Bell 206L4 Maintenance Manual
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Bell 206L4 Maintenance Manual

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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.
COPYRIGHT NOTICE
COPYRIGHT
201
BELL ® HELICOPTER TEXTRON INC.
AND BELL HELICOPTER TEXTRON
CANADA LTD.
ALL RIGHTS RESERVED
Export Classification C, ECCN EAR99
MAINTENANCE MANUAL
VOLUME 1

GENERAL INFORMATION

NOTICE
REISSUE — 2 DECEMBER 1994
REVISION 24 — 18 JULY 2019
BHT-206L4-MM-1

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  • 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: Title

    BHT-206L4-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 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. THE DATA PUBLISHED HEREIN OR OTHERWISE SUPPLIED BY BELL IS NOT APPLICABLE TO NON-BELL PARTS OR PARTS THAT HAVE BEEN REPAIRED USING DATA AND/OR PROCESSES NOT APPROVED BY BELL.
  • Page 4 Model 204, 205, 212, or 412 Phone: 450-437-6201 or 800-363-8028 (U.S./Canada) Fax: 450-433-0272 E-mail: productsupport@bellflight.com Model 210, HUEY II, and All Bell’s Active and Surplus Military Medium Helicopter Models Phone: 817-280-3548 Fax: 817-280-2635 E-mail: mts-medium@bellflight.com Model OH-58, TH-67, TH-57, Both Active and Surplus...

  • Page 5: Table Of Contents

    BHT-206L4-MM-1 LOG OF REVISIONS Insert latest revision pages and dispose of superseded ones. On a revised page, the text and/or illustration affected by the latest revision is shown by a vertical line. A revised page with only a vertical line next to the page number indicates that text has shifted or that non-technical correction(s) were made on that page.
  • Page 6 BHT-206L4-MM-1 LOG OF PAGES (CONT) Page No. Rev No. Page No. Rev No. Page No. Rev No. 159/160....18 Chapter 11 63 – 64....24 161 .
  • Page 7 BHT-206L4-MM-1 LOG OF PAGES (CONT) Page No. Rev No. Page No. Rev No. Page No. Rev No. 19 ......0 64 .
  • Page 8 BHT-206L4-MM-1 LOG OF PAGES (CONT) Page No. Rev No. Page No. Rev No. Page No. Rev No. VOLUME 7 11/12 ..... 0 Chapter 71 13 –...
  • Page 9 BHT-206L4-MM-1 LOG OF PAGES (CONT) Page No. Rev No. Page No. Rev No. Page No. Rev No. Chapter 95 16E/16F ....24 27/28 ..... 0 1 –...

  • Page 11: Help

    VALUATE OGISTICS UBLICATIONS Have you found something wrong with this manual — an error, an inconsistency, unclear instructions, etc.? Although we strive for accuracy and clarity, we may make errors on occasion. If we do and you discover it, we would appreciate your telling us about it so that we can change whatever is incorrect or unclear.

  • Page 13: Customer Feedback

    CUSTOMER FEEDBACK RETURN VIA FAX TO PRODUCT SUPPORT ENGINEERING (450) 433-0272 Manual Title: ___________________________________________________________ Manual Number (if assigned): _____________________________________________ Date of Issue: ___________________________________________________________ Date of Last Revision: ___________________________________________________ Section, Chapter, Paragraph Affected: ______________________________________ Your Feedback: ________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ Now Reads: ____________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________...
  • Page 14 TAPE HERE POSTAGE NECESSARY Product Support Engineering 12,800 rue de l’Avenir Mirabel, Québec, Canada, J7J 1R4 FOLD ON DOTTED LINES AND TAPE Export Classification C, ECCN EAR99 TAPE HERE...

  • Page 15: Helicopter Sales Notice

    Please complete this form and return by mail, e-mail (publications@b .com), or fax (817-280-6466, Attention: CPDC). This will ensure that the new owners/operators receive updates to their Bell Helicopter Textron Technical Manuals and Bulletins. Model of Helicopter Sold or Purchased ___________________________________________ Serial and Registration Number _________________________________________________...
  • Page 16 From NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES BUSINESS REPLY MAIL FIRST CLASS PERMIT NO. 1744 FORT WORTH, TEXAS COMMERCIAL PUBLICATION DISTRIBUTION CENTER P.O. BOX 482 FORT WORTH, TEXAS 76101-0482 FOLD ON DOTTED LINES AND TAPE TAPE HERE Export Classification C, ECCN EAR99...

  • Page 17: Warranty

    Bell Product Support. Repairs and alterations which use or incorporate parts and components other than genuine Bell parts or parts approved by Bell for direct acquisition from sources other than Bell itself are not warranted by Bell, and this warranty shall be void to the extent that such repairs and alterations, in Seller’s sole judgment, affect the stability, safety or reliability of the helicopter...
  • Page 19 BHT-206L4-MM-1 BULLETIN RECORD Unless otherwise specified, all applicable Alert Service Bulletins and Technical Bulletins issued prior to and including the bulletins listed below have been incorporated in this manual. Subsequent applicable bulletins will be incorporated in future revisions/reissues. ALERT SERVICE BULLETINS...
  • Page 20 BHT-206L4-MM-1 TEMPORARY REVISION RECORD This Temporary Revision Record provides a current listing of active Temporary Revisions against the manual. Temporary Revisions, which have been canceled/incorporated, will only be maintained on the record until the next revision is issued. If there are no Temporary Revisions shown on the record, this is confirmation that there are no Temporary Revisions issued against the manual.

