-12.
Page 39 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Table 2-5. Torque Values for Nuts and Bolts CAUTION THE FOLLOWING TORQUE VALUES ARE DERIVED FROM OIL FREE CADMIUM PLATED THREADS. TORQUE LIMITS RECOMMENDED FOR INSTAL- MAXIMUM ALLOWABLE TIGHTENING LATION (BOLTS LOADED PRIMARILY IN SHEAR)
Page 40 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Table 2-7. Fittings, Hose Assemblies Flexible Hose or Tube Fittings (excluding nylon pitot static lines) Measurements based on Hose Inside Diameter or Fitting Size Fitting Size Tube Size Thread Flex Hose and 6061-T6 Aluminum Steel (Torque Limits...
Page 41 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Table 2-10. Pipe Plugs NOTE When threading bolts into engine housings, refer to the applicable engine manual for standard torque limits. Torque Limits (inch-pounds) Thread Size (inches) 1/16-27 NPT 1/8-27 NPT 1/4-18 NPT 3/8-18 NPT...
Page 42 NOTE Enstrom does not stock engine parts for customer service use. Obtain engine parts through Lycoming Engines Distribution Partners. For assistance, refer to the Genuine Parts tab on the Lycoming Products web page to find distributors near you (www.lycoming.com).
Page 43 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SECTION 3 AIRWORTHINESS LIMITATIONS The Airworthiness Limitations Section is FAA approved and specifies inspections and other maintenance required under 14 CFR §§ 43.16 and 91.403 of the Federal Aviation Regulations unless an alternative program has been FAA approved.
Page 44 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SECTION 3 LOG OF REVISIONS Rev. Rev. Pages Approval F.A.A. Num. Date Affected Date Approved 4/3/86 MM-3-1 4/3/86 W. F. Horn 11/18/88 MM-3-13 and MM-3-20 11/18/88 W. F. Horn None 6/21/12 MM-3-1 through MM-3-6 Jul 2/12 G.
Page 45 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SECTION 3 EASA LOG OF REVISIONS Rev. FAA Approval on Behalf Date EASA Approved Num. of EASA 9/28/03 Article 3, Commission Regulation (EU) 748/2012 9/28/03 Article 3, Commission Regulation (EU) 748/2012 7/9/15 FAA/EASA T.I.P.* G. J. Michalik 9/9/16 FAA/EASA T.I.P.*...
Page 46: Retirement Life Items
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SECTION 3 AIRWORTHINESS LIMITATIONS TABLE OF CONTENTS Paragraph Description Page FAA Cover ....................MM-3-1 Log of Revisions ..................MM-3-2 EASA Log of Revisions ................MM-3-3 Table of Contents ..................MM-3-4 3-1. Retirement Life Items ................MM-3-5 3-2. Mandatory Inspection Items ..............MM-3-5 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev.
Page 47: Retirement Life Items
3-2. Mandatory Inspection Items The Enstrom F-28F and 280F Series helicopters have no mandatory inspection items. Table 3-1. Retirement Life Items ITEM...
Page 48 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Applies to all dash numbers. ** Retire from service 5 calendar years from date of manufacture all Lamiflex bearings serial number 5997 and prior. Retire from service 5 calendar years from date of installation (defined as the date the Lamiflex bearing packaging is opened) or 8 calendar years from date of manufacture, whichever occurs first, all Lamiflex bearings serial numbers 5998 and subsequent.
Page 49 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SECTION 4 SERVICING, RECOMMENDED OVERHAULS, INSPECTIONS, AND GENERAL MAINTENANCE TABLE OF CONTENTS Paragraph Description Page Table of Contents ..................MM-4-1 4-1. Servicing ....................MM-4-5 4-2. Description ..................MM-4-5 4-3. Fuel System ................... MM-4-25 4-4. Servicing ..................MM-4-25 4-5.
Page 50 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SECTION 4 SERVICING, RECOMMENDED OVERHAULS, INSPECTIONS, AND GENERAL MAINTENANCE TABLE OF CONTENTS Paragraph Description Page 4-39. Cyclic Swashplate Bearing ..............MM-4-37 4-40. Lubrication ..................MM-4-37 4-41. Idler Pulley Bearing ................MM-4-48 4-42. Lubrication ..................MM-4-38 4-43.
Page 51 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SECTION 4 SERVICING, RECOMMENDED OVERHAULS, INSPECTIONS, AND GENERAL MAINTENANCE TABLE OF CONTENTS Paragraph Description Page 4-80. Storage from 45 Days to 6 Months ..........MM-4-75 4-81. Storage for Longer than 6 Months ..........MM-4-75 4-82.
Page 52: Uncontrolled Copy When Downloaded Or Printed Rev
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 4 MM-4-4 Jun 21/12 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 53 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-1. Servicing 4-2. Description – Servicing A. Servicing of the F-28/280F series helicopter is normally accomplished at specified hourly intervals. Operators should take into consideration the environmental conditions and determine whether more frequent servicing intervals are necessary. Refer to Tables 4-1 thru 4-7 and Figure 4-1 for approved fuels, oils, lubricants, intervals, and locations.
Page 54 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Table 4-1. Fuels, Lubricants, Specification, and Capacities SYSTEM/COMPONENT SPECIFICATION CAPACITY Idler Pulley Bearings MIL-PRF-81322 (Note 12) As Required Snubber Roller Bearings MIL-PRF-81322 (Note 12) As Required MIL-G-25537 or MIL-PRF-81322 Drive Belt Clutch Cable (Notes 11, 12, 13)
Page 55 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Note 1: Refer to Textron-Lycoming Service Instruction 1070 (latest revision) for fuel recommendations. Note 2: Refer to Textron-Lycoming Service Instruction 1014 (latest revision) for lubricating oil recommendations and seasonal oil grade recommendations. Note 3: Textron-Lycoming recommends using the following engine oil for the specified...
Page 56 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Table 4-2. Servicing Intervals, Methods, and Locations NUMBER OF SERVICING SYSTEM/COMPONENT FREQUENCY METHOD POINTS (LOCATION) (Note 1) Fuel As Required 2 places (A-1) Engine Oil 50 Hours/As Required Filler Can 1 place (A-3) Main Rotor Transmission...
Page 57 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Note 1: Refer to the Figure 4-1 illustrations on pages MM-4-13 through MM-4-24 for the lubrication/servicing locations. Note 2: Refer to paragraph 9-4, G for lubrication procedure. Note 3: Hand pack the bearing if the bearing housing is not equipped with a grease fitting.
Page 58 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Table 4-3. Qualified Domestic Commercial Oils for MIL-PRF-7808 MANUFACTURER MANUFACTURER'S DESIGNATION Air BP Lubricants, Inc. BP Turbo Oil 2389 American Oil American PQ Lubricant 689 Castrol, Inc. Brayco 880 Exxon Mobil Corp. EXXON ETO 2389 Exxon Mobil Corp.
Page 59 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Table 4-5. Qualified Domestic Commercial Oils for SAE-J2360/API GL-5/MIL-PRF-2105 MANUFACTURER MANUFACTURER'S DESIGNATION Exxon Mobil Corp. Mobil 1 Synthetic Gear Lubricant LS 75W-90 Mobil Delvac Synthetic Gear Oil 75W-90 Mobilube HD LS 80W-90 Mobilube HD Plus 80W-90...
Page 60 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Table 4-8. Qualified Domestic Commercial Greases for MIL-PRF-23827 MANUFACTURER MANUFACTURER'S DESIGNATION NYCO America Nyco Grease GN10 Anderol Specialty Lubricants Royco 27 Exxon Mobil Corp. Beacon 325 Exxon Mobil Corp. Mobilgrease 27 Petronomics Manufacturing Petronomics Plus M-P Aircraft Grease...
Page 61 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL View A Fuel Tanks (2 places) Fuel Tank Sump Drain (2 places) Engine Oil Filler Engine Oil Dipstick View B Main Fuel Filter (P/N 33-199-916) Sheet 1 of 12 Figure 4-1. Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev.
