Page 1: General Information
NOTICE The instructions set forth in this manual, as supplemented or modified by Alert Service Bulletins (ASB) or other directions issued by Bell Helicopter Textron Inc. and Airworthiness Directives (AD) issued by the applicable regulatory agencies, shall be strictly followed.
Page 2 BHT-412-MM-1 PROPRIETARY RIGHTS NOTICE These data are proprietary to Bell Helicopter Textron Inc. Disclosure, reproduction, or use of these data for any purpose other than helicopter operation or maintenance is forbidden without prior written authorization from Bell Helicopter Textron Inc.
Page 3 BHT-412-MM-1 WARNING THIS MANUAL APPLIES ONLY TO HELICOPTERS AND COMPONENTS MAINTAINED IN ACCORDANCE WITH BELL HELICOPTER TEXTRON (BELL) APPROVED PROCEDURES USING BELL APPROVED PARTS. ALL INSPECTION, REPAIR AND OVERHAUL PROCEDURES PUBLISHED BY BELL, INCLUDING PART RETIREMENT LIFE, ARE BASED SOLELY ON THE USE OF BELL PARTS THAT HAVE BEEN MAINTAINED USING BELL APPROVED DATA.
Page 4 BHT-412-MM-1 CUSTOMER SUPPORT AND SERVICES Flying smart means that no matter where you are, or what time it is, you can make a call and get additional information, clarification, or advice on a technical or operational issue concerning your helicopter or information contained in our Technical Publications. Product Support Engineering (PSE) is just a phone call away and may be contacted as follows: Model 206, 505, or 407...
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Page 7 CUSTOMER FEEDBACK Return by fax to Product Support Engineering (450) 433-0272, e-mail to publications@bellflight.com, or mail to the address on the next page. Manual Title: Manual Number (if assigned): Date of Issue: Date of Last Revision: Section, Chapter, Paragraph Affected: Your Feedback: Now Reads: Should Read:...
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Page 11 BHT-412-MM-1 SPARE PARTS WARRANTY ONE YEAR/1,000 HOURS PRORATED WARRANTY AND REMEDY: Seller warrants each new helicopter part or helicopter part reconditioned by seller to be free from defect in material and workmanship under normal use and service and if installed on Bell model helicopters. Seller’s sole obligation under this warranty is limited to replacement or repair of parts which are determined to Seller’s reasonable satisfaction to have been defective with 1,000 hours of operation or one (1) year after installation, whichever occurs first and reimbursement of reasonable freight charges.
Page 13 FAA APPROVED BHT-412-MM-2 CHAPTER 4 — AIRWORTHINESS LIMITATIONS SCHEDULE TABLE OF CONTENTS Paragraph Chapter/Section Page Number Title Number Number AIRWORTHINESS LIMITATIONS SCHEDULE Airworthiness Limitations Schedule ..........4-00-00 FIGURES Figure Page Number Title Number Longitudinal/Lateral CG Envelope for Hoist Operations ........TABLES Table Page...
Page 14 BHT-412-MM-2 FAA APPROVED REVISION DATE OF SIGNATURE FAA/ODA* SIGNATURE Original 1 January 1981 15 May 1981 15 November 1981 24 February 1982 9 November 1982 9 December 1982 31 March 1983 20 October 1983 30 July 1984 19 November 1984 3 June 1987 4-00-00 Page 2...
Page 15: Sep 2016 Rev.
FAA APPROVED BHT-412-MM-2 REVISION DATE OF SIGNATURE FAA/ODA* SIGNATURE Reissue 29 March 1990 20 February 1991 Reissue Reissue 23 June 1994 12 April 1995 1 October 2002 30 March 2007 27 February 2009 4-00-00 Export Classification C, ECCN EAR99 15 SEP 2016 Rev. 24 Page 3...
Page 16 BHT-412-MM-2 FAA APPROVED REVISION DATE OF SIGNATURE FAA/ODA* SIGNATURE 1 May 2012 26 March 2013 15 September 2016 14 June 2018 25 SEP 2018 4-00-00 Page 4 Rev. 27 25 SEP 2018 Export Classification C, ECCN EAR99...
Page 17 FAA APPROVED BHT-412-MM-2 AIRWORTHINESS LIMITATIONS SCHEDULE 4-1. AIRWORTHINESS LIMITATIONS COMPONENT PAST ITS STATED LIMITS SCHEDULE I S N O T P E R M I T T E D A S I T C O U L D S E R I O U S LY A F F E C T T H E The Airworthiness Limitations section is FAA approved...
Page 18 BHT-412-MM-2 FAA APPROVED APPLICABLE SERVICE INSTRUCTION ( S I ) O R M A I N T E N A N C E M A N U A L WARNING S U P P L E M E N T ( M M S ) F O R K I T...
Page 19 FAA APPROVED BHT-412-MM-2 Table 4-1. Airworthiness Limitations Schedule (Cont) NOMENCLATURE PART NUMBER AIRWORTHINESS LIFE MAIN ROTOR HUB (CONT) Pitch Horn Assembly 412-010-149-105 5000 hours Pitch Horn Assembly 412-010-149-111 15,000 hours Retention Bolt 412-010-124-105 5000 hours Retention Bolt (Expandable) 412-010-137-103 5000 hours Damper Bridge 412-010-104-101 5000 hours...
Page 20 BHT-412-MM-2 FAA APPROVED Table 4-1. Airworthiness Limitations Schedule (Cont) NOMENCLATURE PART NUMBER AIRWORTHINESS LIFE MAIN ROTOR CONTROLS (CONT) Swashplate Outer Ring 412-010-407-117 10,000 hours Pitch Link Rod End Bearing 412-010-412-101 5000 hours Pitch Link Rod End Bearing 412-010-438-101 5000 hours Swashplate Link Rod End Bearing 412-010-412-101 5000 hours...
Page 21 FAA APPROVED BHT-412-MM-2 Table 4-1. Airworthiness Limitations Schedule (Cont) NOMENCLATURE PART NUMBER AIRWORTHINESS LIFE MAIN ROTOR CONTROL SYSTEM BOLTS (CONT) Swashplate Link-to-Rotating Ring (2) 20-057-6-36D 2500 hours Gimbal Ring-to-Swashplate Support (2) 204-011-463-105 2500 hours Gimbal Ring-to-Swashplate Inner 204-011-463-001 1000 hours Ring (2) Gimbal Ring-to-Swashplate Inner 204-011-463-109...
Page 22 BHT-412-MM-2 FAA APPROVED Table 4-1. Airworthiness Limitations Schedule (Cont) NOMENCLATURE PART NUMBER AIRWORTHINESS LIFE PROPULSION AND DRIVE SYSTEM (CONT) Main Rotor Mast Assembly 412-040-101-129 10,000 hours or (used on helicopters with Mast Torque 60,000 RIN Systems) Main Rotor Mast Assembly 412-040-101-135 5000 hours or (used on helicopters with Mast Torque...
Page 23 FAA APPROVED BHT-412-MM-2 Table 4-1. Airworthiness Limitations Schedule (Cont) NOMENCLATURE PART NUMBER AIRWORTHINESS LIFE PROPULSION AND DRIVE SYSTEM (CONT) Splined Plate Assembly 412-010-177-109 10,000 hours or 80,000 RIN Splined Plate Assembly 412-010-177-121 5,000 hours or 60,000 RIN Splined Plate Assembly 412-010-177-113 10,000 hours or 60,000 RIN...
Page 24 BHT-412-MM-2 FAA APPROVED Table 4-1. Airworthiness Limitations Schedule (Cont) NOMENCLATURE PART NUMBER AIRWORTHINESS LIFE LANDING GEAR High Aft Crosstube Assembly 412-050-011-101 10,000 events High Aft Crosstube Assembly 412-050-045-107 20,000 events High Aft Crosstube Assembly 412-321-104 20,000 events High Aft Crosstube Assembly 412-321-901 12,000 events FIRE EXTINGUISHER CARTRIDGES...
Page 25 FAA APPROVED BHT-412-MM-2 Table 4-1. Airworthiness Limitations Schedule (Cont) NOTES : The airworthiness life or inspection interval for any part number contained in this schedule applies to all the successive dash numbers for that component unless it is otherwise specified. In-service life begins the day the component is entered into service.
Page 26 BHT-412-MM-2 FAA APPROVED Table 4-1. Airworthiness Limitations Schedule (Cont) NOTES (CONT): Per ASB 412-99-97. Contained in inflation valve 30905. 30908 includes squib 94455 and o-ring 568-905. Per ASB 412-96-89, the tail rotor flapping stop/yield indicator 212-011-713-103 must be used with the tail rotor yoke.
Page 27 FAA APPROVED BHT-412-MM-2 Table 4-1. Airworthiness Limitations Schedule (Cont) NOTES (CONT): Swashplate support assembly 412-010-453-101 was removed from service by ASB 412-92-61. All subsequent dash numbers remain in service. 500-hour penalty to be applied in accordance with AD 99-23-23 and ASB 412-98-93. AD 2012-22-11 imposes on collective lever 412-010-408-101 a visual inspection at intervals not to exceed 100 hours Time-In-Service (TIS) (ASB 412-11-148 Rev.
Page 28 BHT-412-MM-2 FAA APPROVED Figure 4-1. Longitudinal/Lateral CG Envelope for Hoist Operations 4-00-00 Page 16 Rev. 24 15 SEP 2016 Export Classification C, ECCN EAR99...
Page 29 BHT-412-MM-2 CHAPTER 5 — INSPECTIONS TABLE OF CONTENTS Paragraph Chapter/Section Page Number Title Number Number INSPECTIONS General ..................5-00-00 Inspection Requirements ............... 5-00-00 Crash Damage................5-00-00 5-3A Types of Inspections ..............5-00-00 5-3B Definitions ..................5-00-00 5-3C Inspection and Overhaul Tolerance ..........5-00-00 SCHEDULED INSPECTIONS Scheduled Inspections..............
Page 30 BHT-412-MM-2 TABLE OF CONTENTS (CONT) Paragraph Chapter/Section Page Number Title Number Number 5-29 Each 2500 Hours of Main Rotor Blade Operation......5-00-00 5-30 Each 2500 or 3000 Hours of Main Rotor Mast (412-040-366-109 and Subsequent) Operation............5-00-00 5-31 Each 2500 Hours of Tail Rotor Drive System Operation ....5-00-00 5-32 Each 3000 Hours of Main Rotor Mast...
Page 31 BHT-412-MM-2 TABLES Table Page Number Title Number Component Overhaul Schedule................5-00-00 2 SEP 2014 Rev. 20 Page 2A/2B Export Classification C, ECCN EAR99...
Page 33 You can Bell Helicopter Textron for the Model 412 Series. They request changes to the requirements in this chapter can be utilized by registered owners or operators who through the local aviation authority.
Page 34 Bell Helicopter Textron R E A C H I N G T H E I R L I M I T S O R A S A considers that it is mandatory to obey all the RESULT OF AN ACCIDENT/INCIDENT...
Page 35 60 calendar months, whichever comes first. component overhaul schedule. • Scheduled inspections — Part B consists of the For the common Bell Helicopter Textron approved following: optional equipment that is integrated into this maintenance manual, refer to this chapter for the –...
Page 36 The engineering aspects of other. this change are approved. The program is closely monitored by Bell Helicopter Textron in an operational environment with selected operators. • Standard — An established rule or measure to determine condition.