  • Page 21: I/Ii

    BHT-206L4-MM-1 LIST OF CHAPTERS Title Chapter Introduction ................1 Airworthiness Limitations Schedule.
  • Page 23 TC APPROVED BHT-206L4-MM-1 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 Tailboom Upper Left Attachment Fitting (206-032-409-001) — Recurring 110-Hour Inspection ..............
  • Page 24 BHT-206L4-MM-1 TC APPROVED REVISION NO. DATE OF SIGNATURE APPROVAL SIGNATURE Original 2 October 1992 Reissue 2 December 1994 21 April 1998 9 December 2002 22 December 2003 30 October 2007 26 May 2009 4-00-00 Page 2 Rev. 23 25 JUN 2019...
  • Page 25 TC APPROVED BHT-206L4-MM-1 REVISION NO. DATE OF SIGNATURE APPROVAL SIGNATURE 25 September 2009 8 April 2011 29 February 2012 1 June 2012 7 November 2012 4-00-00 Export Classification C, ECCN EAR99 25 JUN 2019 Rev. 23 Page 3...
  • Page 26 BHT-206L4-MM-1 TC APPROVED REVISION NO. DATE OF SIGNATURE APPROVAL SIGNATURE 25 June 2019 4-00-00 Page 4 Rev. 23 25 JUN 2019 Export Classification C, ECCN EAR99...
  • Page 27 P R O C E S S E S D E V E L O P E D FOR THE ASSEMBLY OR HELICOPTER. APPROVED BY PARTIES OTHER THAN BELL HELICOPTER ARE USED, THEN THE DATA PUBLISHED OR OTHERWISE NOTE SUPPLIED BY BELL HELICOPTER ARE N O T A P P L I C A B L E .

  • Page 28: Cover

    A P P R O V E D C O M M E R C I A L F L I G H T assemblies are determined by experience, tests, and ENVELOPE. CONSEQUENTLY, PARTS the judgment of Bell Helicopter engineers. The lives THAT HAVE BEEN USED ON MILITARY cannot be changed without the approval of the HELICOPTERS SHOULD NOT BE USED Minister of Transport Canada.
  • Page 29 TC APPROVED BHT-206L4-MM-1 Table 4-1. Airworthiness Limitations Schedule (Cont) COMPONENT AIRWORTHINESS LIFE PART NUMBER MAIN ROTOR HUB AND BLADES (CONT) Main Rotor Blade 206-015-001-125/-127/-129/-131 2300 hours Tension Torsion Strap 206-310-004-103 1200 hours/48 months SWASHPLATE AND SUPPORT Lower Cyclic Tube 206-001-193-001...
  • Page 30 Reserved. Reserved. Selected serial numbers of main rotor mast 206-040-535-105 will have been returned to Bell Helicopter Textron (BHT) for metallurgical evaluation no later than 31 May 1987. Affected masts inspected at BHT and found to be acceptable have the suffix “U” added to the serial number. Refer to ASB 206L-87-44, dated 23 April 1987 for list of serial numbers affected.
  • Page 31 RIN if the mast is installed on 206L, 206L1, or 206L3 (includes 206L3 with Increase Power Operation kit installed per BHT-206-SI-2039) and two RIN if the mast is installed on a 206L4. Refer to ASB 206L-94-99 Rev. B, dated 10 August 2001.
  • Page 32 Main rotor blades 206-015-001-ALL (all dash numbers). It is permissible to use any main rotor blade (mix and match) on 206L, 206L1, 206L3, 206L4, provided that all conditions are met. Refer to TB 206L-87-142, dated 1 October 1987, and IL 206L-00-68 Rev. A or subsequent.

  • Page 33: Tailboom Upper Left Attachment Fitting

    TC APPROVED BHT-206L4-MM-1 Table 4-2. Inspection Limitations Schedule INSPECTION INTERVAL COMPONENT PART NUMBER (HOURS OPERATING TIME) Tailboom Upper Left Attachment 206-032-409-001 110 hours Fitting NOTES: Inspection limitation for the part number listed applies to all successive dash numbers for that component unless otherwise specified.

  • Page 34: Recurring 110-Hour Inspection

    BHT-206L4-MM-1 TC APPROVED (DETAILS OMITTED FOR CLARITY) INSPECTION PROCEDURE: Inspect upper left attachment fitting for cracks, mechanical damage, corrosion damage, loose rivets, and general condition. Refer to ASB 206L-09-158 for wear, damage, and repair limits. Repair fitting in accordance with ASB 206L-09-158.

  • Page 35: Title

    BHT-206L4-MM-1 CHAPTER 5 — INSPECTIONS AND COMPONENT OVERHAUL SCHEDULE TABLE OF CONTENTS Paragraph Chapter/Section Page Number Title Number Number INSPECTIONS AND COMPONENT OVERHAUL SCHEDULE General ..................5-00-00 Items Not Covered and Inspection Responsibility ......5-00-00 Crash Damage................5-00-00 Types of Inspections ..............

  • Page 36: Figure Page

    BHT-206L4-MM-1 TABLE OF CONTENTS (CONT) Paragraph Chapter/Section Page Number Title Number Number 5-42 3000 Hours of Component Operation ..........5-00-00 SPECIAL INSPECTIONS 5-43 Special Inspections ................ 5-00-00 5-44 After Fuel System Maintenance and/or Component Change ..5-00-00 5-45 1 to 5 Hours After Each Installation ..........

  • Page 37: Inspections And Component Overhaul Schedule

    Lead The Fleet (LTF), or any other special programs and the judgement of Bell Helicopter Textron Make sure the Alert Service Bulletins (ASB), the engineers. They are subject to change only by Bell Airworthiness Directives (AD), and the special 5-00-00 ECCN EAR99 25 FEB 2011 Rev.

  • Page 38: Crash Damage

    Bell Make sure all of the maintenance that is done on Helicopter Textron. the helicopter is done by an approved maintenance organization.

  • Page 39: Definitions

    The engineering aspects of this change are approved. The program is closely • Periodic inspection — An inspection that is monitored by Bell Helicopter Textron in an repeated at equal time intervals. operational environment with selected operators. •...

  • Page 40: Inspection And Overhaul Tolerance

    AIRWORTHINESS LIFE (CHAPTER 4). If approval of the inspection and overhaul tolerance is required by the applicable governing aviation authority, The Bell Helicopter Textron approved tolerance for this is the responsibility of the owner/operator. scheduled inspections, special inspections, interim inspections, and overhaul intervals, unless otherwise...
  • Page 41 BHT-206L4-MM-1 Calendar Example (10% or up to a maximum of 6 months calendar time, whichever is less): 12-MONTH NEXT 12-MONTH MAXIMUM ALLOWED INSPECTION CARRIED INSPECTION INSPECTION TOLERANCE OUT ON: DUE ON: DUE ON: June 10, 2010 10% of 12 months = 1.2 months...