Page 62 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL View C Engine Oil Filter (P/N CH48103) View D Engine Air Filter (P/N 6487923) Engine Main Oil Cooler Engine Oil Sump Drain Aux. Engine Oil Cooler Main Fuel Filter Drain Sheet 2 of 12 Figure 4-1. Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev.
Page 63 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL View E Main Rotor Gearbox Drain and Magnetic Particle Plug Main Rotor Gearbox Oil Level Sight Gauge View F Main Rotor Gearbox Filler and Screen Sheet 3 of 12 Figure 4-1. Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev.
Page 64 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL View G Main Rotor Gearbox Overrunning Clutch Drain and Filler Plugs Upper Jackstrut Bearing Grease Fitting View H Lower Jackstrut Bearing Grease Fitting and Purge Plug Sheet 4 of 12 Figure 4-1. Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev.
Page 65 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL View I Idler Roller Bearings (2 places) Idler Strap Bushings (2 places) View J Drive Belt Snubber Roller Bearings Sheet 5 of 12 Figure 4-1. Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 4...
Page 66 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL View K Drive Belt Clutch Engagement Cable Grease Fitting (2 places: Aft, top photo; Forward, bottom photo) Sheet 6 of 12 Figure 4-1. Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 4 MM-4-18 Jun 21/12...
Page 67 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL View L Rotor Tach Drive Grease Fitting View M Tail Rotor Drive Shaft Bearings (5 places) Sheet 7 of 12 Figure 4-1. Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 4 MM-4-19 Jun 21/12...
Page 68 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL View N Tail Rotor Gearbox Drain and Magnetic Particle Plug Tail Rotor Gearbox Filler Plug Tail Rotor Gearbox Sight Gauge Tail Rotor Control Yoke Pivot Points (4 places) Tail Rotor Feathering Bearings (2 places) Tail Rotor Teetering Bearings (2 places)
Page 69 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL View O Collective Guidetube Bearing Grease Fitting Cyclic Swashplate Bearing Grease Fitting Cyclic Swashplate Control Rod Pivots Sheet 9 of 12 Figure 4-1. Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 4 MM-4-21 Jun 21/12...
Page 70 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL View P Pitch Change Bellcrank Pivot Bearings (3 places) Pitch Change Bellcrank Inboard Pivot Points (3 places) Main Rotor Lead/Lag Bearings (3 places) Main Rotor Feathering Bearings (6 places) Main Rotor Damper Service Plugs View Q...
Page 71 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL View R Landing Gear Oleo Service Point Ground Handling Wheel Bearing View S Battery Servicing Points (Forward, left photo, or aft, right photo, installation) Sheet 11 of 12 Figure 4-1. Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev.
Page 72 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL View T Tail Rotor Pedals Lubricating Points (4 places) Tail Rotor Control Bushings (4 places) View U Cabin Flight Control Bellcrank Pivot Bushings (11 places) Sheet 12 of 12 Figure 4-1. Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev.
Page 73 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-3. Fuel System 4-4. Servicing – Fuel System (Figure 4-1, View A and View B) NOTE Refer to Table 4-1 for system capacity and approved fuels. WARNING In the event of a major spillage of fuel, all powered equipment must be shut down.
Page 74 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL G. Remove the fuel nozzle and install the fuel cap. NOTE Because of cross-feeding which occurs during refueling, it may be necessary to add fuel to the first fuel tank refueled to obtain the required fuel quantity.
Page 75 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL E. If servicing after draining the engine oil system, ground run the engine in accordance with the applicable rotorcraft flight manual/pilots operating manual. After the ground run, check the oil level and service as required.
Page 76 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL NOTE Because of the location of the filler passage, it is possible for the filler port to be partially blocked by the clutch sprags. If the filler port is partially blocked, the clutch will take oil very slowly.
Page 77 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-13. Draining – Main Rotor Transmission A. Remove the access panel located below the left side fuel tank. B. Place a trough under the chip detector/magnetic plug located by the aft left side transmission mount and use a suitable container to collect the oil.
Page 78 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Add 4 quarts of the gear lube currently used in the gearbox (ref. Table 4-1). Manually rotate the main rotor hub to spin the gearbox 7-10 revolutions. K. Remove the magnetic plug/chip detector and drain the gearbox. Collect the oil to inspect for contamination.
Page 79 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-16. Draining – Tail Rotor Transmission A. If equipped with a chip detector, remove the chip detector from the quick disconnect receptacle. B. Place a suitable container under the receptacle/magnetic plug. C. Remove the quick disconnect receptacle/magnetic plug and drain the transmission.
Page 80 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-17. Main Rotor Dampers (Figure 4-5, View P) 4-18. Servicing – Main Rotor Dampers NOTE Refer to Table 4-1 for system capacity and approved oil. NOTE The dampers may be serviced while installed on or removed from the aircraft.
Page 81 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Install the reservoir plugs and lockwire (.025). Replace the plug O-rings as required. 4-19. Oleos (Figure 4-1, View R) 4-20. Servicing – Oleos NOTES Check the serviceability of the oleos by rocking the aircraft to distribute the weight of the aircraft evenly.
Page 82 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL After the pressure in the oleo has equalized to the regulator pressure, close the oleo valve. Turn off the nitrogen tank and set the regulator pressure back to zero. Disconnect the service equipment and install the valve cap.
Page 83 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-27. Main Rotor Blade Grip (Figure 4-1, View P, and Figure 4-2) 4-28. Lubrication - Main Rotor Blade Grip NOTE Purge all three blade grips when lubricating the hub to prevent an "out of balance" condition.
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Page 85 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 4-2. Main Rotor Blade Grip, Lead-Lag Bearing, and Flapping Bearing Lubrication UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 4 MM-4-35 Jun 21/12 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 86 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-29. Main Rotor Flapping Bearings (Figure 4-1, View Q, and Figure 4-2) 4-30. Lubrication – Main Rotor Flapping Bearings NOTE Refer to paragraphs 4-20 through 4-22 if the main rotor hub assembly is equipped with oil lubricated flapping bearings.
Page 87 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-35. Upper Pulley (Jackstrut) Bearing (Figure 4-1, View G) 4-36. Lubrication – Upper Pulley (Jackstrut) Bearing A. Purge lubricate the bearing via the grease fitting. 4-37. Collective Guidetube Bearing (Figure 4-1, View O) 4-38. Lubrication – Collective Guidetube Bearing A.
Page 88 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-41. Idler Pulley Bearings (Figure 4-1, View I) 4-42. Lubrication – Idler Pulley Bearings 4-43. Lubrication, Preferred Method – Idler Pulley Bearings NOTE Purge the needle prior to each use and lubricate the external surface of the needle with grease to prevent seal damage.
Page 89 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-45. Recommended Overhaul Cycles A. Refer to Table 4-9 for components with recommended overhaul cycles established by Enstrom Helicopter Corporation and other component manufacturers. NOTE Refer to the latest revision of Textron-Lycoming Service Instruction No. 1009 for the recommended overhaul cycle for the HIO-360 Series engine.
Page 90 C. Recommended component overhaul cycles are specified in paragraph 4-45. 4-48. Daily Inspection The Enstrom F-28F, 280F, and 280FX do not require a mandatory daily (maintenance) inspection. Owner/Operators opting to have maintenance personnel check the aircraft should perform a pre-flight check I/A/W the F-28F, 280F, or 280FX Rotorcraft Flight Manual.
Page 91 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-50. 50 Hour Inspection Guide – Periodic Inspection AIRCRAFT REGISTRATION NUMBER: SIGNATURE: AIRCRAFT SERIAL NUMBER: DATE: HOURS: Engine: Flight: 50 HOUR INSPECTION GUIDE INITIAL INITIAL EACH ITEM AFTER ACCOMPLISHMENT 1. GENERAL INSPECTION Inspect the engine records and discrepancy sheets.
Page 92 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-51. 100 Hour/Annual Inspection Guide – Periodic Inspection AIRCRAFT REGISTRATION NUMBER: SIGNATURE: AIRCRAFT SERIAL NUMBER: DATE: HOURS: Engine: Flight: 100 HOUR/ANNUAL INSPECTION GUIDE INITIAL INITIAL EACH ITEM AFTER ACCOMPLISHMENT 1. GENERAL INSPECTION Perform a complete 50 Hour Inspection.