Page 37 BHT-412-MM-2 Refer to the applicable Pratt & Whitney Canada The following provides examples of when hourly, Engine Maintenance Manual for inspection and calendar, or hourly/calendar inspection tolerances overhaul tolerances. have been applied: Hourly Example (10% or up to a maximum of 100 hours, whichever is less): 300-HOUR NEXT 300-HOUR MAXIMUM ALLOWED...
Page 38: February
BHT-412-MM-2 Hourly/Calendar Example (10% or up to a maximum of 100 hours operating time/30 days calendar time, whichever is less): 5000-HOUR/ NEXT 5000-HOUR/ 5 YEAR MAXIMUM ALLOWED INSPECTION CARRIED 5 YEAR INSPECTION TOLERANCE OUT AT: INSPECTION DUE AT: DUE AT: 6000 Hours/ 10% of 5000 hours = 500 hours 6000 Hours/January 15, 2011...
Page 39 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-4. SCHEDULED INSPECTIONS Part B — Inspect helicopter each 25 hours/30 days, each hours/12 months, each hours/12 months, each 5000 hours/5 years. Part A — Inspect helicopter daily, each 100 hours/12 months, each 1000 hours, each 5000 hours/5 years.
Page 41 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE For helicopters on the Part A inspection program, accomplish the following checks daily before flight...
Page 42 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 5 Review Special Inspections and carry out applicable inspections. Examine all inspection windows and sight glasses for cracking, crazing, and discoloration. If any of these conditions are present, the part must be removed and replaced prior to returning helicopter for service.
Page 43 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 25 MISCELLANEOUS FURNISHINGS Visually inspect miscellaneous furnishing (map and data case, first aid kit, and emergency equipment) for condition and security. Chapter 26 FIRE EXTINGUISHERS Visually inspect cockpit and cabin portable fire extinguishers...
Page 44 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 30 WINDSHIELD WIPER Visually inspect windshield wiper blades for serviceability and security. Chapter 32 LANDING GEAR SYSTEM Visually inspect landing gear as follows: a.
Page 45 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Visually inspect all windows for damage. Crew door windows, cargo hinged door window, passenger sliding door windows, cabin roof windows, cabin lower nose windows, and windshields.
Page 46 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER e. Baggage compartment Chapter 53 TAILBOOM Inspect tailboom exterior structure for general condition. Chapter 52 Inspect baggage compartment interior for condition and cleanliness.
Page 47 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTE Use swashplate link and drive link bearings — Work aid (Chapter 62) to assist with determining condition of main rotor control bearings. Visually inspect drive hub and rephasing levers for bearing looseness and security of attachment.
Page 48 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 63 TRANSMISSION Check for proper oil level. Check external oil filter for bypass indication. Visually inspect transmission cases for damage, condition, and evidence of leaking.
Page 49 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 63 ROTOR BRAKE QUILL AND BRAKE ASSEMBLY Visually inspect rotor brake assembly for condition, damage, and security. Visually inspect rotor brake quill for condition, damage, and leakage.
Page 50 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Tail rotor pitch change links, crosshead, pitch horns, counterweight arms, and links for security, corrosion, and condition. Pitch link bearing and counterweight link bearing looseness shall not exceed 0.015 inch (0.381 mm) axial.
Page 51 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER WARNING CAUSE OF ANY DISCOLORATION SHALL BE DETERMINED AND CORRECTED PRIOR TO NEXT FLIGHT. Flexible couplings and surrounding areas for grease leakage, damage, corrosion, and evidence of overheat as indicated by TEMP-PLATES or coupling discoloration.
Page 52 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Hanger assemblies — bearings and surrounding areas for evidence of grease leakage, condition, damage, security, corrosion, and overheating. Discoloration of bearing (blue or blue/black in color) or multi-color appearance of hanger that darkens adjacent to bearing is evidence of overheating.
Page 53 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 65 INTERMEDIATE GEARBOX NOTE Step 1 through step 4 pertain to helicopters S/N 33001 through 33213 and 36001 through 36019 not modified by 412-570-001-103 or Pre BHT-412-SI-74 (412SP to 412HP Upgrade).
Page 54 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Gearbox assembly for security, condition, corrosion, damage, and oil leaking. WARNING CAUSE OF ANY DISCOLORATION SHALL BE DETERMINED AND CORRECTED PRIOR TO NEXT FLIGHT.
Page 55 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER WARNING CAUSE OF ANY DISCOLORATION SHALL BE DETERMINED AND CORRECTED PRIOR TO NEXT FLIGHT. Input quill flexible coupling (and surrounding area) for grease leakage, damage, corrosion, and evidence of overheat as indicated by TEMP-PLATES or coupling discoloration.
Page 56 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Visually inspect elevators for damage and security. Check elevator control tube for positive spring action and freedom of movement. Chapter 71 LEFT POWER SECTION Inspect gas generator case for cracks, buckled areas, and hot spots.
Page 57 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 71 ENGINE FIREWALLS Visually inspect firewalls for cracks, distortion, missing rivets, broken spot welds, and deteriorating seals or gaskets. Chapter 71 ENGINE AIR MANAGEMENT SYSTEM Visually inspect exhaust ejectors and ducts for damage and security.
Page 58 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-5. DAILY INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Inspect all caution and warning lights for proper operation by using master caution, fire test, and baggage compartment smoke detector press-to-test functions. Check landing and search lights for condition and security.
Page 59 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE For helicopters on the Part A inspection program, accomplish each 100 hours of flight operation or after...
Page 60 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Paragraph 5-44 Overhaul all components that have completed published overhaul periods. Chapter 12 Perform lubrication requirements. 10. Remove all panels, fairings, and cowlings required to satisfactorily carry out the inspection.
Page 61 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 25 MISCELLANEOUS FURNISHINGS Check all safety equipment for inspection due dates and operation. Chapter 26 FIRE PROTECTION Make sure fire extinguishers are properly charged. Baggage compartment smoke detector for condition and security.
Page 62 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 29 HYDRAULIC SYSTEMS Inspect all lines and hoses for security and general condition. Every sixth 100 hour inspection (600 hours) or 12 months: NOTE Hydraulic filter elements 205-076-034-003 are non-cleanable.
Page 63 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Torque forward and aft cross tube support fittings U-bolts to 80 to 100 inch-pounds (9.04 to 11.29 Nm). Torque check ground handling wheel attachment eyebolts on skid tubes 40 to 58 foot-pounds (54 to 79 Nm).
Page 64 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER ASB 412-00-100 Inspect fuselage tailboom attachment components and hardware for cracks with a 10X magnifying glass. Pay particular attention to interface between forward end of tail boom attachment fitting and cap angle, and main beam web area below cap angle (Figure...
Page 65 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER 11. Inspect cabin roof structure: a. Cabin roof structure, cowlings, and fairing for damage, delamination, and general condition. b. Cabin roof and cowling/fairing mounted antennas for condition and security.
Page 66 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Torque check intermediate gearbox mounting bolts by applying torque in tightening direction, do not exceed 50 inch-pounds (5.65 Nm). If any bolt turns under torque, inspect attachment hardware and intermediate gearbox for serviceability.
Page 67 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Every third 100 hour inspection (300 hours) or 12 months: Inspect tailboom joints, splices, longerons, attach fittings, and attaching hardware for corrosion, damage, and cracks. ASB 412-90-49 Remove plug button at BS 99.00.
Page 68 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Inspect pitch horns for corrosion and cracks in areas surrounding torque transfer pin holes. No cracks permitted. Inspect pivot bearings, spindle bearings, and damper set for elastomeric bearing delamination, elastomer degradation, shim cracks, crazing, cracking, or sheeting.
Page 69 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTE The presence of black oxide powder will require investigation to determine the cause. b. Inspect gimble ring bearings, liners, and attaching hardware for excessive looseness and wear.
Page 70 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Torque check four hub and sleeve to rephasing lever attachment bolts to 24 to 34 foot-pounds (33 to 46 Nm) for 1/2 inch bolts or 160 to 200 inch-pounds (18.08 to 22.59 Nm) for 3/8 inch bolts (if installed).
Page 71 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Torque check top case to ring gear case nuts, ring gear case to main case nuts, and main case to support case nuts to 230 to 250 inch-pounds (25.99 to 28.25 Nm).
Page 72 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 65 TAIL ROTOR DRIVESHAFT Hanger assemblies for cracks at mounting ears, corrosion, and security of attachment. Hanger supports for condition and security of attachment. Driveshaft sections and attaching hardware for condition and security.