  • Page 43: Scheduled Inspections

    100 or 300-hour airframe periodic inspection is available. You 4 and 5 may choose one of these Bell Helicopter inspection programs or you can design your own program. You are responsible for the selection of an inspection...

  • Page 44: 300-Hour Airframe Progressive Inspection Program

    BHT-206L4-MM-1 • Weekly inspection In addition to performing the 300-hour airframe progressive inspection program, you also need to perform record following scheduled • 12-month inspection inspections: • 12 months of component operation NOTE • 24-month inspection Helicopters completing 300-hour airframe progressive inspection program •...

  • Page 45: 100-Hour Airframe Periodic Inspection Program

    BHT-206L4-MM-1 Depending on the helicopter configuration, you have • 3000 hours of component operation the option to either use the 100-hour airframe periodic inspection program or the 300-hour airframe periodic 5-14. 300-HOUR AIRFRAME PERIODIC inspection program. To determine the helicopter...

  • Page 46: Changing Inspection Program

    BHT-206L4-MM-1 5-15. CHANGING INSPECTION PROGRAM • change from 300-hour airframe progressive inspection program to a 300-hour You must use either the airframe periodic inspection airframe periodic inspection program, do a program or the airframe progressive inspection complete 300-hour airframe periodic program from the start.
  • Page 47 BHT-206L4-MM-1 5-00-00 ECCN EAR99 25 FEB 2011 Rev. 13 Page 11...
  • Page 48 BHT-206L4-MM-1 5-00-00 Page 12 Rev. 13 25 FEB 2011 ECCN EAR99...
  • Page 49 BHT-206L4-MM-1 5-00-00 25 FEB 2011 Rev. 13 Page 13/14 ECCN EAR99...
  • Page 51 BHT-206L4-MM-1 ZONE 2 ZONE 1 ZONE 6 ZONE 5 ZONE 3 ZONE 4 ZONE 9 ZONE 7 ZONE 8 ZONE 10 - Main rotor hub and blade assembly Zone 1 - Tail rotor hub and blade assembly Zone 2 - Forward top deck...

  • Page 53: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-16. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ ZONE 1 —...

  • Page 54: 100-Hour Airframe Progressive Inspection - Event No. 1

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-16. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER If applicable, reinstall main rotor blade leading edge erosion protection tape. Examine following main rotor assembly components for condition and security: a.

  • Page 55: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-16. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER c. Touch up all repaired areas or areas of bare metal in accordance with applicable main rotor hub inspection and repair instructions.

  • Page 56: Chapter 7

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-16. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER c. Deformed or cracked skin in the area of the chordwise weights. d. Leading edge for erosion, nicks, dents or scratches.

  • Page 57: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-16. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 53 Clean transmission deck. Examine air induction cowling and plenum for damage, obstructions and cleanliness. Examine intake fairing windows for damage and cleanliness.

  • Page 58: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-16. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Verify all control tubes and bellcranks for freedom of travel throughout range. Chapter 62 SWASHPLATE ASSEMBLY AND MAST Clean swashplate assembly and mast.

  • Page 59: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-16. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER 14. Examine the upper inside diameter of swashplate support for evidence of contact with the mast pole. 15. Connect and secure boot, idler (drive) link and main rotor pitch links to outer ring.
  • Page 60 BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-16. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER a. Transmission link assemblies and bearings for damage and deterioration. b. Nodal beam flexures for condition and security. c. Forward and aft nodal beam deck supports for condition and security.

  • Page 61: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-16. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Ensure no sealant voids are visible around forward and aft nodal beam deck mounted supports and isolation mount. Recoat with sealant (C-308) as required.

  • Page 63: Chapter 7

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-17. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ ZONE 4 —...

  • Page 64: 100-Hour Airframe Progressive Inspection - Event No. 2

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-17. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 96 Examine the primary electrical ground connection in engine pan area for condition and security POWER PLANT Rolls-Royce 250-C30...

  • Page 65: Chapter 7

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-17. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Check freedom of full throttle grip travel and idle release operation. Return to closed position. Check copilot throttle if installed.

  • Page 66: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-17. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DRIVETRAIN Chapter 63 Examine freewheel assembly for condition, leaks, and security. Chapter 63 Examine the freewheel unit chip detector for accumulated Chapter 96 material.

  • Page 67: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-17. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER OIL SYSTEM Chapter 79 Examine oil cooler area for evidence of oil leaks. Examine oil cooler pan for cleanliness and make sure the drain is not blocked.

  • Page 68: Chapter 9

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-17. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Torque check disc pack coupling fasteners 50 to 70 inch-pounds (5.7 to 7.9 Nm). Chapter 96 ELECTRICAL Examine all electrical components, wires, cables, and connectors in the area of the aft deck for chafing, and general condition and security.

  • Page 69: Cover

    Examine anti-chafing adhesive tape (C-460) on tailboom for condition. Replace worn or damaged tape as required. NOTE In the event that cracks are found, contact Bell Helicopter Textron, Product Support Engineering. Examine entire tailboom for the following conditions: a. Dents.

  • Page 70: 100-Hour Airframe Progressive Inspection - Event No. 3

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-18. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTE Pay particular attention to the upper left side tailboom quadrant. b. Cracks. c. Deformation. NOTE Pay particular attention to the rivets attaching the tail rotor gearbox support to the tailboom.

  • Page 71: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-18. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 32 14. Examine tailskid for condition, security and signs of ground contact. TAIL ROTOR DRIVESHAFTS Chapter 65 Examine tail rotor driveshaft hanger bearings for excessive grease leakage and evidence of overheating.

  • Page 72: Chapter 9

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-18. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Lower control mechanism rod for condition of bearings. c. Pitch links and spherical bearings for condition and security.
  • Page 73 BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-19. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ ZONE 7 —...