Page 93 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 100 HOUR/ANNUAL INSPECTION GUIDE Fuel System: Inspect the fuel tanks for evidence of loose rivets, bond separation, leaks, _________ condition of gasket in the fuel caps, and proper operation of the fuel caps. Inspect the fuel supply lines for condition, leaks, and security of installation.
Page 94 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 100 HOUR/ANNUAL INSPECTION GUIDE Inspect and clean the main fuel filter element. _________ Inspect the fuel lines for condition, chaffing, and security. _________ Inspect the fuel nozzle air manifolds and lines for condition and security of _________ installation.
Page 95 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 100 HOUR/ANNUAL INSPECTION GUIDE Inspect the cowling and baffling for condition and security of installation. _________ Inspect the cooling fan for condition and security of the fan blades and _________ proper clearance at the shroud.
Page 96 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 100 HOUR/ANNUAL INSPECTION GUIDE Inspect the vent line and check valve for condition and security of _________ installation. Inspect engine access panel seal for condition. _________ N. Engine Cylinder Compression: Inspect engine cylinders for proper compression (Refer to the latest revision of Textron-Lycoming Service Instruction No.
Page 97 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 100 HOUR/ANNUAL INSPECTION GUIDE Ground Handling Wheels: Inspect the ground handling wheels and brackets for condition and security _________ of installation. Inspect the tires for condition and proper inflation. _________ Inspect the quick disconnect locking pins for condition.
Page 98 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 100 HOUR/ANNUAL INSPECTION GUIDE C. Jackstrut and Lower Pulley Assembly: Inspect the jackstrut for bond separations, condition, and security of _________ installation. Inspect the lower pulley for wear, excessive grease leakage, condition, and _________ security of installation.
Page 99 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 100 HOUR/ANNUAL INSPECTION GUIDE D. Extension (Stinger) Tube: Inspect the extension tube for damage and security of installation. _________ Inspect extension tube mounting brackets damage _________ loose/sheared rivets/fasteners. Tail Rotor Driveshaft: Inspect the tail rotor driveshaft, hubs, and taper pins for damage and _________ security of installation.
Page 100 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 100 HOUR/ANNUAL INSPECTION GUIDE 9. TAIL ROTOR ASSEMBLY Tail Rotor Assembly: Inspect the tail rotor blade and grip assemblies for cracks, nicks, dents, scratches, bends, fretting, bond separations, corrosion, loose tip rivets, and condition of strike tabs.
Page 101 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 100 HOUR/ANNUAL INSPECTION GUIDE Main Rotor Retention Assemblies: Inspect the flapping stops and pitch horn for condition and security of _________ installation. Inspect the blade grips and drag links for condition and security of _________ installation.
Page 102 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 100 HOUR/ANNUAL INSPECTION GUIDE 12. SWASHPLATE CONTROL SYSTEM Swashplate Assembly: Inspect the lower swashplate assembly for condition and security of _________ installation. Inspect the lower swashplate assembly universal joint for looseness (Refer _________ to SDB 091, latest revision).
Page 103 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 100 HOUR/ANNUAL INSPECTION GUIDE Inspect the safety belts and shoulder harnesses for condition, proper _________ operation, and security of attachment. Inspect the fire extinguisher for date of the last inspection and security of _________ installation.
Page 104 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 100 HOUR/ANNUAL INSPECTION GUIDE Inspect the collective sticks, torque tube assembly, control rods and bellcranks for excessively worn rod end bearings/bushings, and security of _________ installation. Inspect the collective spring capsule assembly for proper operation, _________ condition and security of installation.
Page 105 Check engine/post flight requirements in the Textron-Lycoming O, HO, AIO, HIO, TIO-360 Series Operator=s Manual. Run the aircraft I/A/W the Enstrom F-28F, 280F, or 280FX Rotorcraft Flight Manual. Check the engine instruments, fuel quantity and flow systems for proper operation. _________ UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev.
Page 106 Flight Control Check: Whenever disassembly of the flight controls, especially the removal of the main rotor hub, has been accomplished, it is recommended that a test flight be performed. See the Enstrom F-28F/280F Series Maintenance Manual for full details. _________ WARNING Test flight to be performed by authorized personnel only.
Page 107 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-52. 200 Hour Inspection Guide – Periodic Inspection AIRCRAFT REGISTRATION NUMBER: SIGNATURE: AIRCRAFT SERIAL NUMBER: DATE: HOURS: Engine: Flight: 200 HOUR INSPECTION GUIDE INITIAL INITIAL EACH ITEM AFTER ACCOMPLISHMENT 1. GENERAL INSPECTION Perform a complete 100 Hour/Annual Inspection.
Page 108 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-53. 400 Hour Inspection Guide – Periodic Inspection AIRCRAFT REGISTRATION NUMBER: SIGNATURE: AIRCRAFT SERIAL NUMBER: DATE: HOURS: Engine: Flight: 400 HOUR INSPECTION GUIDE INITIAL INITIAL EACH ITEM AFTER ACCOMPLISHMENT 1. GENERAL INSPECTION Perform a complete 100 Hour/Annual Inspection.
Page 109 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-54. Special Scheduled Inspection Guide – Periodic Inspection AIRCRAFT REGISTRATION NUMBER: SIGNATURE: AIRCRAFT SERIAL NUMBER: DATE: HOURS: Engine: Flight: SPECIAL SCHEDULED INSPECTION GUIDE INITIAL INITIAL EACH ITEM AFTER ACCOMPLISHMENT 1. MAIN ROTOR TRANSMISSION Retorque the aft pinion nut 20-25 hours after installation.
Page 110 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-55. Special Instructions 4-56. General Information – Special Instructions NOTE Refer to the applicable Textron-Lycoming Technical Publications for special inspections applicable to the engine. A. This section contains guidelines for performing the required inspections, by qualified...
Page 111 Remove the main rotor hub and inspect by liquid penetrant inspection and in accordance with the inspection tables in para. 9-1, D, or return to Enstrom Helicopter Corporation for inspection and overhaul/replacement. Inspect all flight control push-pull rods and torque tubes for sheared/damaged rivets at the fittings, damaged rod ends, or sheared/damaged roll pins.
Page 112 Inspect the tail rotor driveshafts for complete or partial failure at the taper pin holes. Inspect the taper pin hole in the main rotor transmission pinion for complete or partial failure. If damage is found, return the main rotor transmission to Enstrom Helicopter Corporation for overhaul/replacement.
Page 113 A. Overspeeds from 385-405 rpm for 5 seconds or less. No inspection required. NOTE If any damage is found, remove the main rotor hub and return to Enstrom Helicopter Corporation for inspection and overhaul/replacement. B. Overspeeds from 385-405 rpm for more than 5 seconds or overspeeds from 406-420 rpm.
Page 114 C. Overspeeds exceeding 420 rpm. Perform the following: Remove the main rotor hub and inspect by liquid penetrant inspection and in accordance with the inspection tables in para. 9-1, D, or return to Enstrom Helicopter Corporation for inspection and overhaul/replacement.
Page 115 If indications of a rough bearing are felt, the transmission must be replaced. NOTE If the gearbox is to be returned to Enstrom Service, do not clean the metal from the chip detector. If none of the above conditions are found, flush and service the transmission (main rotor, para.
Page 116 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-64. Engine Overspeed – Special Instruction A. Inspect the engine in accordance with the latest revision of Textron-Lycoming Service Bulletin 369. NOTE Perform the appropriate main rotor overspeed inspection if required. 4-65. Maintenance Ground Run A.
Page 117 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL D. Inspect rotor engagement for (1500 rpm idle): Smoothness of operation and positive over-center position (light) Proper clutch handle stowage Track of belt on idler roller E. Inspect the following instruments for “green” operation: Oil pressure...
Page 118 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-66. Ground Handling 4-67. Ground Handling Wheels A. Each skid tube is equipped with a manually operated ground handling wheel assembly. The ground handling wheels shall be in the raised position for flight or ground operations with the engine running and the rotor systems turning.