Page 73 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER a. Universal bearings for looseness. b. Input lever bearings and bolts for wear and looseness. c. Fasteners attaching cylinder lower supports to structure for looseness.
Page 74 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER a. Torque check nuts attaching actuator cylinder to upper supports. b. Remove bolts attaching actuator to lower supports. Check cylinder alignment to lower support. Rod end bearing side loads are not permitted.
Page 75 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Every sixth 100 hour inspection (600 hours) or 12 months: Inspect collective flight controls: a. Flight control systems bellcrank and control tubes for damage, chafing, corrosion, and security of attachment.
Page 76 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER c. Clean internal bore of elevator horn and inspect for corrosion. d. With elevator control removed, attach a spring scale to hole in arm of horn where control tube is normally installed.
Page 77 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER c. Test chip detector electrical circuits. Engine electrical connections: a. Power section 1 ignition leads for corrosion, chafing, and security. b.
Page 78 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Every third 100 hour inspection (300 hours) or 12 months: Inspect engine fuel and power controls: a. Engine control linkages for looseness, lost motion, chafing, damage, and security of attachment.
Page 79 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Calibrate pilot, copilot compass systems, and standby magnetic compass. Drain pitot-static system of any accumulated moisture. Test pitot-static system for leaks. Chapter 96 BATTERY SYSTEM Service battery in accordance with battery manufacturer’s...
Page 80 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER d. Place BATTERY BUS 1 switch and BATTERY BUS 2 switch in the ON position. Position INV 1 and INV 2 switches in the ON position.
Page 81 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-7. 1000 HOUR INSPECTION — PART A INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE For helicopters on the Part A inspection program, accomplish each 1000 hours of flight operation.
Page 82 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-7. 1000 HOUR INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Reconnect drive and swashplate links and tubes, and drive plate set to hub assembly. 5-00-00 Page 50 Rev. 16 26 FEB 2013 Export Classification C, ECCN EAR99...
Page 83 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-8. 5000 HOUR/5 YEAR INSPECTION — PART A INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE For helicopters on the Part A inspection program, accomplish...
Page 84 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-8. 5000 HOUR/5 YEAR INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Electrical and avionics equipment from the nose area, as required, to allow a full visual inspection of the nose area to be done.
Page 85 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-8. 5000 HOUR/5 YEAR INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER g. Tailboom. h. Landing gear assembly. Install all panels, interior coverings, fairings, and cowlings removed during inspection. Do a ground run and leak check before you return the helicopter to service.
Page 86 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-8. 5000 HOUR/5 YEAR INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER 12. Cabin floor area under crew doors for chafing and damage. 13. Crew door hinges for wear, damage, corrosion, and security of attachment.
Page 87 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-8. 5000 HOUR/5 YEAR INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER 24. All structure under floor panels and in forward fuel cell cavities including caps, angles, transverse bulkheads, and bonded panels between FS 74.30 and 155.06 for damage, corrosion, cracks, and voids.
Page 88 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-8. 5000 HOUR/5 YEAR INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER 32. Electrical/avionics compartment, FS 166.00 to 243.937, doors for condition and security. Door frames for cracks and corrosion. Compartment interior for condition and joints for corrosion.
Page 89 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-8. 5000 HOUR/5 YEAR INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Tailboom and fin external skin for damage, corrosion, and cracks. Tailboom access panels and covers for condition and attachment. Tail rotor driveshaft cover hinges for wear. Tailboom baggage compartment door for condition, attachment, and door handle operation.
Page 90 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-8. 5000 HOUR/5 YEAR INSPECTION — PART A (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 67 FLIGHT CONTROLS BHT-412-CR&O BHT-412-SI-44 TB 412-87-60 Disassemble pilot and copilot (if installed) collective stick(s) to the extent necessary to remove throttle twist grips. Referring to Figure 5-1, visually inspect stick tube for...
Page 91: Collective Stick Tube — Part A
BHT-412-MM-2 AREA TO BE INSPECTED UPPER THROTTLE SLOT LOWER THROTTLE SLOT AREA TO BE INSPECTED STICK TUBE 412_MM_05_0002 Figure 5-1. Collective Stick Tube — Part A 5-00-00 2 SEP 2014 Rev. 20 Page 56C Export Classification C, ECCN EAR99...
Page 92 BHT-412-MM-2 Outboard cabin post Sticker plate (aft) Cabin roof longeron Sticker plate (forward) Windshield frame VIEW 412_MM_05_0004+ Figure 5-1A. Cabin Frame Inspection — Part A 5-00-00 Page 56D Rev. 20 2 SEP 2014 Export Classification C, ECCN EAR99...
Page 93 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE For helicopters on the Part B inspection program, accomplish the following checks each 25 hours of...
Page 94 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 5 Review Special Inspections and carry out applicable inspections. Examine all inspection windows and sight glasses for cracking, crazing, and discoloration. If any of these conditions are present, the part must be removed and replaced prior to returning helicopter for service.
Page 95 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 30 Windshield wiper arms and blades for serviceability and security. Chapter 29 Remote hydraulic filter bypass indicator-check for bypass indication.
Page 96 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER g. If installed, landing gear forward crosstube crew step fittings for corrosion, damage, and security in area of attachment. If edge sealant is damaged or missing, remove crew step and inspect crosstube for corrosion or damage.
Page 97 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 95 10. Instruments: a. Instrument panel for cleanliness. b. All instrument, placards, decals, and markings for appearance and legibility. c.
Page 98 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Heat/vent air ducts for condition and proper operation. c. Ventilation/defog components condition security. Chapter 25 14. Miscellaneous furnishings (map and data case, first aid kit, and emergency equipment) for condition and security.
Page 99 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER h. Overheat TEMP-PLATES for condition and security. TEMP-PLATES must not show evidence of overtemperature indication, deterioration, debonding, or excessive discoloration of the epoxy overcoating.
Page 100 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 29 Tail rotor hydraulic actuator and hoses for leakage, corrosion, and security. Chapter 67 Tail rotor control tubes for condition, corrosion, and security.
Page 101 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Gas generator case for cracks, buckled areas, and hot spots. c. Oil and fuel hoses and tubes for chafing, leaking, and security.
Page 102 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER a. Exterior structure for condition, damage, and corrosion. b. Baggage compartment interior for condition and cleanliness. Chapter 52 Baggage compartment door damage, proper...
Page 103 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 67 e. Check elevator attachment lugs at each end of elevator horn for cracks, corrosion, and security. f. Check elevator horn to elevator spar attaching bolts and surrounding joint for cracks, corrosion, and security.
Page 104 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER a. Hanger assemblies — bearings and surrounding areas for evidence of grease leakage, condition, damage, security, corrosion, and overheating. Discoloration of bearing (color change to blue or blue/black) or multi-color appearance of hanger that darkens adjacent to bearing is evidence of overheating.
Page 105 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 65 Tail rotor driveshaft: WARNING CAUSE OF ANY DISCOLORATION SHALL BE DETERMINED AND CORRECTED PRIOR TO NEXT FLIGHT. a. Hanger assemblies — bearings and surrounding areas for evidence of grease leakage, condition, damage, security, corrosion, and overheating.
Page 106 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER e. Overheat TEMP-PLATES for condition and security. TEMP-PLATES must not show evidence of over temperature indication, deterioration, debonding, or excessive discoloration of the epoxy overcoating.
Page 107 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTE Step 10 pertains to helicopters S/N 36020 through 36999, S/N 37002 through 37999, S/N 38001 through 38999, S/N 39101 through 39999, and helicopters modified by 412-570-001-103 or Post BHT-412-SI-74 (412SP to 412HP Upgrade).