  • Page 74: 100-Hour Airframe Progressive Inspection - Event No. 4

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-19. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 21 Examine the ventilation system for condition and security. Verify nose vents for proper operation, absence of obstructions or debris, and open drains.

  • Page 75: Chapter 9

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-19. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Verify operation of ENGINE OUT and LOW ROTOR RPM audio and mute switch (if installed). Verify illumination of all caution panel annunciator light segments by depressing test switch, or each individual light segment, as applicable.

  • Page 76: Chapter 9

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-19. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 52 Examine components in battery compartment for condition and security. Chapter 32 Examine cabin entry steps (if installed) for condition and security.

  • Page 77: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-19. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER ZONE 9 — AFT FUSELAGE PLACARDS AND MARKINGS Chapter 11 Examine the placards, decals and markings. Make sure they are readable, correctly applied and in agreement with the applicable configuration of your helicopter.

  • Page 78: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-19. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER c. Examine drain lines for condition and security. d. Examine aft fuselage longerons for cracks, corrosion, and condition. Pay particular attention to the upper left longeron between aft fuselage frame at STA 204.49 and frame at...
  • Page 79 BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-19. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Examine all optional equipment installed in the aft fuselage area for condition and security. Verify proper operation of fuel sump drain valve switch.

  • Page 80: Chapter 9

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-19. 100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Examine skid shoes for condition and security. Examine skid tube saddles for corrosion, damage, and security. Examine ground handling wheel attachment bolts for condition and security.

  • Page 81: 100-Hour Airframe Periodic Inspection

    BHT-206L4-MM-1 PERIODIC INSPECTION 5-20. 100-HOUR AIRFRAME PERIODIC INSPECTION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MUCH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ Do this inspection every 100 hours of operation or every 12 calendar months.

  • Page 83: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-21. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ ZONE 1 —...

  • Page 84: 300-Hour Airframe Progressive Inspection - Event No. 1

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-21. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER If applicable, reinstall main rotor blade leading edge erosion protection tape. Examine following main rotor assembly components for condition and security: a.

  • Page 85: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-21. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER d. Ensure no sealant voids are visible around shields or wear sleeve, strap fittings, and grip closure. Recoat with sealant (C-308) as required.
  • Page 86 BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-21. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER e. Bonded joints of blade skin mating area for suspected voids or cracks. Pay particular attention in the area of tip block and doublers.

  • Page 87: Chapter 7

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-22. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ ZONE 3 —...

  • Page 88: 300-Hour Airframe Progressive Inspection - Event No. 2

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-22. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Examine particle separator (if applicable) vortex tubes, ejector tubes, and ejector nozzles for cleanliness, condition, and security. Examine forward deck drain(s) to ensure absence of obstruction.
  • Page 89 BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-22. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Disconnect idler (drive) link from outer ring. Examine swashplate drive assembly for axial, radial, and accumulative wear. Disconnect boot from swashplate outer ring and lift up temporarily.

  • Page 90: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-22. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER 16. Connect and secure boot, idler (drive) link and main rotor pitch links to outer ring. 17. Examine swashplate assembly for condition and security.

  • Page 91: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-22. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 63 TRANSMISSION AND PYLON ASSEMBLY Examine the following pylon support components: a. Transmission link assemblies and bearings for damage and deterioration.

  • Page 92: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-22. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Ensure no sealant voids are visible around forward and aft nodal beam deck mounted supports and isolation mount. Recoat with sealant (C-308) as required.

  • Page 93: Chapter 7

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-23. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ ZONE 4 —...

  • Page 94: 300-Hour Airframe Progressive Inspection - Event No. 3

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-23. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 71 Examine engine mount legs for condition and security. Pay particular attention for loose fasteners. Examine engine mount fittings for condition and security.

  • Page 95: Chapter 7

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-23. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER 11. Deleted. Chapter 95 12. Perform operational check of turbine outlet temperature system. Chapter 76 13. Examine engine controls for condition and security.

  • Page 96: Chapter 7

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-23. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER e. Lower collective stick full down. f. Position N governor actuator to full DECREASE (extended). g. Verify for clearance between governor stop and lever stop arm.

  • Page 97: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-23. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Rolls-Royce 250-C30 c. Then proceed with Rolls-Royce engine fuel system Series Operation and purging procedure. Maintenance Manual, 14W2 Ensure air is purged from fuel filter head and check for fuel leaks during ground run.

  • Page 98: Chapter 9

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-23. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 96 ELECTRICAL Examine all electrical components, wires, cables, and connectors in the power plant area for chafing, general condition, and security.

  • Page 99: Chapter 7

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-24. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ ZONE 5 —...

  • Page 100: 300-Hour Airframe Progressive Inspection - Event No. 4

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-24. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Examine oil cooler core for obstructions and cleanliness. Chapter 65 Examine oil cooler blower and housing for cleanliness, condition and security.

  • Page 101: Chapter 9

    Examine anti-chafing adhesive tape (C-460) on tailboom for condition. Replace worn or damaged tape as required. NOTE In the event that cracks are found, contact Bell Helicopter Textron, Product Support Engineering. Examine entire tailboom for the following conditions: a. Dents.

  • Page 102: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-24. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTE Pay particular attention to the rivets attaching the tail rotor gearbox support to the tailboom. BHT-206-SRM d. Loose rivets. Replace as required.

  • Page 103: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-24. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 12 Lubricate tail rotor driveshaft hanger bearings. Examine and lubricate the aft tail rotor driveshaft splined adapter. Chapter 65 Examine segmented driveshafts and aft splined adapter for condition and security.

  • Page 104: Chapter 9

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-24. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Lower control mechanism rod for condition of bearings. c. Pitch links and spherical bearings for condition and security.

  • Page 105: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-25. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 5 INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ ZONE 7 —...

  • Page 106: 300-Hour Airframe Progressive Inspection - Event No. 5

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-25. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 5 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 96 Examine electrical components behind hat bin for condition, security, and cleanliness. Chapter 53 Examine engine and transmission support structure for cracks, corrosion, or loose fasteners.

  • Page 107: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-25. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 5 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 96 d. Wiring and electrical components for condition and security. Chapter 53 e. Structure for corrosion, cracks, and condition.