Page 119 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Remove lock pin from the ground handling wheel. With a steady motion, rotate wheel bar handle 180 towards the aft end of the aircraft and install lock pin when holes line up. Remove the wheel bar handle from the ground handling wheel lug.
Page 120 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-71. Hoisting (Figure 4-3) A. If the main rotor hub is installed, install the lifting sling (T-0011) so that the arms are between the pitch arm and the blade retention assembly, over the lead/lag retaining nut, and outboard of the main rotor damper rod-end.
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Page 122 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Using a soap and water solution and a soft cloth pad, wash a specific area using a circular motion. Flush the washed area immediately. Repeat steps c and d until the entire aircraft is clean.
Page 123 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-76. Aircraft Preservation and Storage 4-77. General – Aircraft Preservation and Storage A. Aircraft that see low usage or are stored for extended periods exhibit an accelerated rate of corrosion damage. Special attention should be given to aircraft inactive in a corrosive atmosphere (coastal, high humidity, air pollution, or sandy areas) to assure components remain in a serviceable condition.
Page 124 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Wash and wax the aircraft monthly to remove contaminants. G. Prior the next flight, complete the following: Remove all covers and tiedowns. Perform a preflight inspection. NOTE When inspecting oil levels, inspect for evidence of water contamination.
Page 125 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-80. Storage from 45 Days to 6 Months – Aircraft Preservation and Storage A. Complete steps A through C of paragraph 4-79. B. Remove the battery and store in a cool dry area. Clean the battery shelf if required (AC43.13-1B).
Page 126 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 4-82. Preventive Maintenance for Corrosion Control 4-83. General Information – Preventive Maintenance for Corrosion Control The airframe is fabricated of high strength aluminum and steel alloys and should be inspected regularly for signs of corrosion. Any areas where the protective finishes may have been scuffed, scratched, chipped, or worn off should be treated temporarily to control the onset of corrosive action.
Page 127 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Wash the aircraft with mild soap and fresh water weekly. NOTE Use a good quality paste wax. Wax the aircraft every second week. B. Aircraft that are operated in tropical or semi-tropical high humidity regions. Use the following procedures: Wash the aircraft with mild soap and fresh water weekly.
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Page 148 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL B. Battery – Troubleshooting Problem Cause Required Action Battery Loose or corroded Clean connections, tighten terminal discharged terminals hardware Loose belt Reference Section 6-3D Alternator Installation NOTE: Refer to Concorde RG Series Component Maintenance Manual, Document No.
Page 149 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 6-3. Alternator A. General Information The aircraft alternator is a belt driven type. The alternator output rating is 70 amperes continuous at approximately 12 volts D.C. or 28 volts D.C., depending on the electrical system. Principle components of the alternator are the stator, the rotor, the slip ring end head, the drive end head and the rectifier diodes.
Page 150 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL D. Alternator – Inspection Inspect the alternator I/A/W the manufacturer’s instructions. Inspect the alternator mount for corrosion, damage, and security. Check belt tension slip at 12-14 ft-lbs/16.3-19.0 Nm. NOTE: It is recommended that the service manual applicable to the alternator type be consulted for detailed repair procedures.
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Page 191: Table Of Contents
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SECTION 8 STRUCTURE TABLE OF CONTENTS Paragraph Description Page Table of Contents ..................MM-8-0 Cabin ......................MM-8-1 Removal ..................... MM-8-1 Inspection ................... MM-8-2 Repair ....................MM-8-2 Installation ..................MM-8-2 Windshields and Windows ..............MM-8-4 Inspection ................... MM-8-4 Repair ....................
Page 192: Table Of Contents
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SECTION 8 STRUCTURE TABLE OF CONTENTS Paragraph Description Page Skid Shoes Inspection ..................MM-8-23 Replacement ..................MM-8-23 Ground Handling Wheels Operational Description ..............MM-8-23 Removal ................... MM-8-23 Installation ..................MM-8-24 Oleo Struts Removal ................... MM-8-27 Disassembly ..................
Page 193 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SECTION 8 STRUCTURE TABLE OF CONTENTS Paragraph Description Page 8-14 Horizontal Stabilizers (F-28F Pre-1986) ..........MM-8-48 Removal ................... MM-8-48 Inspection ..................MM-8-48 Installation ..................MM-8-49 8-15 Horizontal Stabilizers (280F) ..............MM-8-49 Removal ................... MM-8-49 Inspection ..................MM-8-50 Installation ..................
Page 194: Uncontrolled Copy When Downloaded Or Printed Rev
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-0.3 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 195 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SECTION 8 STRUCTURE NOTE Section 22 content – supplemental maintenance procedures for models F-28F Post-1986 (S/N 744 and subsequent) and 280FX, has been incorporated into Section 8. Model or S/N effectivity is noted where applicable.
Page 196 C. Cabin Repair Replace damaged or missing hardware. Repair damage to the cabin shell, cockpit bulkhead, or the cockpit floor I/A/W AC 43.13-1B. Contact Enstrom Helicopter Corporation Customer Service for detailed damage and repair limitations. D. Cabin Installation Lift cabin and align with pylon mounts. Install the six attachment bolts. Torque bolts.
Page 197 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL NOTE: Some installations may be shimmed at point (B) bottom. Figure 8-1. Cabin Assembly Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-3 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 198 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Connect clutch cable at forward pylon mount and at turnbuckle in seat structure. Do a complete clutch cable rigging procedure. See Section 11-1. Connect all electrical wiring in the engine compartment. Connect all oil lines, fuel lines, and air speed static tube at firewall.
Page 199 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 8-2. F-28F Windshield UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-5 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 200 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Remove attachment screws around outer edge of windshield. Remove compass from windshield. Cut out and remove center portion of windshield. NOTE: When cutting center portion, stay approximately 2-3 inches away from cabin frame. Apply two layers of masking tape to cabin adjacent to windshield edge to protect paint.
Page 201 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Remove windshield. Clean fiberglass recess of cabin with acetone. Lightly sand bonding edge of windshield and clean with acetone. Apply bonding sealant PR-1425 B-2 (or equivalent) to recess in cabin frame using a putty knife. Spread adhesive approximately 1/8" to 3/16" thick.
Page 202 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL E. Windshield Removal (280F Series) (See Figure 8-3) NOTE: The 280F windshield consists of two pieces of plexiglass. Windshield halves can be replaced individually. Drill out rivets holding center strip in position and remove strip.
Page 203 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 8-3. 280F Series Windshield UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-9 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 204 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL CAUTION: Drill bits can be ground to a very sharp point to aid in drilling plexiglass. Use care in drilling to prevent cracking glass. Do not drill through inner fiberglass interior trim when drilling side and bottom of windshield.
Page 205 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL B. Overhead and Lower Window Installation (All F/FX) Clean recess in cabin with acetone or equivalent. Install double backing foam tape in position. Use 3M Brand tape #4016 (or equivalent), 3/4" wide x 1/16" thick.
Page 206 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 8-4. F-28F Cabin Door UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-12 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 207 Inspect the window and pop-out vent for condition, damage, and security. C. Door Repair (F-28F) Repair the door I/A/W AC 43.13-1B. Contact The Enstrom Helicopter Corporation Customer Service for detailed damage and repair limitations. Replace the seal strips around the door if deteriorated or damaged. Attach the new seal using trim adhesive 8031 (3M) or equivalent.
Page 208 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 8-5. 280F Series Cabin Door UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-14 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 209 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Remove foam strip from outer edge of door frame. Remove screws securing T-molding (8) and remove molding. Remove screws from door glass. Heat bonded area of plexiglass with a portable heat gun and remove glass from door frame.
Page 210 K. Door Glass Installation (280F Series) NOTE: Refer to the Enstrom Helicopter Corporation website, 280FX Technical Tips for replacing the door glass. Otherwise, the door should be returned to Enstrom Helicopter Service for glass replacement. UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev.
Page 211 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SEAT BELTS – LAP TYPE A. Seat Belt Removal Remove seat cushions. Disconnect attachment end of belts by applying pressure to the spring loaded "latch", opening it sufficiently to clear the structural attach point as it is lifted.