Page 108 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 65 11. Tail rotor gearbox: a. Gearbox assembly for security, condition, corrosion, damage, and oil leaking. WARNING CAUSE OF ANY DISCOLORATION SHALL BE DETERMINED AND CORRECTED PRIOR TO NEXT FLIGHT.
Page 109 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Gearbox for proper oil level and oil for evidence of contamination. Chapter 64 13. Tail rotor hub and blade assembly: WARNING N O C R A C K S A R E P E R M I T T E D O N A N Y SURFACE OF THE TAIL ROTOR BLADES.
Page 110 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER CAUTION COUNTERWEIGHT BELLCRANK RETENTION N U T M S 1 4 1 4 5 L 6 , O R I T S E Q U I VA L E N T MS17826-6, IS DESIGNATED AS ONE TIME USE ONLY.
Page 111 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Hydraulic lines for leaks, chafing, and kinking. c. Hydraulic system 1 and 2 reservoirs for proper fluid levels, damage, corrosion, and security. Chapter 62 Main rotor blades: a.
Page 112 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER g. Functionally check droop restraint system. Check for engagement of restraint arms in lower detent of cam window. Relieve load on each blade and verify lower clevis moves freely through cam window envelope.
Page 113 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Inspect gimble ring bearings, liners, and attaching hardware for excessive looseness and wear. Gimble ring bearing and attaching bolt axial or radial looseness shall not exceed 0.005 inch (0.127 mm) with no binding allowed.
Page 114 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER WARNING CAUSE OF ANY DISCOLORATION SHALL BE DETERMINED AND CORRECTED PRIOR TO NEXT FLIGHT. b. Main driveshaft forward and aft couplings, boots, seals (and surrounding area), for grease leakage, damage corrosion and evidence of overheat as indicated by TEMP-PLATES or coupling discoloration.
Page 115 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-10. 300 HOUR/12 MONTH INSPECTION — PART B INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE For helicopters on the Part B inspection program, accomplish the following checks each 300 hours of...
Page 116 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-10. 300 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER FUSELAGE — CABIN Chapter 53 Forward fuselage: a. Cabin exterior structure for corrosion and damage. b. Cabin interior structure for corrosion and damage. c.
Page 117 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-10. 300 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER c. Fasteners attaching cylinder lower supports structure for looseness. d. Cylinder lower bearings for looseness. e. Actuator assembly for damage and leakage. f.
Page 118 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-10. 300 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Input lever bearings and bolts for wear and looseness. c. Fasteners attaching cylinder lower supports structure for looseness. d. Cylinder lower bearings for looseness. e.
Page 119 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-10. 300 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER a. All transmission chip detectors for debris. b. Clean all transmission chip detectors. c. Test all transmission chip detector electrical circuits. d.
Page 120 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-10. 300 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER e. Torque check ground handling wheel attachment eyebolts on skid tubes 40 to 58 foot-pounds (54 to 79 Nm). Eyebolts that rotate prior to reaching 40 foot-pounds (54 Nm) shall be removed and inspected for evidence of bending.
Page 121 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-10. 300 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 71 No. 2 (right) engine power section: a. Chip detectors for debris. b. Clean chip detectors. c. Test chip detector electrical circuits. Chapter 71 Reduction (combining) gearbox: a.
Page 122 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-10. 300 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 71 Inspect the left side and right side engine air inlet cowlings ASB 412-10-140 for gaps between the lower surface of the cowling firewall and the mating horizontal engine firewall.
Page 123 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-10. 300 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER g. Install plug button with sealant (C-308). h. Ensure all drain holes are open. i. Vertical fin spar caps forward side and web from upper tailboom skin to approximately 4.0 inches (101.6 mm) below upper tailboom skin as follows: remove aft tailboom access door.
Page 124 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-10. 300 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER e. Functionally check operation of tube as follows: CAUTION DO NOT RELEASE ELEVATOR AND ALLOW THE S P R I N G T O D R I V E E L E VAT O R B A C K T O ORIGINAL POSITION.
Page 125 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-10. 300 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER a. Hanger assemblies for cracks at mounting ears, corrosion, and security of attachment. b. Hanger supports for condition and security of attachment.
Page 126 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-10. 300 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Clean chip detector. c. Functionally test chip detector electrical circuit. Chapter 12 d. Service gearbox as required. Chapter 65 10.
Page 127 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-10. 300 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER c. Blade retention bolts for condition and security. d. Torque check eight main rotor yoke assembly through bolt nuts to 70 to 80 foot-pounds (95 to 108 Nm). e.
Page 128 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-10. 300 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER a. Inspect EMERG BUS INTC circuit breaker for wear. Operate circuit breaker manually and check by feel. Worn or loose circuit breaker is not acceptable. Close circuit breaker. b.
Page 129 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-11. 600 HOUR/12 MONTH INSPECTION — PART B INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE For helicopters on the Part B inspection program, accomplish the following checks each 600 hours of...
Page 130 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-11. 600 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER AFTER COMPLETION OF INSPECTION Reinstall all panels, fairings, and cowlings removed during inspection. Carry out a ground run and leak check prior to releasing the helicopter back to service.
Page 131 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-11. 600 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 67 Collective flights controls: a. Inspect flight control systems bellcrank and control tubes for damage, chafing, corrosion, and security of attachment.
Page 132 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-11. 600 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTE Maximum N topping check is not applicable to Pratt & Whitney PT6T-9 engine. Chapter 76 11. Engine controls: a. Check collective lever throttle friction adjusters for proper operation.
Page 133 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-11. 600 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER a. Fuselage structure for corrosion and damage to finish and sealant. Pay particular attention to edges of joints and seams and around fastener heads. b.
Page 134 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-11. 600 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Replace engine fire extinguisher container firing cartridges in accordance with specified service life. ASB 412-12-152 c. Visually inspect the loop clamp installed on modified discharge tubes 212-060-921-001FM and -002FM for condition and security until Part III of referenced ASB is accomplished.
Page 135 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-11. 600 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER 19. Inspect all fuel system, oil system, and hydraulic system filler caps for proper functioning and sealing. Make sure the sealing O-rings within the filler caps are in good condition.
Page 136 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-11. 600 HOUR/12 MONTH INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER d. With elevator control removed, attach a spring scale to hole in arm of horn where control tube is normally installed. Pull scale at right angle to arm, verify friction is 26 to 32 pounds (115.65 to 142.34 N).
Page 137 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-12. 5000 HOUR/5 YEAR INSPECTION — PART B INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE For helicopters on the Part B inspection program, accomplish the following checks each 5000 hours...
Page 138 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-12. 5000 HOUR/5 YEAR INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Electrical and avionics equipment from the nose area, as required, to allow a full visual inspection of the nose area to be performed.
Page 139 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-12. 5000 HOUR/5 YEAR INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER g. Tailboom. h. Landing gear assembly. Install all panels, interior coverings, fairings, and cowlings removed during inspection. Do a ground run and leak check before you return the helicopter to service.
Page 140 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-12. 5000 HOUR/5 YEAR INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER 12. Cabin floor area under crew doors for chafing and damage. 13. Crew door hinges for wear, damage, corrosion, and security of attachment.