  • Page 108: Chapter 9

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-25. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 5 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Examine the cyclic control stick for condition and security and minimum friction. Examine copilot cyclic control stick if installed.

  • Page 109: Chapter 9

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-25. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 5 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER FUSELAGE Chapter 53 Examine forward fuselage for condition. Chapter 52 Examine all cabin doors for condition and security. Give special attention to the following a.

  • Page 110: Chapter 9

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-25. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 5 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 96 and ELECTRICAL AND AVIONICS Chapter 97 Examine all visible electrical components, wires, cables, and connectors in the area of the forward fuselage for chafing, and general condition and security.

  • Page 111: Chapter 9

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-25. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 5 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Make sure that helicopter is ready for ground run and that surrounding area is clear. BHT-206L4-FM-1 Start the helicopter and conduct ground run at 100% N check for leaks and ensure all systems are operational and parameters are within Flight Manual limitations.

  • Page 113: Chapter 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-26. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 6 INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ ZONE 9 —...

  • Page 114: 300-Hour Airframe Progressive Inspection - Event No. 6

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-26. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 6 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 96 Verify operation of the baggage door ajar caution light, (if installed). FUSELAGE (INTERIOR) Chapter 53 Examine baggage compartment for condition.

  • Page 115: Chapter 9

    BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-26. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 6 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 96 and ELECTRICAL AND AVIONICS Chapter 97 Examine antennas for condition and security. Examine all components, electrical wiring, cables, and connectors for chafing, general condition, and security.
  • Page 116 BHT-206L4-MM-1 PROGRESSIVE INSPECTIONS 5-26. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 6 (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Examine cabin entry steps for condition and security (if installed). Examine sealant joint at junction with skid tube saddles.

  • Page 117: 300-Hour Airframe Periodic Inspection

    BHT-206L4-MM-1 PERIODIC INSPECTION 5-27. 300-HOUR AIRFRAME PERIODIC INSPECTION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MUCH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ Do this inspection every 300 hours of operation or every 12 calendar months.

  • Page 119: 100-Hour Inspection

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-28. 100-HOUR INSPECTION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ NOTE 100-hour inspection must be accomplished when...
  • Page 120 BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-28. 100-HOUR INSPECTION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Examine the four tailboom attachment fittings on fuselage aft bulkhead and tailboom forward bulkhead for cracks. Give special attention to the tailboom attachment fittings/intercostals and bolts, and to fasteners between the intercostal. Particular attention must be given to inspection of the upper left fitting (refer to Chapter 4, Inspection Limitations Schedule).

  • Page 121: 300-Hour Inspection

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-29. 300-HOUR INSPECTION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ NOTE Every 300 hours of operation, the 300-hour...

  • Page 122: Chapter 6

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-29. 300-HOUR INSPECTION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 96 Examine electrical components behind hat bin for condition, security, and cleanliness. Chapter 53 Examine engine and transmission support structure for cracks, corrosion, or loose fasteners.

  • Page 123: Chapter 6

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-29. 300-HOUR INSPECTION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 96 d. Wiring and electrical components for condition and security. Chapter 53 e. Structure for corrosion, cracks, and condition. CONTROLS Chapter 67 Verify minimum friction of collective control and readjust as required.

  • Page 124: Chapter 6

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-29. 300-HOUR INSPECTION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER HYDRAULIC Chapter 12 Remove hydraulic pump and rotor tachometer generator. Chapter 29 Chapter 63 Examine hydraulic pump shaft splines rotor tachometer splines for excessive wear.

  • Page 125: Chapter 7

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-29. 300-HOUR INSPECTION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Replace airframe fuel filter element. Chapter 28 Purge airframe and engine fuel system as follows: a. Turn both fuel boost pumps ON. b. Depress airframe fuel filter bypass valve “press to test”...

  • Page 126: Chapter 6

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-29. 300-HOUR INSPECTION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER b. Open engine compartment cowling. c. Using bright light and mirror, inspect exposed upper and lower edges of the joints and fastener between aluminum longeron and titanium engine pan. Edge of sealant coating should be visible.

  • Page 127: Chapter 6

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-29. 300-HOUR INSPECTION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 65 TAIL ROTOR GEARBOX Torque check tail rotor gearbox retaining nuts 50 to 70 inch-pounds (5.6 to 7.9 Nm). TAIL ROTOR HUB AND BLADE ASSEMBLY...

  • Page 129: 1200-Hour Inspection

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-30. 1200-HOUR INSPECTION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ NOTE This inspection must be accomplished every 1200 flight hours.

  • Page 130: Chapter 6

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-30. 1200-HOUR INSPECTION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER If no crack is found, inspect cyclic stick tube for mechanical and corrosion damage as follows: a. Damaged and repaired areas must be separated by 1.0 inch (25 mm) minimum.
  • Page 131 BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-30. 1200-HOUR INSPECTION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER TAILBOOM NOTE This inspection is to be complied with every 1200 hours of tailboom operation after compliance with ASB 206L-99-115, except as follows: The inspection is not required for tailbooms...

  • Page 132: Chapter 6

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-30. 1200-HOUR INSPECTION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER d. Inspect edge of doubler for delamination between skin and doubler. e. Inspect tailboom skin area up to 1.00 inch (25.40 mm) area around doubler for cracks.

  • Page 133: Chapter 6

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-30. 1200-HOUR INSPECTION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER BHT-206L-CR&O b. If nylatron sleeves were worn through, exposing bare surface of control tube, and control tube is worn not in excess of 0.004 inch (0.10 mm) on one side only, replace worn nylatron sleeves.

  • Page 135: As Required By Manufacturer

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-31. AS REQUIRED BY MANUFACTURER INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ ENGINE Rolls-Royce 250-C30 Perform engine inspection requirements.

  • Page 137: Weekly Inspection

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-32. WEEKLY INSPECTION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ Chapter 62, MAIN ROTOR HUB AND BLADES, AND TAIL ROTOR HUB...
  • Page 138 BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-32. WEEKLY INSPECTION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTE Do not allow preservative oil (C-125) to contact tail rotor blade bearings. Apply a light coat of preservative oil (C-125) to all hub and blade surfaces.