Page 212 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Left seat position - install as follows: (a) Attach seat belt half with release mechanism to left rear cabin wall structural attach point. See Figure 8-6, Point "A". (b) Attach seat belt half with flat tab to structural attach point right of left center seat beam.
Page 213 (SDB 0126). C. Seat Structure Repair Replace damaged or missing hardware. Repair damage to the structure I/A/W AC 43.13-1B. Contact The Enstrom Helicopter Corporation Customer Service for detailed damage and repair limitations. D. Seat Deck Installation Install fiberglass seat deck over clutch engagement lever and into position.
Page 214 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 8-7. Landing Gear to Pylon Attachment UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-20 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 215 (b) Landing Gear Legs and Drag Struts: Landing gear legs and drag struts that are bent, bowed, or cracked may be repaired I/A/W AC 43.13-1B. Contact The Enstrom Helicopter Corporation Customer Service for detailed damage and repair limitations. Replace landing gear legs and drag struts with elongated bolt holes.
Page 216 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 8-8. Landing Gear Assembly Breakdown UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-22 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 217: Skid Shoes
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL B. Skid Shoes Inspection Inspect the skid shoes for cracked or torn mounting straps and for excessive wear Skid Shoes Replacement (See Figure 8-8) (a) Skid shoes may be replaced by one of the following methods: Jack up landing gear.
Page 218 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL (b) Rotate retaining pin ring up from the axle assembly. Remove snap ring (7) and washer (6) from outboard end of axle (4). Pull pin (5) and slide wheel and axle assembly from mount bracket.
Page 219 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 8-9. Ground Handling Wheel Operation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-25 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 220 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 8-10. Ground Handling Wheel Removal and Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-26 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 221: Oleo Struts
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL D. Oleo Struts Oleo Strut Removal (See Figure 8-11) NOTE: The weight of the aircraft must be removed from oleo struts before strut removal can be accomplished. Install sling T-0011 on main rotor hub and hoist entire helicopter.
Page 222 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Disassemble valve assembly (13), if required, as follows: (Figure 8-12, View B) NOTE: Do not disassemble this unit unless damage or wear has occurred to valve (19). Remove nuts (15) and washers (16). Remove valve pistons (17) and valve springs (18) from shaft (20).
Page 223 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 8-11. Oleo Strut Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-29 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 224 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 8-12. Oleo Strut Assembly UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-30 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 225 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-31 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 226 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 228 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL (b) Assemble the guide shaft assembly (6) as follows: Press brass guide (5) into position if previously removed Install felt wiper (4) into the brass guide (5). Install O-ring (7) on the O.D. of the guide shaft (threaded end).
Page 229 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL NOTE: The piston must be inserted into the cylinder assembly slowly to allow the hydraulic fluid to work through the staggered notches of the rebound rings and the flow passage in the piston assembly. (k) Install the piston and guide shaft assembly into the cylinder assembly. Slowly push the piston to the base of cylinder assembly (collapsed position).
Page 230 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Oleo Strut – Installation (see Figure 8-11) NOTE: Helicopter must be jacked or hoisted with a sling for oleo strut installation. (a) Place a light washer (2) on each side of universal link (1) and install between mount ears on oleo strut (2 places).
Page 231: Inspection
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL E. Landing Gear Fairings (280FX) 280FX models are equipped with landing gear fairings on the oleo struts and landing gear legs. These fairings are made of aluminum and fiberglass and are clamped onto the landing gear assembly.
Page 232: Assembly - After Oleo Replacement
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Assembly – After Oleo Replacement (a) Reverse procedures in paragraph 2 and paragraph 1. (b) Check for proper security. Figure 8-12.1. Landing Gear Fairings (280FX) UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-38 Sep 20/17...
Page 233: Pylon
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 8-10 Pylon A. Pylon Removal and Installation The pylon assembly supports all major structural and drive train components of the helicopter. The removal and installation of the pylon is accomplished by completing the removal and...
Page 234 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 8-13. Baggage Compartment Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-40 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 235: Repair
Replace damaged or missing hardware. Repair damage to the baggage compartment shelf, bulkheads, or the mounting brackets I/A/W AC 43.13-1B. Contact The Enstrom Helicopter Corporation Customer Service for detailed damage and repair limitations. D. Baggage Compartment Installation (See Figure 8-13) Slide baggage compartment into pylon structure.
Page 236: Inspection
Inspect the tailcone for buckling, corrosion, cracks, dents, and working rivets. C. Tailcone Repair Repair damage to the tailcone I/A/W AC 43.13-1B. Contact The Enstrom Helicopter Corporation Customer Service for detailed damage and repair limitations. D. Tailcone Installation (See Figure 8-14) NOTE: Realignment is required for a new tailcone installation.
Page 237 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 8-14. Tailcone Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-43 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 238 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL NOTE: Tailcone installation requires a person at the aft end to support the tailcone and two people on the forward end to lift and align the tailcone to the pylon. Connect previously routed strings to tail rotor cables (3) and pull cables back through fair leads to aft end of tailcone.
Page 239: Inspection
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL C. Tail Rotor Guard Installation Position tail rotor guard in forward upper fitting and install bolt (23) and hardware. Install clamp (12) and bolt (13) with associated hardware. Position aft tail rotor guard fitting into tail rotor gear box and install bolt (16) with required hardware, torque all three bolts (13), (16) and (23).
Page 240: Repair
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 8-13 TORQUE TUBE EXTENSION A. Torque Tube Removal (See Figure 8-15) Disconnect the tail rotor cables and remove the tail rotor assembly and gearbox. See Section 10-5, Tail Rotor Gearbox Removal NOTE: The tail rotor assembly and gearbox can be removed as a unit.
Page 241 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 8-14.1 Tail Rotor Driveshaft Cover (280 FX) Figure 8-15. Torque Tube Extension UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-47 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 242: Horizontal Stabilizers (F-28F Pre-1986
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL D. Torque Tube Extension Installation Apply Lubriplate 630-AA (MIL-PRF-81322) to the forward end of torque tube (6) and slide tube into tailcone mount. Install bolts (4) through the mount and into the torque tube. Tighten bolts.
Page 243 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL B. Stabilizer Inspection (F-28F) Inspect in accordance with Table 8-2. NOTE: If either stabilizer requires replacement, it shall be necessary to install a new spar, as stabilizers are match-drilled to spar on installation. C. Stabilizer Installation (F-28F) (See Figure 8-16) Apply lubriplate or equivalent to the spar (3) and slide the spar into the tailcone spar mounts.
Page 244: Removal
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Remove bolts (2) securing stabilizer to spar. Slide stabilizer off of spar to remove. Separate strobe wires at quick disconnect points to allow complete removal. B. Stabilizer Inspection (280F) Inspect in accordance with Table 8-3.
Page 245 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL B. Stabilizer Inspection NOTE: If either stabilizer requires replacement, it shall be necessary to install a new spar, as the stabilizers are match-drilled to the spar on installation. Inspect in accordance with Table 8-4. C. Stabilizer Installation Apply Lubriplate 630-AA (MIL-PRF-81322) to the spar (3) and slide the spar into the tail cone spar mounts.
Page 246 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-52 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 253: Installation
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 8-17 AIRSCOOP (280FX) The airscoop comprises three separate pieces which are fiberglass construction. These include a nose piece which is attached to the cabin roof, a center duct which is mounted to the top of the fuel tanks, and a large airscoop which is mounted on the wraparound cowl behind the trans-mission.
Page 254 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 8-19. Three-Piece Airscoop (280FX) UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-8-60 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 255 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 9-1. MAIN ROTOR ASSEMBLY General Information The main rotor system is a three bladed, high inertia, fully articulated rotor system. The main rotor hub assembly is comprised of two opposing forged aluminum hub plates separated by an aluminum cylindrical spacer.
Page 256 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Install the hoist sling (T-0011) so the arms are between the pitch arm and the blade retention assembly, over the lead/lag retaining nut, and outboard of the main rotor damper rod-end. The sling arms are long enough to be double wrapped, if preferred (Figure 4-3).