Page 141 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-12. 5000 HOUR/5 YEAR INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER 24. All structure under floor panels and in forward fuel cell cavities including caps, angles, transverse bulkheads and bonded panels between FS 74.30 and 155.06 for damage, corrosion, cracks, and voids.
Page 142 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-12. 5000 HOUR/5 YEAR INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER 32. Electrical/avionics compartment, FS 166.00 to 243.937, doors for condition and security. Door frames for cracks and corrosion. Compartment interior for condition and joints for corrosion.
Page 143 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-12. 5000 HOUR/5 YEAR INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Tailboom and fin external skin for damage, corrosion, and cracks. Tailboom access panels and covers for condition and attachment. Tail rotor driveshaft cover hinges for wear. Tailboom baggage compartment door for condition, attachment, and door handle operation.
Page 144 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-12. 5000 HOUR/5 YEAR INSPECTION — PART B (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Referring to Figure 5-2, visually inspect stick tube for cracks using a 3X magnifying glass and a bright light. Pay particular attention to the base of the throttle slots that form the twist grip stops.
Page 145 BHT-412-MM-2 AREA TO BE INSPECTED UPPER THROTTLE SLOT LOWER THROTTLE SLOT AREA TO BE INSPECTED STICK TUBE 412_MM_05_0002 Figure 5-2. Collective Stick Tube — Part B 5-00-00 2 SEP 2014 Rev. 20 Page 106C Export Classification C, ECCN EAR99...
Page 146 BHT-412-MM-2 Outboard cabin post Sticker plate (aft) Cabin roof longeron Sticker plate (forward) Windshield frame VIEW 412_MM_05_0004+ Figure 5-2A. Cabin Frame Inspection — Part B 5-00-00 Page 106D Rev. 20 2 SEP 2014 Export Classification C, ECCN EAR99...
Page 147 BHT-412-MM-2 SPECIAL INSPECTIONS 5-13. SPECIAL INSPECTION • Each 2500 hours of main rotor blade operation. Perform applicable special inspection of helicopter: • Each 2500 or 3000 hours of main rotor mast • Daily or each 10 hours, whichever occurs first (412-040-366-109 and subsequent) operation.
Page 148 BHT-412-MM-2 For additional information, refer to the BHT-ALL-SPM. If any confusion exists, or a clarification is desired, contact Product Support Engineering. SUGGESTED TIME MANUAL FRAME TO SPECIFIES ACCOMPLISH 100 hours 90 to 110 hours 50 hours 40 to 60 hours 25 hours 20 to 30 hours 10 hours...
Page 149 BHT-412-MM-2 SPECIAL INSPECTIONS 5-14. DAILY/10 HOUR INSPECTION, WHICHEVER OCCURS FIRST UNTIL 250 HOURS INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish daily or each 10 hours, whichever...
Page 150 BHT-412-MM-2 SPECIAL INSPECTIONS 5-14. DAILY/10 HOUR INSPECTION, WHICHEVER OCCURS FIRST UNTIL 250 HOURS (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER A-4282, A-4288, A-4289, A-4290, A-4303, A-4319, A-4320, A-4325, A-4327, A-4328, A-4329, A-4332, A-4333, A-4334, A-4335, A-4336, A-4337, A-4358, A-4366, A-4368, A-4369, A-4370, A-4371, A-4372, A-4374, A-4376, A-4377, A-4378, A-4379, A-4380, A-4383, A-4385, A-4386, A-4387, A-4394, A-4395,...
Page 151 Engineering of serial number and total time of any gear replaced. d. Install quill pad cover (or rotor brake quill). Return spare (uninstalled) affected serial numbered spiral bevel gears to Bell Helicopter Textron for inspection and re-identification. 5-00-00 26 FEB 2013 Rev. 16...
Page 153 BHT-412-MM-2 SPECIAL INSPECTIONS 5-15. BETWEEN 1 AND 5 FLIGHT HOURS AFTER MAIN ROTOR HUB INSTALLATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE...
Page 155 BHT-412-MM-2 SPECIAL INSPECTIONS 5-15A. BETWEEN 1 AND 25 FLIGHT HOURS AFTER EXPANDABLE BLADE BOLT INSTALLATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE...
Page 157 BHT-412-MM-2 SPECIAL INSPECTIONS 5-16. BETWEEN 5 AND 10 HOURS OF FLIGHT AFTER EACH INSTALLATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish between 5 and 10 hours of flight after...
Page 159 BHT-412-MM-2 SPECIAL INSPECTIONS 5-17. EACH 25 HOURS FOR THE NEXT FOUR INSPECTIONS INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish visual inspection of witness marks (only applicable to hanger bearing 204-040-623-003)
Page 161 BHT-412-MM-2 SPECIAL INSPECTIONS 5-18. EACH 25 HOURS OF TAIL ROTOR OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish inspection each 25 hours of flight operation.
Page 162 BHT-412-MM-2 SPECIAL INSPECTIONS 5-18. EACH 25 HOURS OF TAIL ROTOR OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Carry out a further detailed visual inspection, with a 10X magnifying glass, of the shaded area shown in Figure 5-3, between stations 20.00 and 35.00 of both sides of the blade, with a bright light.
Page 163: Tail Rotor Blade — Special Inspection
BHT-412-MM-2 5.00 20.00 35.00 51.00 MAGNIFICATION MAGNIFICATION MAGNIFICATION 412_MM_05_0003 Figure 5-3. Tail Rotor Blade — Special Inspection 5-00-00 26 FEB 2013 Rev. 16 Page 121/122 Export Classification C, ECCN EAR99...
Page 165 BHT-412-MM-2 SPECIAL INSPECTIONS 5-19. 50 HOURS AFTER INSTALLATION OF COMPONENTS INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish 50 flight hours after each installation of components.
Page 167 BHT-412-MM-2 SPECIAL INSPECTIONS 5-20. 100 HOURS AFTER INSTALLATION OF TAILBOOM INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish 100 hours after each installation of tailboom.
Page 169 BHT-412-MM-2 SPECIAL INSPECTIONS 5-21. EACH 100 HOURS OF COLLECTIVE LEVER OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ ASB 412-11-148 NOTE Accomplish each 100 hours of collective lever...
Page 170 BHT-412-MM-2 SPECIAL INSPECTIONS 5-21. EACH 100 HOURS OF COLLECTIVE LEVER OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER If a crack is found, replace the collective lever with a serviceable part and contact Product Support Engineering to report the defect. If no cracks are found, refinish as required per the BHT-412-CR&O Manual.
Page 171: Collective Lever — Special Inspection
BHT-412-MM-2 Figure 5-4. Collective Lever — Special Inspection 5-00-00 26 FEB 2013 Rev. 16 Page 129/130 Export Classification C, ECCN EAR99...
Page 173 BHT-412-MM-2 SPECIAL INSPECTIONS 5-22. EACH 150 HOURS OF STARTER GENERATOR (200SG119Q) OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish each 150 hours of starter generator 200SG119Q...
Page 175 BHT-412-MM-2 SPECIAL INSPECTIONS 5-22A. EACH 300 HOURS OR 6 MONTHS OF EXPANDABLE BLADE BOLT OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE...
Page 176 BHT-412-MM-2 SPECIAL INSPECTIONS 5-22A. EACH 300 HOURS OR 6 MONTHS OF EXPANDABLE BLADE BOLT OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER CAUTION PAY PARTICULAR ATTENTION NOT TO DISTURB THE RING SEGMENT ORDER AND ORIENTATION DURING THE DISASSEMBLY AND ASSEMBLY OF THE EXPANDABLE BOLT.
Page 177 BHT-412-MM-2 SPECIAL INSPECTIONS 5-22A. EACH 300 HOURS OR 6 MONTHS OF EXPANDABLE BLADE BOLT OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Visually inspect the segments (3) and the expandable blade bolt (1) for cracks, fretting, corrosion, or mechanical damage.
Page 178 BHT-412-MM-2 BLADE BOLT SEGMENT REMOVAL/INSTALLATION WORKAID BLADE BOLT SEGMENT REMOVAL/INSTALLATION WORKAID BEVEL SIDE FACING INWARDS VIEW SEGMENT ORDER BLADE BOLT SEGMENTS REMOVAL/INSTALLATION WORKAID APPLICATION Expandable blade bolt Bolt handle Segments Core pin GREASE (C-561) 412_MM_05_0005 Figure 5-4A. Expandable Blade Bolt — Special Inspection 5-00-00 Page 132D Rev.
Page 179 BHT-412-MM-2 SPECIAL INSPECTIONS 5-23. EACH 600 HOURS OF TAIL ROTOR DRIVESHAFT OPERATION OR 12 MONTHS INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE...
Page 180 BHT-412-MM-2 SPECIAL INSPECTIONS 5-23. EACH 600 HOURS OF TAIL ROTOR DRIVESHAFT OPERATION OR 12 MONTHS (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Install four tail rotor hanger assemblies 212-040-600-ALL. Clean, visually inspect, and repack intermediate gearbox flexible couplings. Clean, visually inspect, and repack tail rotor gearbox flexible coupling.
Page 181 BHT-412-MM-2 SPECIAL INSPECTIONS 5-23. EACH 600 HOURS OF TAIL ROTOR DRIVESHAFT OPERATION OR 12 MONTHS (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Remove tail rotor driveshaft assembly between intermediate gearbox and tail rotor gearbox. NOTE Disassemble flexible coupling only to the extent necessary to remove old grease and repack.
Page 182 BHT-412-MM-2 SPECIAL INSPECTIONS 5-24. EACH 600 HOURS OF MAIN DRIVESHAFT OPERATION OR 12 MONTHS INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish each 600 hours of main driveshaft...
Page 183 BHT-412-MM-2 SPECIAL INSPECTIONS 5-24. EACH 600 HOURS OF MAIN DRIVESHAFT OPERATION OR 12 MONTHS (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 18 Balance driveshaft to below 0.2 IPS. 5-00-00 Export Classification C, ECCN EAR99 15 DEC 2015 Rev. 23 Page 137...
Page 184 BHT-412-MM-2 SPECIAL INSPECTIONS 5-25. EACH 1000 HOURS OF COMPONENT OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish each...
Page 185 BHT-412-MM-2 SPECIAL INSPECTIONS 5-25. EACH 1000 HOURS OF COMPONENT OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 79 OIL COOLER BLOWERS Remove oil cooler blowers. BHT-412-CR&O Disassemble, clean, and visually inspect for corrosion and damage. Replace bearings and any other unserviceable parts. Reassemble oil cooler blowers.
Page 186 BHT-412-MM-2 SPECIAL INSPECTIONS 5-26. EACH 12 MONTHS OR 2500 LANDINGS OF AFT HIGH CROSSTUBE OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE...
Page 187 BHT-412-MM-2 SPECIAL INSPECTIONS 5-26. EACH 12 MONTHS OR 2500 LANDINGS OF AFT HIGH CROSSTUBE OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER HIGH AFT CROSSTUBE ASSEMBLIES (412-050-011-ALL AND 412-050-045-ALL) FLUORESCENT PENETRANT INSPECTION BHT-ALL-SPM NOTE The Fluorescent Penetrant Inspection shall be accomplished by persons meeting the personnel qualification certification...