  • Page 139: 12-Month Inspection

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-33. 12-MONTH INSPECTION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ GENERAL Ensure that a 100 or 300-hour airframe progressive...

  • Page 141: 12 Months Of Component Operation

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-34. 12 MONTHS OF COMPONENT OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ Chapter 62...

  • Page 143: 24-Month Inspection

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-35. 24-MONTH INSPECTION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ MAIN ROTOR FLIGHT CONTROL BOLTS/NUTS...
  • Page 144 BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-35. 24-MONTH INSPECTION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER FUEL SYSTEM Chapter 28 Remove fuel boost pump assemblies and inspect fuel cell interiors for debris, water contamination, and fungus growth. Remove, clean, and inspect fuel manifold assembly.
  • Page 145 BHT-206L4-MM-1 Figure 5-2. Inspection of Main Rotor Flight Control Bolts/Nuts (Sheet 1 of 2) 5-00-00 Export Classification C, ECCN EAR99 7 NOV 2014 Rev. 20 Page 109...
  • Page 146 BHT-206L4-MM-1 Figure 5-2. Inspection of Main Rotor Flight Control Bolts/Nuts (Sheet 2 of 2) 5-00-00 Page 110 Rev. 20 7 NOV 2014 Export Classification C, ECCN EAR99...

  • Page 147: 60-Month Inspection

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-36. 60-MONTH INSPECTION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ BHT-206L4-MM FREEWHEEL ASSEMBLY BHT-206L-CR&O...

  • Page 149: 300-Hour Or 12-Month Inspection

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-37. 300-HOUR OR 12-MONTH INSPECTION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ NOTE This inspection is only applicable when conducting the 100-hour airframe progressive or 100-hour airframe periodic inspection program.

  • Page 151: 600-Hour Or 12-Month Inspection

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-38. 600-HOUR OR 12-MONTH INSPECTION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ Chapter 96...

  • Page 153: 1200 Hours Of Component Operation

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-39. 1200 HOURS OF COMPONENT OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ BHT-206L-CR&O MAIN ROTOR HUB ASSEMBLY lnspect yoke and trunnion bearing surfaces for brinelling.

  • Page 155: 1500 Hours Of Component Operation

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-40. 1500 HOURS OF COMPONENT OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ Chapter 63...

  • Page 156: Chapter 6

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-40. 1500 HOURS OF COMPONENT OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER TRANSMISSION NOTE This inspection applicable transmission assemblies that have been operated with MIL-PRF-7808 oil since new or since last overhaul. To increase the inspection interval to 2250 Hours or...

  • Page 157: 2250 Hours Or 60 Months Of Component Operation

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-41. 2250 HOURS OR 60 MONTHS OF COMPONENT OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________...

  • Page 158: Chapter 6

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-41. 2250 HOURS OR 60 MONTHS OF COMPONENT OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Reassemble the transmission. Chapter 63 Install the mast and swashplate assembly into the transmission assembly. Apply sealant, primer, and paint to the required areas.

  • Page 159: 3000 Hours Of Component Operation

    BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-42. 3000 HOURS OF COMPONENT OPERATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ BHT-206L-CR&O...
  • Page 160 BHT-206L4-MM-1 SCHEDULED INSPECTIONS 5-42. 3000 HOURS OF COMPONENT OPERATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Visually inspect accessible areas of input pinion duplex bearing, input pinion roller alignment bearing, and output shaft roller alignment bearing and race for roughness, spalling, scoring, pitting, flaking, broken or damaged retainers, and for evidence of overheating and corrosion.
  • Page 161 BHT-206L4-MM-1 SPECIAL INSPECTIONS 5-43. SPECIAL INSPECTIONS • 1 to 5 hours after each installation • 3 to 8 hours after each installation Accomplish the following special inspections on the helicopter (paragraph 5-44 through paragraph 5-48): • 10 to 25 hours after each installation •...

  • Page 163: After Fuel System Maintenance And/Or Component Change

    BHT-206L4-MM-1 SPECIAL INSPECTIONS 5-44. AFTER FUEL SYSTEM MAINTENANCE AND/OR COMPONENT CHANGE INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________...
  • Page 164 BHT-206L4-MM-1 SPECIAL INSPECTIONS 5-44. AFTER FUEL SYSTEM MAINTENANCE AND/OR COMPONENT CHANGE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 12 a. Make sure all fuel has been drained from aft and forward fuel cells. b. Service fuel cell with 10 gallons (37.9 L) of fuel.
  • Page 165 BHT-206L4-MM-1 SPECIAL INSPECTIONS 5-44. AFTER FUEL SYSTEM MAINTENANCE AND/OR COMPONENT CHANGE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Rolls-Royce 250-C30 c. Purge air from fuel system and accomplish pneumatic Series Operation and leak check. Maintenance Manual, 14W2 5-00-00 25 FEB 2011 Rev.

  • Page 167: To 5 Hours After Each Installation

    BHT-206L4-MM-1 SPECIAL INSPECTIONS 5-45. 1 TO 5 HOURS AFTER EACH INSTALLATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________...

  • Page 169: To 8 Hours After Each Installation

    BHT-206L4-MM-1 SPECIAL INSPECTIONS 5-46. 3 TO 8 HOURS AFTER EACH INSTALLATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ MAIN ROTOR BHT-206L-CR&O...

  • Page 171: 10 To 25 Hours After Each Installation

    BHT-206L4-MM-1 SPECIAL INSPECTIONS 5-47. 10 TO 25 HOURS AFTER EACH INSTALLATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________...

  • Page 172: Chapter 6

    BHT-206L4-MM-1 SPECIAL INSPECTIONS 5-47. 10 TO 25 HOURS AFTER EACH INSTALLATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Chapter 65 TAIL ROTOR GEARBOX Torque check tail rotor gearbox retaining nuts 50 to 70 inch-pounds (5.6 to 7.9 Nm). Repeat every 10 to 25 hours until torque has stabilized.