Page 257 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL NOTE: If shims are installed behind DU washers, remove and save for reassembly. NOTE: For retention disassembly, see Section 9-2, Retention Disassembly. Remove bolts (1) and (2) from the walking beam brackets (3) and remove the brackets (Figure 9-3).
Page 258 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 9-1. Pitch Link Attachment to Pitch Arm Figure 9-2. Walking Beam Removal and Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 7 MM-9-4 Aug 22/16 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 259 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Bolt Lock Key Grease Fitting Bolt Bolt Grease Fitting Bracket Upper Spline Adapter Stop Pad Dust Cover Dowel Pin Bearing Retaining Nut Upper Hub Plate DU Washer Lock Washer Universal Block Spacer DU Washer Center Spacer...
Page 260 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL NOTE: One shim P/N 28-14019-5 (Item 2) is installed, either the left or right side of the universal block. DU Washer Lock Washer Shim Flapping Hinge Pin Retention Assembly Figure 9-4. Retention Assembly Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev.
Page 261 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Inboard Pivot Bolt Washer Chamfered Washer Washer Cotter Pin Spacer Bolt Figure 9-5. Damper Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 7 MM-9-7 Aug 22/16 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 262 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 9-6. Flapping Bearing and Spindle Dimension Check Figure 9-7a. “Forward” Flapping Bearing Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 7 MM-9-8 Aug 22/16 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 263 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 9-7b. “Aft” Flapping Bearing and Spacer Installation Figure 9-7c. Flapping Bearing Installation Alignment Tool UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 7 MM-9-9 Aug 22/16 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 269 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 9-2. RETENTION ASSEMBLY – Disassembly and Inspection Disassembly (Figure 9-8) Clamp the retention assembly in a vise in a vertical position. CAUTION: Use brass protector plates on the vise jaws to prevent damage to spindle surface Remove hardware from the dust cover (18) and remove cover.
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Page 274 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 9-3. UNIVERSAL BLOCK ASSEMBLY Universal Block - Disassembly (Figure 9-3) Remove upper and lower bearings (22) and DU washers (23) from U-block (15). Press flapping bearings (22), spacer (24), and shims (25) from bore of U-block.
Page 275 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 9-4. RETENTION ASSEMBLY - Assembly Assembly (See Figure 9-8) If installing new retention stops (1) and (4) proceed as follows: Clean blocks (1) and (4) and spindle (3) with acetone or equivalent. Apply adhesive (DP 420 or equivalent) to bonding surface of the stop and install the stop into position on the spindle.
Page 276 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL (14) Remove tool T-0036 and tap blade grip down until fully seated. (15) Install the nylatron strap (5) inside the lamiflex bearing (14). Ensure that the ends of the nylatron do not overlap. (16) Install lamiflex bearing (14) while aligning tabs to slots in spindle and blade grip.
Page 277 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Droop Stop O-Ring Dust Cap Blade Grip Spindle Lamiflex Bearing Flapping Stop Shim Nylatron Strap Retaining Nut Seal Cotter Pin Bearing Dust Cover Spacer Blade Retention Pin Bearing Drag Link Retaining Ring Pitch Horn DU Washer Figure 9-8.
Page 278 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 9-9. Lamiflex Bearing Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 7 MM-9-24 Aug 22/16 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 279 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Main Rotor Hub – Assembly (See Figure 9-3) WARNING: Use extreme caution when removing or installing the blade and grip assemblies to prevent from injuring personnel. WARNING: Use protective gloves when handling heated parts. NOTE: The upper hub plate has helicoil inserts in the outer bosses for the walking beam mount brackets.
Page 280 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Insert bolts in upper spline adapter (12) as guides and install spline adapter into upper hub plate (14). NOTE: To distinguish between spline adapters, the upper spline adapter (12) has the wider flat surface on top side of splines while the lower spline adapter has a rib extending from lower end of spline.
Page 281 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Torque nut (5) to 20 ft-lbs/27.1 Nm using tool T-0051-3. Using a plastic mallet, tap down on top of nut and re-torque to seat upper bearing. NOTE: Repeat step (c) until nut (5) will not move when being torqued to 20 ft- lbs/27.1 Nm.
Page 282 Carefully slide the retention assembly into position over the DU washer and U-block. NOTE: Enstrom recommends replacing Flapping Hinge Pin, P/N 28-14233-1, with Flapping Hinge Pin, P/N 28-14233-3, when reinstalling the main rotor retention assemblies after the flapping bearings have been shimmed.
Page 283 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL CAUTION: Do not proceed unless the universal block has been assembled (shimmed) in accordance with paragraph 9-3, C. Check the flapping bearing drag resistance at the blade pin. Initially, the grip should not stay up. Add shim thickness in 0.005 inch increments to achieve sufficient resistance to hold the grip in the up-stop position at 150 ft-lbs/203.4 Nm.
Page 284 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 9-10 [Deleted] UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 7 MM-9-30 Aug 22/16 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 285 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Damper – Installation (1) Remove cotter pin and nut from center walking beam bolt. Slide bolt back to end of threads. (2) Install damper assembly on main rotor hub. (3) Install chamfered washer on inboard damper bolt.
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Page 316 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 9-10. Repair – Main Rotor Blades A. Repair small areas of the paint finish using the following: NOTE Refinish the blades equally if refinishing a larger area (outboard leading edge for example) to maintain the continuity of the weight between the blades.
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Page 318 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL NOTE Main rotor blades with intergranular spar corrosion (exfoliation) exceeding the limits of Figure 9-19 must be rejected as unairworthy. D. Repair voids in the spar to skin bond lines that do not exceed the limits of Figure 9-20...
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Page 329 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL WARNING Use the proper protective equipment when working with the chemical conversion coating. Observe the precautionary information and instructions provided with the chemical conversion coating. Treat the blade as required with a chemical conversion coating complying with MIL- DTL-5541/MIL-DTL-81706.
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Page 343 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL H. Static Balance Procedure – See Section 10-2. NOTE: Complete the static balance procedure before installing the tail rotor on helicopter. Pitch Link Inspection, Repair, Assembly and Installation NOTE: Pitch change links P/N 28-16345-11 or P/N 28-16391-1 must be installed as same part number pairs (either two P/N 28-16345-11 or two P/N 28-16391-1).
Page 344 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Connect the outboard hand thread rod ends to the pitch arms with the hardware in the following sequence: bolt (1) (bolt head installed in direction of rotation), Harper washer (8), thin spacer (9), O-ring (11), pitch change link rod end (4) (see Note above), thick spacer (10), AN960-416 washer (5), pitch arm, washer(s) (5) (use stack-up retained in para.
Page 345 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 10-2. Tail Rotor Pitch Change Link Installation Bolt Cotter Pin Washer Harper Washer Spacer Spacer Pitch Change Link Rod End Spacer Washer O-ring Pitch Change Link (28-16391-3 shown) Figure 10-3. P/N 28-16391-3 Pitch Change Link Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev.
Page 346 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 10-4. Tail Rotor Pitch Change Link UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 6 MM-10-14.2 Apr 7/15 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 357 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 10-11 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED MM-10-25 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 358 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 10-4 Pitch Control Assembly Pitch Control – Removal (See Figure 10-12) Disconnect pitch links from pitch link retainer (13). Remove tail rotor assembly. (See Section 10-1) Remove cotter pin, nut, and pivot bolts from pitch control and control brackets.
Page 359 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 10-12. Tail Rotor Slider Assembly Figure 10-13 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 7 MM-10-27 Aug 22/16 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 362 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL D. Pitch Control – Assembly (See Figure 10-12) Heat bearing housing (7) and install bearing (8). NOTE: Bearing (8) is installed with slots for removal of inner bearing section facing outboard toward pitch link retainer. These slots are located 90° to pivot arms of bearing housing (7) on installation.
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Page 373 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 10-21 Figure 10-22 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 7 MM-10-41 Aug 22/16 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 374 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Drill aft coupling as follows: (see Figure 10-21) Mark a line on driveshaft 7/8" from end of shaft. Slide coupling on shaft until even with 7/8" line. Mark and center-punch Point "A" of Figure 10-21 using dimensions given.