Page 188 BHT-412-MM-2 SPECIAL INSPECTIONS 5-26. EACH 12 MONTHS OR 2500 LANDINGS OF AFT HIGH CROSSTUBE OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 32 Inspect the abrasion strips (2) for de-bonding. If de-bonding is found refer to Chapter 32 for repair instructions. NOTE Complete edge sealing is required to prevent contamination of the bond between the crosstube...
Page 189 BHT-412-MM-2 SPECIAL INSPECTIONS 5-26. EACH 12 MONTHS OR 2500 LANDINGS OF AFT HIGH CROSSTUBE OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER CAUTION A PLASTIC SCRAPER OR ABRASIVE PAD C-407 M AY B E U S E D TO G E N T LY A S S I S T PA I N T REMOVAL.
Page 190 BHT-412-MM-2 SPECIAL INSPECTIONS 5-26. EACH 12 MONTHS OR 2500 LANDINGS OF AFT HIGH CROSSTUBE OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER 17. Inspect the aft crosstube (3, Figure 5-5) with the exception of the areas under the abrasion strips (2 and 5) and upper support (4) as follows: NOTE All penetrant inspection materials utilized shall be...
Page 191 BHT-412-MM-2 SPECIAL INSPECTIONS 5-26. EACH 12 MONTHS OR 2500 LANDINGS OF AFT HIGH CROSSTUBE OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER CAUTION C O N F I R M B A N D C L A M P A S S E M B LY POSITIONING PRIOR TO INSTALLATION.
Page 192: Aft High Crosstube — Special Inspection
BHT-412-MM-2 2.5 IN. (63.5 mm) DETAIL VIEW LOOKING FORWARD 412_MM_05_0002a Figure 5-5. Aft High Crosstube — Special Inspection (Sheet 1 of 2) 5-00-00 Page 146 Rev. 23 15 DEC 2015 Export Classification C, ECCN EAR99...
Page 193 BHT-412-MM-2 0.05 TO 0.15 IN. DETAIL VIEW LOOKING FORWARD Clamp assembly Abrasion strip Aft crosstube Upper support Larson L101 abrasion strip Lower support 50 TO 70 IN-LBS (5.6 TO 7.9 Nm) NOTES Remove paint/primer from the aft crosstube (3) on the left and right-hand sides. Protect abrasion strip (if installed) during paint removal process.
Page 194 BHT-412-MM-2 SPECIAL INSPECTIONS 5-27. EACH 24 MONTHS OF CONTROL BOLT OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. ____________________ FACILITY: _________________ _ _______________________ HELICOPTER S/N: __________ _ _______________________ REGISTRY NO.: ____________ _ _______________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ _______________________ NOTE Accomplish each 24 months of control bolt operation.
Page 195 BHT-412-MM-2 SPECIAL INSPECTIONS 5-27. EACH 24 MONTHS OF CONTROL BOLT OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER 20-057-5-28D Pitch horn to pitch link (4) 20-057-6-36D Pitch link to rephasing (or 20-057-6-52D) lever (4) 20-057-6-36D Drive Link to rephasing lever 20-057-6-36D Swashplate link to rotating (or 20-057-6-38D)
Page 196 BHT-412-MM-2 SPECIAL INSPECTIONS 5-27. EACH 24 MONTHS OF CONTROL BOLT OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTES: TB 412-86-52 If dual drive links were not installed (S/N 33001 through 33107), the following quantities apply: a. Drive link to rephasing lever (2) 20-057-36D b.
Page 197 BHT-412-MM-2 SCHEDULED INSPECTIONS 5-27A. EACH 24 MONTHS OF MAIN ROTOR MAST OPERATION INITIAL DATA REFERENCES INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish every 24 months of main rotor mast operation...
Page 199 BHT-412-MM-2 SPECIAL INSPECTIONS 5-28. EACH 2500 HOURS OF MAIN ROTOR HUB ASSEMBLY OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish each 2500 hours of main rotor hub...
Page 200 BHT-412-MM-2 SPECIAL INSPECTIONS 5-28. EACH 2500 HOURS OF MAIN ROTOR HUB ASSEMBLY OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTE The following recommendations are not mandatory, but are intended to aid the operator to reduce unscheduled maintenance. Recommend replacement of damper yoke sets at each 2500 hour special inspection and replacement of damper bearings at 5000 hour interval (each...
Page 201 BHT-412-MM-2 SPECIAL INSPECTIONS 5-29. EACH 2500 HOURS OF MAIN ROTOR BLADE OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish every 2500 hours of main rotor blade operation.
Page 203 BHT-412-MM-2 SPECIAL INSPECTIONS 5-30. EACH 2500 OR 3000 HOURS OF MAIN ROTOR MAST (412-040-366-109 AND SUBSEQUENT) OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE...
Page 204 BHT-412-MM-2 SPECIAL INSPECTIONS 5-30. EACH 2500 OR 3000 HOURS OF MAIN ROTOR MAST (412-040-366-109 AND SUBSEQUENT) OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 63 MAIN ROTOR MAST (412-040-366-109, AND BHT-412-CR&O SUBSEQUENT) CAUTION R E M O V E M O N O P O L E S E N S O R B E F O R E REMOVING MAST.
Page 205 BHT-412-MM-2 SPECIAL INSPECTIONS 5-30. EACH 2500 OR 3000 HOURS OF MAIN ROTOR MAST (412-040-366-109 AND SUBSEQUENT) OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Check mast bearing for smooth rolling and freedom from binding. Visually examine lower mast bearing inner race for scratches, dents, corrosion, pitting, spalling, roller skidding, or scoring.
Page 206 BHT-412-MM-2 SPECIAL INSPECTIONS 5-30. EACH 2500 OR 3000 HOURS OF MAIN ROTOR MAST (412-040-366-109 AND SUBSEQUENT) OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER 12. Assemble main rotor mast assembly. 13. Install torquemeter tube assembly and plug. a. For mast assemblies 412-040-366-109, Bell Helicopter will align the spline teeth in the torquemeter tube assembly relative to those in the lower torquemeter rotor.
Page 207 BHT-412-MM-2 SPECIAL INSPECTIONS 5-31. EACH 2500 HOURS OF TAIL ROTOR DRIVE SYSTEM OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish each 2500 hours of tail rotor drive...
Page 208 BHT-412-MM-2 SPECIAL INSPECTIONS 5-31. EACH 2500 HOURS OF TAIL ROTOR DRIVE SYSTEM OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER CAUTION INDEXING FLATS OF 0.015 INCH (0.381 MM) ( T W O P L A C E S 1 8 0 ° A PA R T ) O N D I S C ASSEMBLIES ARE PREFERENTIALLY ORIENTED AND SHOULD NOT BE DISTURBED IN HANDLING.
Page 209 BHT-412-MM-2 SPECIAL INSPECTIONS 5-31. EACH 2500 HOURS OF TAIL ROTOR DRIVE SYSTEM OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER a. Visually examine exterior surface and TEMP-PLATE overtemperature indicators of outer coupling for discoloration evidence overheating. A change color TEMP-PLATES (from white to black) indicates a possible overheat condition and/or component degradation.
Page 210 BHT-412-MM-2 SPECIAL INSPECTIONS 5-31. EACH 2500 HOURS OF TAIL ROTOR DRIVE SYSTEM OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER j. Inspect seal housing for damage that could cause leakage of lubricant. k. Inspect end plate for damage that could cause leakage of lubricant.
Page 211 BHT-412-MM-2 SPECIAL INSPECTIONS 5-31. EACH 2500 HOURS OF TAIL ROTOR DRIVE SYSTEM OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER c. Inspect shaft and flange for evidence of wear, nicks, dents, enlarged holes, and cracks. d. Inspect bearing for grease leakage. e.
Page 212 BHT-412-MM-2 SPECIAL INSPECTIONS 5-31. EACH 2500 HOURS OF TAIL ROTOR DRIVE SYSTEM OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Inspect flange and outer coupling for nicks, dents, enlarged holes, and cracks. BHT-412-CR&O Disassemble coupling assembly for internal inspection as follows: a.
Page 213 BHT-412-MM-2 SPECIAL INSPECTIONS 5-31. EACH 2500 HOURS OF TAIL ROTOR DRIVE SYSTEM OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER j. Inspect end plate for damage that could cause leakage of lubricant. BHT-412-CR&O Assemble and lubricate coupling assembly. Replace TEMP-PLATE overtemperature indicators if discolored or damaged.
Page 214 BHT-412-MM-2 SPECIAL INSPECTIONS 5-31. EACH 2500 HOURS OF TAIL ROTOR DRIVE SYSTEM OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Inspect hanger and outer coupling TEMP-PLATES overtemperature indicators exterior surfaces discoloration and overheat condition. A change in color of TEMP-PLATES (from white to black) indicates a possible overheat condition and/or possible component degradation.
Page 215 BHT-412-MM-2 SPECIAL INSPECTIONS 5-31. EACH 2500 HOURS OF TAIL ROTOR DRIVE SYSTEM OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER CAUTION DO NOT USE SOLVENT TO CLEAN COUPLING TEETH. SOLVENT MAY LEAVE A RESIDUE, W H I C H P R E V E N T S L U B R I C A N T S F R O M ADHERING TO COUPLING.
Page 216 BHT-412-MM-2 SPECIAL INSPECTIONS 5-31. EACH 2500 HOURS OF TAIL ROTOR DRIVE SYSTEM OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Remove input quill adapter spring lock and retainer. Check torque of bolt using increasing torque. Do not exceed 80 foot-pounds (108 Nm).
Page 217 BHT-412-MM-2 SPECIAL INSPECTIONS 5-32. EACH 3000 HOURS OF MAIN ROTOR MAST (412-040-366-103 AND -105) OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE...
Page 218 BHT-412-MM-2 SPECIAL INSPECTIONS 5-32. EACH 3000 HOURS OF MAIN ROTOR MAST (412-040-366-103 AND -105) OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER CAUTION DO NOT STAND OR LAY MAST HORIZONTALLY W I T H M A S T B E A R I N G R E TA I N I N G P L AT E SUPPORTING WEIGHT OF MAST.
Page 219 BHT-412-MM-2 SPECIAL INSPECTIONS 5-32. EACH 3000 HOURS OF MAIN ROTOR MAST (412-040-366-103 AND -105) OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTE Evidence of corrosion on exposed surfaces of mast (pole) assembly will require further disassembly to determine extent of the damage.
Page 221 BHT-412-MM-2 SPECIAL INSPECTIONS 5-33. EACH 3000 HOURS OF TRANSMISSION (412-040-002) OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish each 3000 hours of transmission 412-040-002 operation on helicopters S/N 33001...
Page 222 BHT-412-MM-2 SPECIAL INSPECTIONS 5-33. EACH 3000 HOURS OF TRANSMISSION (412-040-002) OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER c. The maximum acceptable depth of pitting is 0.0005 inch (0.0127 mm). Depth may be measured by using a dial indicator with a needle pointed probe.