  • Page 173: 100 Hours After Each Installation

    BHT-206L4-MM-1 SPECIAL INSPECTIONS 5-48. 100 HOURS AFTER EACH INSTALLATION INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ POWER PLANT...
  • Page 174 BHT-206L4-MM-1 SPECIAL INSPECTIONS 5-48. 100 HOURS AFTER EACH INSTALLATION (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTE If a nut is improperly torqued, remove and check tare torque, and replace as required. Recheck torque at next 100 hours.

  • Page 175: Conditional Inspections

    BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-49. CONDITIONAL INSPECTIONS • Overspeed — Main rotor — 114% or greater • Overtorque Accomplish the applicable conditional inspections (paragraph 5-50 through paragraph 5-57) of the • Engine compressor stall or surge helicopter after the following: •...

  • Page 177: Hard Landing

    Bell Helicopter Textron approved blade repair station for inspection. The airframe landing skids and crosstubes will deform and yield under load forces in excess of 2.5 G's.
  • Page 178 BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-50. HARD LANDING (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTE Components removed from helicopter for evaluation following a hard landing shall be evaluated as an interrelated group. Removal records accompanying each component shall cross-reference part and serial numbers of other drive system components removed for evaluation.
  • Page 179 BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-50. HARD LANDING (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER a. Remove and inspect suspected control tube for straightness by rolling on a surface plate or with use of a metal straight edge. On fixed control tubes the swaged end must be concentric to tube within 0.06 inch (1.5 mm) Total Indicated...
  • Page 180 If deformation or cracks are found, discard the driveshaft. d. Transmission restraint. e. Remove main rotor blades and send to a Bell Helicopter Textron approved blade repair facility for evaluation. 17. lnspect engine mounts at fuselage attachment points for cracks.
  • Page 181 Tail rotor hub and blade assembly. j. Transmission restraint and mount systems. k. Remove main rotor blades and send to a Bell Helicopter Textron approved blade repair facility for evaluation. l. Replace all control bolts from hydraulic servo actuator to the main rotor hub.
  • Page 182 BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-50. HARD LANDING (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER BHT-206L4-FM-1 24. Provided no visual damage is found, start engine and check main rotor for evidence of 1/rev vibration and lateral balance while at flat pitch.

  • Page 183: Sudden Stoppage/Acceleration - Main Rotor

    BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-51. SUDDEN STOPPAGE/ACCELERATION — MAIN ROTOR INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ SUDDEN STOPPAGE/ACCELERATION...
  • Page 184 MECH OTHER After sudden stoppage of the main rotor, remove both main rotor blades. Send blades to a Bell Helicopter Textron approved blade repair facility for evaluation. Remove the following components and visually inspect for evidence of torsional yielding, deformation, cracks, or other obvious damage that would render them non-repairable.
  • Page 185 BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-51. SUDDEN STOPPAGE/ACCELERATION — MAIN ROTOR (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER CAUTION IF M A IN ROTOR M AS T HAS EV IDE NCE OF TORSIONAL YIELDING, THE MAST ASSEMBLY, TRANSMISSION ASSEMBLY, MAIN DRIVESHAFT,...
  • Page 186 BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-51. SUDDEN STOPPAGE/ACCELERATION — MAIN ROTOR (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER BHT-206L-CR&O h. Main driveshaft must be considered unserviceable and scrapped. i. lnspect transmission restraint and transmission mount system for condition, and fuselage attachment points for cracks.
  • Page 187 BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-51. SUDDEN STOPPAGE/ACCELERATION — MAIN ROTOR (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER a. Any impact damage to a main rotor blade leading edge or lower skin, or any main rotor blade skin buckling or tears.

  • Page 189: Sudden Stoppage/Acceleration - Tail Rotor

    BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-52. SUDDEN STOPPAGE/ACCELERATION — TAIL ROTOR INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ SUDDEN STOPPAGE/ACCELERATION...
  • Page 190 BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-52. SUDDEN STOPPAGE/ACCELERATION — TAIL ROTOR (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Overhaul the following components: a. Tail rotor gearbox assembly. b. Freewheel assembly. c. Tail rotor pitch change mechanism. BHT-ALL-SPM Inspect all tail rotor driveshafts, impeller, steel and BHT-206L-CR&O...
  • Page 191 BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-52. SUDDEN STOPPAGE/ACCELERATION — TAIL ROTOR (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER In addition ALL bonded tail rotor driveshafts shall be considered unserviceable and scrapped, if during a sudden stoppage inspection any of the following conditions that are attributable to the sudden stoppage are noted: a.

  • Page 193: Overspeed Main Rotor - 114% Or Greater

    BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-53. OVERSPEED MAIN ROTOR — 114% OR GREATER INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ OVERSPEED MAIN ROTOR —...
  • Page 194 0.0015 inch (0.0381 mm), remove blade from service and return it to a Bell Helicopter Textron approved major overhaul facility for further inspection. Any evident looseness of bushing is cause for scrapping blade.

  • Page 195: Chapter 6

    BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-53. OVERSPEED MAIN ROTOR — 114% OR GREATER (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER BHT-206L-CR&O d. Overhaul the main rotor hub assembly in accordance with the Conditional Inspection criteria. BHT-206A/B/L-Series- e. Overhaul the tail rotor hub assembly.

  • Page 197: Overtorque

    BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-54. OVERTORQUE INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ NOTE Torque Indicator Reference: 100% = 71.4 PSI, 110% = 78.5 PSI, 120% = 85.7 PSI.

  • Page 198: Chapter 6

    OTHER (1) Main rotor blades and attachments. Blade for skin wrinkles and bond separation. If any indications of wrinkles or deformation exists, send blades to a Bell Helicopter Textron approved blade repair facility for evaluation. (2) Main rotor hub assembly.
  • Page 199 BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-54. OVERTORQUE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER Rolls-Royce 250-C30 Refer to the Rolls-Royce 250-C30 Series Operational and Series Operation and Maintenance Manual for applicable inspection. Maintenance Manual, 14W2 After the first 25 hours following an overtorque, conduct a thorough visual inspection of the following: a.
  • Page 200 BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-54. OVERTORQUE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER NOTE The overhaul inspection criteria in the specific sections, including limit charts and other pertinent information, should be used to establish that the detail parts in each assembly are dimensionally within limits and have not yielded or become deformed.
  • Page 201 BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-54. OVERTORQUE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER e. Transmission spindles, pylon support links, and mount fittings. f. Cabin roof shell and beam at transmission mount attachment points. g. Transmission restraint attachment. h. Transmission electric chip detectors.