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Page 377 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 10-7 TAIL ROTOR CABLES Tail Rotor Cable – Inspection Remove wraparound cowling and baggage box. Remove seat cushions and fiberglass seat deck. Inspect cables for wear, strand separations and fraying. Visually inspect cable pulleys for wear and security.
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Page 380: Installation
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL (m) Using a cable tensiometer, adjust turnbuckles until cables read 35 to 40 lbs. The cable tension must be within ±1 lb from left to right cable after installation. NOTE: The two cables must have equal tension. Adjust inboard cable first.
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Page 403 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Belt Rib Surface Rib cracking is a normal occurrence on the belt and is caused primarily by the reverse bend idler. The cracks normally extend to the base of the rib and go no further. Numerous cracks of this type are not significant. The belt should be examined for cracks which have extended below the base of the ribs and, if this has occurred, the belt should be removed.
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Page 407 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL C. Gearbox – Installation Install main rotor hub on gearbox. See Section 9-1-B for hub installation procedure. CAUTION: Hub must be installed with index marks on spline adapters aligned to properly phased spine on rotor shaft, or serious flight control problems will result.
Page 408 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL (14) Service gearbox with oil. See Section 5, Servicing and General Maintenance, for approved oil and quantity required. (15) Check all connections for security. (16) Install main rotor blades. (17) Track drive belt. See Sections 11-5-E and 11-6-B, Belt Drive System, for installation and tracking procedure.
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Page 414 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL (2) Jackstrut Bearing Housing Assembly Press bearing adaptor (4) into bearing (5). Heat bearing housing (6) to approximately 250 °F (121 °C). Lubricate O.D. of beaing (5) and drop into housing (6). The adapter (4) should be facing aft toward housing mount area.
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Page 434 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL (18) Install cotter pin in forward actuator arm pivot bolt. (19) Safety wire two of the three mount bolts attaching forward actuator arm to yoke (15) with 0.032 wire. (20) Install locking key (19) into nut (20) and into slot on rod end (21) (see Fig.
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Page 447 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL G. Spring Capsule – Assemble (See Figure 11-18) (1) Press anchor (14) on spring housing (13) while aligning holes for shaft (15). NOTE: Anchor (14) will be installed with ear of anchor in line with center end cap screw (12).
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Page 533 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL 1. Engine pressure fitting; restricted fitting required. (Refer to Para. 13-2, D., (3), (b) and SDB 0123) 2. Restricted turbo outlet fitting 3. Engine temperature probe fitting location 4. Chamfered case plug location 5. Check...
Page 534 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL C. Engine – Removal (1) Install lifting ring; attach at third case half the bolt from the accessory case. (2) Support the weight of the engine with the lifting device. (3) Remove the four mount bolts and mount assemblies.
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Page 536 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Transfer restricted oil pressure fitting (P/N ECD110-11) (Fig 13-1, Ref. 1) (see also SDB 0123). Transfer restricted oil feed fitting to turbo (Ref. 2, Fig 13-1). Transfer oil return line fitting from scavenge pump (Ref. 8, Fig. 13-1).
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Page 538 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Engine – Installation (1) Place engine in position under the pylon and attach lifting device. (2) Raise engine into pylon, tilting as necessary to insure accessories are not damaged. (3) Install serviceable mounts and bolts with one to three AN 960-716 washers under the nuts.
Page 539 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL (21) Install sump drain valves, three places. (22) Install bay tubes and fuel filter. (23) Connect fuel lines to filter. (24) Install induction tube to engine. (25) Install induction air line from fuel pump to induction tube.
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Page 541 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Check exhaust system flanges and gaskets and install exhaust system. Install engine side baffling. Install ignition wires. Install static air manifold, safety wire screws in pairs. Install flow divider fuel line clamp. (10) Install nozzle and connect fuel and static air lines.
Page 542 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL C. Exhaust Manifold – Inspection Upon removal of the complete exhaust system, check the flange mounting of each exhaust stack for cracks, distortion of the flange and proper gaskets. WARNING: At the 100-hour inspection it will be necessary to remove the cabin heat exchanger cover to inspect for any cracks internally which could allow carbon monoxide to enter the cabin through the heating system.
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Page 544 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 13-3. Engine Exhaust System and Wastegate UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 7 MM-13-22 Aug 22/16 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 545 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Wastegate – Installation (See Fig. 13-3) Place wastegate in position on exhaust manifold. Install exhaust outlet, gasket and clamp on turbocharger and wastegate. Torque clamp to 20 in-lbs and safety wire. NOTE: Later versions of wastegate installations no longer use the stainless band clamp.
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Page 555 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 13-5. Fuel Servo Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 7 MM-13-33 Aug 22/16 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 560 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 13-6. Mixture Control Rigging UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 7 MM-13-38 Aug 22/16 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 562 NOTE: To facilitate removal and cleaning of the fuel injection servo finger screen, Enstrom recommends upgrading the AMC shroud to the latest configuration (P/N 28-181007-5), if not previously installed. UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev.
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Page 570 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL (11) Slide turbocharger up and off the mount brackets to remove turbo and adapter gasket from the aircarft. (12) Cover openings at injector, induction tube and exhaust system to prevent contamination. (13) Remove injector inlet adapter and gasket from turbocharger.
Page 571 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Connect exhaust collar and steel gasket to the turbocharger exhaust inlet. Rotate the collar for correct alignment. Install exhaust inlet clamp, torque to 70-80 in-lb/7.9-9.0 Nm and safety. NOTE: Slip clamp over end of tube to assemble. Do not spread.
Page 572 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 13-9. Turbocharger Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-13-50 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 583 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL (2) Fan Shroud – Installation Position fan shroud in engine compartment and loosely attach it to the top engine bracket and side baffling. Temporarily install the fan to align shroud and tighten fasteners. Install air deflection vanes.
Page 584 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL (d) Install tape and cut finishing end to match. CAUTION: Upon initial running of the engine, it is necessary to clean oil cooler air passages of foam tape particles sheared off by the fan. D. Firewall Repairs (See Fig. 13-14) NOTE: All openings in the firewall in excess of 1/32 inch are to be repaired.
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Page 593 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 13-16. Ignition Wire Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 MM-13-71 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 599 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Connect vent lines (2) at top of tanks. NOTE: Excessive deviation between fluid level and gauge reading is cause for replacement of the sending unit. Place aircraft in ground attitude, ground handling wheel retracted. Add five gallons of fuel to each tank.
Page 600 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL (b) Sending Unit – Installation (See Fig. 13-19) Replace seal (7) around fuel tank opening, if damaged. NOTE: Seal is secured in place with 3M brand Trim Adhesive, P/N 08021, or equivalent. Install sending unit (1) into fuel tank.
Page 601 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Open all openings and force ventilate tank to cure slushing compound. NOTE: Allow a minimum of eight hours cure time. (Slushing com-pound is tack-free when cured.) Install main fuel outlet and strainer, adding a new bond of PR1440 B-2 fuel tank sealant (PPG PRC DeSoto).
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Page 623 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 13-24. Aft Cable Attach Point UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 MM-13-101 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 624 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 13-25. Correlator Idle Stop Position UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED MM-13-102 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 625 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 13-26. Fuel Servo Throttle Bellcrank UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 MM-13-103 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 626 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 13-27. Override Stop Adjustment UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED MM-13-104 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 627 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 13-28. Fuel Servo with Tool No. T-0113 Installed UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 MM-13-105 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 628 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 13-29. Correlator Full Throttle Stop Position UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED MM-13-106 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 629 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL Figure 13-30. Fuel Servo Full Throttle Position UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 MM-13-107 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 630 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 MM-13-108 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 635 This maintenance manual supplement sets forth the recommendations and procedures for maintaining and servicing the Model 280FX and 1986 F-28F helicopter, manufactured by the Enstrom Helicopter Corporation. This Supplement must be used in conjunction with the Model F-28F and 280F Series Maintenance Manual. The procedures in this manual supersede any conflicting procedures listed in the earlier manuals and/or supplements.