Page 223 BHT-412-MM-2 SPECIAL INSPECTIONS 5-33. EACH 3000 HOURS OF TRANSMISSION (412-040-002) OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTE The following inspection is not required if planetary spider 412-040-785-103 is installed. Perform magnetic particle inspection on lower planetary spider 204-040-785-003.
Page 225 BHT-412-MM-2 SPECIAL INSPECTIONS 5-34. EACH 3000 HOURS OF TRANSMISSION (412-040-004) OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish each 3000 hours of transmission 412-040-004 operation on helicopters S/N 36020...
Page 226 BHT-412-MM-2 SPECIAL INSPECTIONS 5-34. EACH 3000 HOURS OF TRANSMISSION (412-040-004) OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 63 After input gear quill has been assembled into main case, install rotor brake quill in transmission. Chapter 63 Visually inspect outside of transmission for evidence of BHT-412-CR&O corrosion, damage, and oil leaks (including leaking at seals at...
Page 227 BHT-412-MM-2 SPECIAL INSPECTIONS 5-34. EACH 3000 HOURS OF TRANSMISSION (412-040-004) OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Planetary component removal: a. Remove upper planetary assembly 204-040-360 and adapter 412-040-107 as an assembly. b. Remove retaining ring M27426-1220C and adapter 412-040-107 from planetary assembly 204-040-360.
Page 228 BHT-412-MM-2 SPECIAL INSPECTIONS 5-34. EACH 3000 HOURS OF TRANSMISSION (412-040-004) OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER e. Visually inspect upper flange surface and upper pilot diameter and lower flange surface and lower pilot diameter of ring gear 205-040-231 for fretting and wear. Visually inspect upper and lower gear teeth contact patterns for evidence of pitting, scoring, wear, or damage.
Page 229 BHT-412-MM-2 SPECIAL INSPECTIONS 5-34. EACH 3000 HOURS OF TRANSMISSION (412-040-004) OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER a. If the index marks indicate movement between gear and inner race of bearing set, remove gear 412-040-701, plate 204-040-357, shim 204-040-348, bearing set 205-040-245, and shim 204-040-350.
Page 230 BHT-412-MM-2 SPECIAL INSPECTIONS 5-34. EACH 3000 HOURS OF TRANSMISSION (412-040-004) OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER 19. Check bearing set 204-040-424 for smoothness and freedom from binding by rotating pinion 412-040-302 by hand. 20. Remove main case assembly. Visually inspect upper and lower flanges and pilot diameters for evidence of fretting and wear.
Page 231 BHT-412-MM-2 SPECIAL INSPECTIONS 5-34. EACH 3000 HOURS OF TRANSMISSION (412-040-004) OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER BHT-412-CR&O 25. Inspect components in drive sump assembly 212-040-365: a. Inspect mating surface and pilot diameter for evidence of fretting and wear. b.
Page 233 BHT-412-MM-2 SPECIAL INSPECTIONS 5-35. 3600 HOURS TOTAL AIRFRAME TIME AND EACH 300 HOURS/12 MONTHS INSPECTION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE...
Page 235 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-36. CONDITIONAL INSPECTION engine combining gearbox clutch non-engagement, misengagement, or in-flight slippage. Perform applicable conditional inspection of helicopter If overhaul evaluation is specified, complete both the after hard landing, after blade strike or other rotating conditional inspection normal inspection system...
Page 237 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-37. AFTER HARD LANDING INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish after hard landing. Evaluate components removed from a helicopter following a hard landing as an interrelated group.
Page 238 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-37. AFTER HARD LANDING (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 32 c. Perform landing gear deflection check. (1) If crosstubes have yielded, remove landing gear and inspect support and attaching structure for signs of yielding or other damage.
Page 239 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-37. AFTER HARD LANDING (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER CAUTION MAST ASSEMBLY 412-040-366-109 IS NOT FIELD SERVICEABLE. IT MUST BE RETURNED TO BHTI A N Y I N S P E C T I O N S R E Q U I R I N G DISASSEMBLY ARE REQUIRED.
Page 240 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-37. AFTER HARD LANDING (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER (9) Tail rotor driveshafts (10) Tail rotor driveshaft hangers (11) Swashplate and support assembly (12) Hub and sleeve assembly and collective lever (13) Helicopter structure directly supporting damaged components identified in above inspections c.
Page 241 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-37. AFTER HARD LANDING (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER i. Inspect engine firewalls for evidence of warping, crushing, or other damage. Chapter 53 j. Make a complete inspection of area where tailboom is attached to forward fuselage section.
Page 243 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-38. SUDDEN STOPPAGE — POWER ON OR OFF INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE If the information contained in the following conditional inspection does not fully reflect the...
Page 244 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-38. SUDDEN STOPPAGE — POWER ON OR OFF (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER If the sudden stoppage conditional inspection is the result of crash damage, all rotating system components shall be considered unserviceable and non-repairable.
Page 245 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-38. SUDDEN STOPPAGE — POWER ON OR OFF (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER When any of these sudden stoppage incidents are reported, do the steps that follow: Chapter 62 If the sudden stoppage was caused by a main rotor strike do the inspection that follows.
Page 246 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-38. SUDDEN STOPPAGE — POWER ON OR OFF (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER (a) Main rotor hub assembly. (b) Main rotor pitch links. (c) Main rotor swashplate and support. (d) Main rotor hub and sleeve. (e) Collective lever.
Page 247 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-38. SUDDEN STOPPAGE — POWER ON OR OFF (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER (b) If the main rotor mast assembly is not visibly bent, twisted or distorted then the main rotor mast, main rotor transmission assembly and rotor brake quill assembly (if installed) shall have an overhaul evaluation performed.
Page 248 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-38. SUDDEN STOPPAGE — POWER ON OR OFF (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTE In all cases ensure damage limits are adhered to. (1) Inspect tail rotor static stop for yielding as noted in Chapter 64 to determine if tail rotor yoke assembly may have been exposed to bending.
Page 249 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-38. SUDDEN STOPPAGE — POWER ON OR OFF (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER (b) Perform a close visual inspection of the tail rotor rotating controls. If no evidence of damage is found, the tail rotor rotating controls may remain in service.
Page 250 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-38. SUDDEN STOPPAGE — POWER ON OR OFF (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Tail rotor driveshaft hanger assemblies: (1) Remove hanger assemblies from helicopter and disassemble as required to allow visual inspection for indications of sudden stoppage.
Page 251 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-38. SUDDEN STOPPAGE — POWER ON OR OFF (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER (2) Disc pack couplings - Any deformation that results in gaps between laminates that are greater than 0.015 inch (0.381 mm), scrap the disk pack coupling. (Not applicable to 412 and 412SP).
Page 252 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-38. SUDDEN STOPPAGE — POWER ON OR OFF (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER (3) If inspection of the tail rotor output quill assembly reveals discrepancies, or gear contact with sump case is evident, remove transmission assembly and an overhaul evaluation of the sump case assembly shall be performed.
Page 253 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-39. AFTER OVERSPEED INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish after overspeed. Components removed from...
Page 254 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-39. AFTER OVERSPEED (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Main rotor blades: (1) Inspect main rotor blades skin for wrinkles and deformation. (2) If no discrepancies are found, main rotor blades may be retained in service. (3) If discrepancies are found, return all blades to an authorized blade repair station.
Page 255 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-39. AFTER OVERSPEED (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER (6) Tail rotor driveshafts (7) Tail rotor driveshafts hangers (8) Swashplate (9) Drive hub and sleeve (10) Tail rotor hub f. Install a serviceable main rotor hub and blade assembly.
Page 257 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-40. AFTER OVERTORQUE INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish after overtorque. Components removed from...
Page 258 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-40. AFTER OVERTORQUE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER PT6T-3B/-3BF PT6T-3B/-3BE/-3 PT6T-3D/-3DE/-3 PT6T-9 BF/-3BG BELL P&WC BELL P&WC BELL P&WC % TQ FT LB % TQ FT LB % TQ FT LB 85.3 82.1 98.7 1100 81.6...