  • Page 203: Engine Compressor Stall Or Surge

    BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-55. ENGINE 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...

  • Page 204: Chapter 7

    Examine the compressor rotor for contamination. If contamination is found, perform a compressor wash. Refer to applicable BHT-206L4-MM-9, Chapter 71. b. Inspect compressor rotor for foreign object damage in accordance with the appropriate Rolls-Royce Operation and Maintenance Manual for proper action.

  • Page 205: Chapter 6

    Make an entry on the applicable components Historical Service Record and attach a tag and write, “THIS COMPONENT WAS REMOVED FROM SERVICE BECAUSE OF A COMPRESSOR STALL/SURGE”. Send the component to a Bell Helicopter Textron approved facility for overhaul. Examine the tail rotor driveshafts for condition and security of attachment.

  • Page 206: Chapter 6

    "THIS BLADE WAS REMOVED FROM SERVICE BECAUSE OF A COMPRESSOR STALL OR SURGE". Send the tail rotor blade(s) assembly to a Bell Helicopter Textron approved rotor blade repair facility for further inspection and repair. Examine the tail rotor blade bolts for security of attachment.
  • Page 207 Record and attach a tag on the main rotor hub and write, "THIS MAIN ROTOR HUB ASSEMBLY WAS REMOVED FROM SERVICE BECAUSE OF A COMPRESSOR STALL/SURGE." Send the component to a Bell Helicopter Textron approved facility for overhaul. If no defects were detected on main rotor hub, the main rotor hub is serviceable.
  • Page 208 Historical Service Record and attach a tag on the driveshaft and write, “THIS COMPONENT WAS REMOVED FORM SERVICE BECAUSE OF A COMPRESSOR STALL”. Send the driveshaft to Bell Helicopter Textron CPR for evaluation. defects were...

  • Page 209: Chapter 6

    “THIS COMPONENT WAS REMOVED FROM SERVICE BECAUSE OF A COMPRESSOR STALL”. Send the tail rotor gearbox to a Bell Helicopter Textron approved facility for overhaul. If no defects were detected on the gears, the tail rotor gearbox is serviceable.
  • Page 210 Historical Service Record and attach a tag and write, “THIS COMPONENT WAS REMOVED FROM SERVICE BECAUSE OF A COMPRESSOR STALL/SURGE”. Send the component to a Bell Helicopter Textron approved facility for overhaul. If no metal particles were found, the transmission assembly, freewheel assembly, and/or tail rotor gearbox are serviceable.

  • Page 211: Lightning Strike

    BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-56. LIGHTNING STRIKE INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ NOTE This inspection must...
  • Page 212 Inspect main rotor blades. Blades that exhibit severe arcing shall be scrapped. Blades that exhibit light to moderate arcing shall be returned to a Bell Helicopter Textron approved blade repair facility for evaluation. (1) Inspect blades for signs of burns and arcing at tip cap, root end closure, buffer pads, and blade bolt bushings.
  • Page 213 BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-56. LIGHTNING STRIKE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER e. Inspect nodal beam, transmission mount fittings, and engine mounts. BHT-206L-CR&O (1) Visually inspect exterior surfaces for evidence of arcing or burning. Special attention should be given to contact surfaces of transmission and engine to their mounting systems, and of mounting systems to the airframe.
  • Page 214 BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-56. LIGHTNING STRIKE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER (2) Visually check pitch horns and trunnion bearing connections for arcing burns. BHT-206L-CR&O (3) If indications of arcing or burning are present, overhaul main rotor hub assembly and scrap pitch links and all attaching hardware.
  • Page 215 BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-56. LIGHTNING STRIKE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER d. Inspect nodal beam, transmission mount fittings, and engine mounts. (1) Visually inspect exterior surfaces for evidence of arcing or burning. Special attention should be given to contact surfaces of transmission and engine to their mounting systems, and of mounting systems to the airframe.
  • Page 216 BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-56. LIGHTNING STRIKE (CONT) INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER BHT-206L-CR&O (1) If indications of arcing or burning are present or bearings do not rotate smoothly, overhaul swashplate assembly. Replace the affected hardware. BHT-206L-CR&O (2) If no indications are found, reassemble the swashplate assembly and return to service.

  • Page 217: Engine Overtemp

    BHT-206L4-MM-1 CONDITIONAL INSPECTIONS 5-57. ENGINE OVERTEMP INITIAL DATA REFERENCE INSPECTION TASK DESCRIPTION MECH OTHER DATE: __________________W.O. _____________________ FACILITY: _________________ _ ________________________ HELICOPTER S/N: __________ _ ________________________ REGISTRY NO.: ____________ _ ________________________ TOTAL TIME:_______________________________________ SIGNATURE:_______________ _ ________________________ ENGINE OVERTEMP — Inspect.

  • Page 219: Component Overhaul Schedule

    BHT-206L4-MM-1 COMPONENT OVERHAUL SCHEDULE 5-58. COMPONENT OVERHAUL SCHEDULE CAUTION The Component Overhaul Schedule (Table 5-4) provides the time interval between overhaul for each applicable helicopter component. OVERHAUL SCHEDULE FOR SOME KIT COMPONENTS AND/OR PARTS IS NOT COVERED IN THIS SCHEDULE. REFER...
  • Page 220 Input driveshafts 206-340-300-101/-105 must be overhauled at 5000 hours of operation and every 2500 hours of operation thereafter. Overhaul is to be accomplished by Kamatics Corporation only. Return driveshaft to Bell Helicopter Textron (BHT) per Information Letter (IL) GEN-04-98. 5-00-00 Page 184 Rev.

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