Page 636 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-15-2 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 637 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT SECTION 16 [RESERVED] UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-16-1 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 649 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT SECTION 21 ELECTRICAL SYSTEMS AND COMPONENTS 21-1. General – Reference Section 6 for Other Information The electrical system of the 280FX and F-28F is essentially the same as the system used on the 280F except for the changes listed below: ...
Page 650 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Anti-Collision and Navigation Light System Figure 21-1 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 4 MM-21-2 Jun 21/12 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 651 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Lamp Replacement – Annunciator Panel Each indicator light contains two lamps. These lamps can be replaced as follows: Press inward on the right edge of the indicator until indicator opens. Swing indicator fully open.
Page 652 The position of the magnetic sensor was set at the factory and will need no readjustment. Contact Enstrom Product Support for service on the magnetic sensor. For electrical schematic see Diagram 21-4, for RPM adjustment on low rotor indicator see Figure 21-2.
Page 653 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Low Rotor RPM Indicator Adjustment (F-28F S/N 830 and prior; 280FX S/N 2136 and prior) Figure 21-2 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 4 MM-21-5 Jun 21/12 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 654 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT 21-4. Anticollision and Navigation Light and Annunciator Panel Troubleshooting Chart PROBABLE CAUSE REQUIRED ACTION Anti-collision lights both out with master on and anti-collision light switch on: Circuit breaker tripped Reset circuit breaker. Check for wire shorted to ground.
Page 655 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT PROBABLE CAUSE REQUIRED ACTION One indicator is dim when “press-to-test” is pressed: One lamp burned out Replace lamp. If no change, reinstall first lamp and replace second lamp. Low rotor rpm circuit, including horn, doesn’t work:...
Page 656 280FX (S/N 2135 and subsequent) electrical load analysis tables are omitted from this manual but are documented and maintained with the build records for each aircraft manufactured. Contact Enstrom Product Support to inquire about the ampere load conditions for your aircraft.
Page 657 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Table 21-1. 280FX Flight Ampere Load Conditions NOTE: The information in this table applies to early production (see paragraph 21-6 NOTE). ELECTRICAL DEVICE NIGHT Boost Pump Longitudinal Trim Lateral Trim Radio, Transmit Radio, Receive...
Page 658 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Table 21-2. F-28F/280FX Flight Ampere Load Conditions – 28 Volt System NOTE: The information in this table applies to early production (see paragraph 21-6 NOTE). ELECTRICAL DEVICE NIGHT Nav Lights @ 0.805 amps ea 3.22...
Page 659 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT 21-7. Hi/Lo Rotor RPM Warning System The Hi/Lo Rotor RPM Warning System consists of the P/N ECD4079-1 Hi/Lo Rotor RPM switch (signal conditioning unit), a ROTOR RPM warning light, a magnetic sensor, microswitches (S19 and S24), a lamp test switch (S25), warning horn, and a warning tone generator interfaced with the audio panel.
Page 660 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT The signal conditioning unit has been adjusted at the factory to activate at rotor speeds below 332 RPM or above 385 RPM. The unit should not need readjustment, but if it does, the operator may adjust the LO or HI potentiometers located on the top of the unit.
Page 661 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Run up the aircraft in accordance with the operator’s manual. Check the CLUTCH ENGAGE warning light extinguishes and the ROTOR RPM light illuminates when the clutch is engaged. Increase the power to bring rotor up to 334 rpm and check the ROTOR RPM warning light extinguishes at 333 ±...
Page 662 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT 21-8. Schematic Diagrams Table 21-3. List of Diagrams Diagram 21-1. 12 Volt Power Distribution – 280FX Diagram 21-2. 12 Volt Power Distribution – F-28F Diagram 21-3. 24 Volt Power Distribution – F-28F and 280FX Diagram 21-4.
Page 663 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Diagram 21-1 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 4 MM-21-15 Jun 21/12 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 664 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Diagram 21-2 Rev. 4 MM-21-16 Jun 21/12 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 665 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Diagram 21-3 Rev. 4, Jun 21/12 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED MM-21-17/MM-21-18 Blank Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 667 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Annunciator Panel Schematic (F-28F, S/N 830 and prior; 280FX, S/N 2135) Diagram 21-4 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 5 MM-21-19 Nov 5/13 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 668 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 4 MM-21-20 Jun 21/12 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 669 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Diagram 21-5. 24 Volt Electrical System Schematic (F-28F, S/N 831 and subsequent; 280FX, S/N 2136 and subsequent) Sheet 1 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8, Sep 20/17 MM-21-21/MM-21-22 Blank Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 671 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Diagram 21-5. 24 Volt Electrical System Schematic (F-28F, S/N 831 and subsequent; 280FX, S/N 2136 and subsequent) Sheet 2 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8, Sep 20/17 MM-21-23/MM-21-24 Blank Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 673 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Diagram 21-5. 24 Volt Electrical System Schematic (F-28F, S/N 831 and subsequent; 280FX, S/N 2136 and subsequent) Sheet 3 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8, Sep 20/17 MM-21-25/MM-21-26 Blank Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 675 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Diagram 21-5. 24 Volt Electrical System Schematic – Cyclic Grip (F-28F, S/N 831 and subsequent; 280FX, S/N 2136 and subsequent) Sheet 4 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-21-27 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 676 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Diagram 21-5. 24 Volt Electrical System Schematic – Trim Switch Modules (F-28F, S/N 831 and subsequent; 280FX, S/N 2136 and subsequent) Sheet 5 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-21-28 Sep 20/17...
Page 677 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Diagram 21-5. 24 Volt Electrical System Schematic – EDM-700 (F-28F, S/N 831 and subsequent; 280FX, S/N 2140 and subsequent) Sheet 6 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8, Sep 20/17 MM-21-29/MM-21-30 Blank Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 679 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Diagram 21-5. LED Position Light Schematic (F-28F, S/N 833 and subsequent; 280FX, S/N 2148 and subsequent) Sheet 7 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-21-31 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 680 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT INTENTIONALLY LEFT BLANK Rev. 8 MM-21-32 Sep 20/17 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 681 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT SECTION 22 [RESERVED] UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-22-1 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
Page 682 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Rev. 8 MM-22-2 Sep 20/17 Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
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Page 685 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT SECTION 24 INSTRUMENTS 24-1. Engine Monitor 24-2. Description – Engine Monitor Later F-28F and all 280FX production aircraft are equipped with an engine monitor as an aid for fuel mixture leaning in cruising flight. The engine monitor replaces the turbocharger inlet temperature gauge (analog indicator) used in 280F and early F-28F production aircraft.
Page 686 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT 24-3. Maintenance – Engine Monitor The engine monitor instrument requires no scheduled maintenance checks, calibration, field adjustments or field-serviceable components. Built-in self-tests start automatically on power-up to detect instrument malfunctions. Common start-up malfunctions are caused by a wiring anomaly.
Page 687 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Table 24-2. Graphic Engine Monitor Troubleshooting Problem Cause Required Action Gradual or sudden increase in Partially plugged fuel nozzle, Remove and clean indicated EGT of one cylinder. indicated by no variation in cylinder nozzle.
Page 688 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Problem Cause Required Action Above normal temperatures in Cracked, missing or open Repair or replace baffles, remove one or more cylinders (CHT). baffles or doors. Obstruction or obstructions, and close panel doors. debris in cylinder fins. Cowl EDM-700 panel doors not secure.
Page 689 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT Problem Cause Required Action Decline in EGT uniformity, most Fuel system restriction or dirty Clean fuel nozzles. Do flow check visible at cruise power settings. injection nozzles. for uniformity, and if problem persists check fuel system for EDM-700 proper pressure and flow.
Page 690 ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT NOTE: Instrument panel layouts may vary depending on customer preferences. Airspeed Indicator Ammeter Rotor and Engine Tachometer Engine Oil Pressure Indicator (Dual Tach) Engine Oil Temperature Indicator Manifold/Fuel Pressure Indicator Cylinder Head Temperature Indicator...
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This manual is also suitable for:

280f series 280fx series