Page 259 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-40. AFTER OVERTORQUE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER When torque has exceeded 100% for 3 seconds or less, but has not exceeded 104% (105% mast torque for helicopters modified by 412-570-001-103 and S/N 36020 through 36999 and 37002 through 37999), with transmission lower spider 204-040-785-003 or 412-040-785-103 installed, then no further maintenance is required.
Page 260 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-40. AFTER OVERTORQUE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER i. Hub and sleeve assembly j. Main driveshaft k. Mast l. Transmission When overtorque exceeds 104%, but does not exceed 112% (105 and 110% mast torque respectively for helicopters S/N 36020 through 36999 and 37002 through 37999, and helicopters modified...
Page 261 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-40. AFTER OVERTORQUE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER When overtorque has exceeded 112% (110% mast torque for helicopters S/N 36020 through 36999 and 37002 through 37999, and helicopters modified by 412-570-001-103 or Post BHT-412-SI-74 (412SP to 412HP Upgrade): a.
Page 263 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-41. AFTER COMPRESSOR STALL OR SURGE INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish after engine compressor stall or surge.
Page 264 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-41. AFTER COMPRESSOR STALL OR SURGE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Power plant: a. Examine inlet screen for blockage. Pratt & Whitney b. Inspect engine compressor region for salt, dust, oil, or Canada Engine other contaminants.
Page 265 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-41. AFTER COMPRESSOR STALL OR SURGE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER e. Remove and inspect tail rotor driveshafts. f. Remove input and output drive quill from intermediate gearbox and inspect gear teeth on pinion and gear for damage with a 10X magnifying glass.
Page 266 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-41. AFTER COMPRESSOR STALL OR SURGE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER (1) Remove tail rotor driveshafts and inspect for the following conditions. Replace any tail rotor driveshafts exceeding limits specified in Chapter 65. If one or more of conditions listed in step a through step d are noted, all hanger assemblies shall be sent for overhaul evaluation.
Page 267 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-41. AFTER COMPRESSOR STALL OR SURGE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER (9) If any discrepancies are noted as a result of inspection in step (6) through step (8), remove main rotor hub assembly, main rotor blades and mast assembly. Removed assemblies shall have an overhaul evaluation performed.
Page 269 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-42. AFTER LIGHTNING STRIKES INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish after lightning strikes. In all instances below, if significant damage has been found in any area, inspection shall be expanded in those areas until it extends beyond the...
Page 270 Remove and visually inspect main rotor blades. If blades show any of the following indications, send the blades to a Bell Helicopter Textron approved blade repair facility for evaluation. State lightning strike as reason for removal. (1) Inspect blades for signs of burns. Burn marks can be very minute.
Page 271 Inspect tail rotor blades and hub. If indications of burns or debonding are present, send the blades to a Bell Helicopter Textron approved blade repair facility for evaluation. State lightning strike as reason for removal. Remove tail rotor hub for overhaul.
Page 272 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-42. AFTER LIGHTNING STRIKES (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER If no visual indications of damage are present, proceed as follows: Chapter 63 a. Remove and inspect all transmission chip detectors. (1) If excessive debris is found on chip detectors, remove transmission and mast assembly for overhaul.
Page 273 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-42. AFTER LIGHTNING STRIKES (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Inspect main rotor blades control links, transmission system, driveshafts, gearboxes, and tailboom structure for magnetization. Using a magnetometer with a  range no larger than 5 gauss, place arrow or red dot (depending magnetometer...
Page 274 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-42. AFTER LIGHTNING STRIKES (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTE Arcing damage on metal components of airframe structure, when cleaned out to twice visible depth, shall be treated as mechanical damage, and damage limits in the BHT-412-MM establish repairability and/or scrap of component.
Page 275 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-43. AFTER ENGINE COMBINING GEARBOX CLUTCH NON-ENGAGEMENT, MISENGAGEMENT, OR IN-FLIGHT SLIPPAGE INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE: _______________ _ ________________________ NOTE Accomplish after engine combining gearbox clutch...
Page 276 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-43. AFTER ENGINE COMBINING GEARBOX CLUTCH NON-ENGAGEMENT, MISENGAGEMENT, OR IN-FLIGHT SLIPPAGE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Pratt & Whitney a. Combining gearbox shall be removed and returned to Canada Engine Pratt & Whitney Canada for investigation. Maintenance Manual b.
Page 277 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-43. AFTER ENGINE COMBINING GEARBOX CLUTCH NON-ENGAGEMENT, MISENGAGEMENT, OR IN-FLIGHT SLIPPAGE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER (6) Perform a 15 minute ground run to determine if any oil leaks are present at rotor brake quill (or quill port cover) assembly.
Page 278 BHT-412-MM-2 CONDITIONAL INSPECTIONS 5-43. AFTER ENGINE COMBINING GEARBOX CLUTCH NON-ENGAGEMENT, MISENGAGEMENT, OR IN-FLIGHT SLIPPAGE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Inspect spiral bevel gear in accordance with step (2) of step 2b. spiral bevel gear damaged, perform misengagement inspection given in step (c) of step 2.
Page 279 BHT-412-MM-2 Figure 5-6. Fuselage Tailboom Attachment Inspection 5-00-00 Export Classification C, ECCN EAR99 26 FEB 2013 Rev. 16 Page 229...
Page 280 BHT-412-MM-2 Figure 5-7. Spiral Bevel Gear Inspection (Sheet 1 of 3) 5-00-00 Page 230 Rev. 16 26 FEB 2013 Export Classification C, ECCN EAR99...
Page 281 BHT-412-MM-2 Figure 5-7. Spiral Bevel Gear Inspection (Sheet 2 of 3) 5-00-00 Export Classification C, ECCN EAR99 26 FEB 2013 Rev. 16 Page 231...
Page 282 BHT-412-MM-2 Figure 5-7. Spiral Bevel Gear Inspection (Sheet 3 of 3) 5-00-00 Page 232 Rev. 16 26 FEB 2013 Export Classification C, ECCN EAR99...
Page 283 BHT-412-MM-2 COMPONENT OVERHAUL SCHEDULE 5-44. COMPONENT OVERHAUL SCHEDULE CAUTION The Component Overhaul Schedule (Table 5-1) provides the time interval between overhaul for each OVERHAUL SCHEDULE FOR SOME KIT applicable helicopter component. COMPONENTS AND/OR PARTS IS NOT COVERED IN THIS SCHEDULE. REFER A P P L I C A B L E S E R V I C E WARNING...
Page 284 BHT-412-MM-2 Table 5-1. Component Overhaul Schedule NOMENCLATURE PART NUMBER OVERHAUL INTERVAL (HOURS) ROTORS Swashplate and Support 412-010-402-101 2500 hours Assembly Collective Lever Assembly 412-010-408-ALL 2500 hours Collective Lever Assembly 412-010-464-101 2500 hours Hub and Sleeve Assembly 412-010-401-105 2500 hours Main Rotor Pitch Link Assembly 412-010-425-ALL 2500 hours Main Rotor Hub Assembly...
Page 285 BHT-412-MM-2 Table 5-1. Component Overhaul Schedule (Cont) NOMENCLATURE PART NUMBER OVERHAUL INTERVAL (HOURS) POWER TRAIN (CONT) Tail Rotor Gearbox Assembly 212-040-004-103 5000 hours Tail Rotor Gearbox Assembly 212-040-004-009 5000 hours Tail Rotor Driveshaft Hangers 212-040-600-005 3000 hours Tail Rotor Driveshaft Hangers 412-040-600-101 5000 hours Tail Rotor Driveshaft Coupling...
Page 286 Incorporation of Increased Maximum Continuous Power Kit (BHT-412-SI-38) P/N 412-706-029-ALL reduces the time between overhaul (TBO) interval to 2500 hours. Mast assembly 412-040-366-109 is not field serviceable. It must be returned to Bell Helicopter Textron for any maintenance requiring disassembly.
Page 287 Refer to Pratt & Whitney Canada PT6T-3D Series Maintenance Manual for instructions on 2500 hour clutch inspection requirements. The 10%/100 hour inspection and overhaul tolerance permitted by Bell Helicopter Textron does not apply to power plant components. Contact Pratt & Whitney Canada for any deviation in maintenance requirements.

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Summary of Contents for Textron Bell 412

Page 1: General Information

Page 15: Sep 2016 Rev.

Page 38: February

Page 91: Collective Stick Tube — Part A

Page 163: Tail Rotor Blade — Special Inspection

Page 171: Collective Lever — Special Inspection

Page 192: Aft High Crosstube — Special Inspection

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Chapter 4 - Airworthiness Limitations Schedule

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Number Title Number Number

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Chapter 5 - Inspections

Special Inspections

Component Overhaul Schedule

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Summary of Contents for Textron Bell 412

Page 1: General Information

Page 15: Sep 2016 Rev.

Page 38: February

Page 91: Collective Stick Tube — Part A

Page 163: Tail Rotor Blade — Special Inspection

Page 171: Collective Lever — Special Inspection

Page 192: Aft High Crosstube — Special Inspection

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Table of Contents