BELL HELICOPTER 430 User Manual

BHT-430-MM-2
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.
REISSUE — 30 JUNE 1999
REVISION 19 — 1 NOVEMBER 2012
COPYRIGHT NOTICE
COPYRIGHT 2012
BELL
® HELICOPTER TEXTRON INC.
AND BELL HELICOPTER TEXTRON
CANADA LTD.
ALL RIGHTS RESERVED
MAINTENANCE MANUAL
VOLUME 2
HANDLING AND SERVICING

BELL HELICOPTER 430 Specifications

General

Brand	BELL HELICOPTER
Model	430
Category	Toy
Language	English

Summary

MAINTENANCE MANUAL VOLUME 2 HANDLING AND SERVICING

NOTICE

Instructions supplement by bulletins and directives must be strictly followed.

PROPRIETARY RIGHTS NOTICE

DESTINATION CONTROL STATEMENT

WARNING

CUSTOMER SUPPORT AND SERVICES

Model 206 or 407

Contact information for Bell Model 206 and 407 support.

Model 222, 230, 427, 429, or 430

Contact information for Bell Model 222, 230, 427, 429, 430 support.

Model 204, 205, 212, or 412

Contact information for Bell Model 204, 205, 212, 412 support.

Model 214, 210, HUEY II and All Bell’s Active and Surplus Military Medium Helicopter Models

Contact information for Bell military medium helicopter models support.

Model OH-58, TH-67, TH-57, Both Active and Surplus Military

Contact information for Bell military OH-58, TH-67, TH-57 support.

HELP EVALUATE LOGISTICS PUBLICATIONS

CUSTOMER FEEDBACK

IMPORTANT HELICOPTER SALES NOTICE

SPARE PARTS WARRANTY

ONE YEAR/1,000 HOURS PRORATED

Details of the spare parts warranty, including coverage and limitations.

CHAPTER 4 — AIRWORTHINESS LIMITATIONS SCHEDULE

TABLE OF CONTENTS

Table of contents for Chapter 4, listing paragraphs, figures, and tables.

FIGURES

List of figures in Chapter 4 with titles and page numbers.

TABLES

List of tables in Chapter 4 with titles and page numbers.

REVISION NO. DATE OF SIGNATURE APPROVAL SIGNATURE

REVISION NO. DATE OF SIGNATURE APPROVAL SIGNATURE

4-1. AIRWORTHINESS LIMITATIONS SCHEDULE

WARNING

Warning about using parts or processes not approved by Bell Helicopter.

WARNING

Warning against exceeding time/calendar/RIN life limits for components.

Table 4-1. Airworthiness Limitations Schedule

COMPONENT PART NUMBER AIRWORTHINESS LIFE

Schedule of components with part numbers and their airworthiness life limits.

Table 4-1. Airworthiness Limitations Schedule (Cont)

MAIN ROTOR CONTROLS

Airworthiness limitations for main rotor control components.

CONTROL SYSTEM BOLTS AND PINS

Airworthiness limitations for control system bolts and pins.

Table 4-1. Airworthiness Limitations Schedule (Cont)

CONTROL SYSTEM BOLTS AND PINS (CONT)

Continued airworthiness limitations for control system hardware.

TAIL ROTOR AND CONTROLS

Airworthiness limitations for tail rotor components.

TRANSMISSION AND DRIVE SYSTEM

Airworthiness limitations for transmission and drive system parts.

PYLON SYSTEM

Airworthiness limitations for pylon system components.

FIRE PROTECTION SYSTEM

Airworthiness limitations for fire protection system components.

Table 4-1. Airworthiness Limitations Schedule (Cont)

NOTES:

Notes regarding airworthiness limitations for specific part numbers and components.

Table 4-2. Inspection Limitations Schedule

COMPONENT PART NUMBER INSPECTION INTERVAL (HOURS OPERATION TIME)

Schedule of components with part numbers and inspection intervals.

NOTES:

Notes regarding inspection limitations for specific parts and figures.

Figure 4-1. Main Rotor Yoke — 100-Hour and 600-Hour Inspection

NOTES

Notes for the main rotor yoke inspection, including damage criteria references.

Figure 4-2. Main Rotor Yoke Edges — Inspection

NOTE

Note for the main rotor yoke edges inspection, referencing damage criteria.

Figure 4-3. Pylon Fluid Mount — Inspection

NOTE

Note regarding applicability of inspection to specific part numbers.

NOTE

Note stating this inspection does not apply to a specific part number.

Figure 4-4. Main Rotor Yoke — 2500-Hour Inspection

NOTE

Note referencing damage criteria for main rotor yoke inspection.

Figure 4-5. Main Rotor Blade — Inspection

NOTE

Note referencing damage criteria for main rotor blade inspection.

Figure 4-6. Pylon Fluid Mount — Torque Shear Pad Bolt Replacement

NOTE

Note referencing the bolt replacement procedure.

CHAPTER 5 — INSPECTIONS AND COMPONENT OVERHAUL SCHEDULE

TABLE OF CONTENTS

Table of contents for Chapter 5, listing inspections and overhaul schedules.

INSPECTIONS

Section covering general, scheduled, special, and conditional inspections.

SCHEDULED INSPECTIONS

Details scheduled airframe and component inspection intervals.

TABLE OF CONTENTS (CONT)

SPECIAL INSPECTIONS

Lists special inspections performed after specific maintenance actions.

CONDITIONAL INSPECTIONS

Details unscheduled inspections triggered by unusual events.

COMPONENT OVERHAUL SCHEDULE

Provides overhaul intervals for various helicopter components.

FIGURES

List of figures in Chapter 5 with titles and page numbers.

TABLES

List of tables in Chapter 5 with titles and page numbers.

5-1. GENERAL

WARNING

Warning about the consequences of not correcting conditions found during inspections.

NOTE

Note regarding time periods for overhaul not constituting a warranty.

5-2. ITEMS NOT COVERED IN THE INSPECTIONS

Lists specific inspections not included in the manual, requiring regulatory authority input.

5-3. CRASH DAMAGE

5-4. TYPES OF INSPECTIONS

5-5. DEFINITIONS

5-6. INSPECTION AND OVERHAUL TOLERANCE

WARNING

Warning against applying tolerances to parts with limited airworthiness life.

Figure 5-1. Maintenance Zones

NOTE

5-7. SCHEDULED INSPECTIONS

5-8. SCHEDULED AIRFRAME INSPECTIONS

Details two scheduled airframe inspection programs for operator flexibility.

5-9. Airframe Periodic

Specifies periodic inspection intervals (50, 150, 600 hours) and frequency.

5-10. Airframe Progressive

Describes the progressive inspection program, divided into 12 events.

5-11. Inspection Program Selection

Guidance on selecting and changing between airframe inspection programs.

5-12. SCHEDULED COMPONENT INSPECTION

5-13. 50 HOUR INSPECTION

GENERAL:

General instructions for the 50-hour inspection.

NOTE

Recommendation to interrogate IIDS and ECU for fault codes during inspection.

5-13. 50 HOUR INSPECTION (CONT)

Rolls-Royce 250-C40B Operation and Maintenance Manual, Publication CSP 21000

Reference to engine inspection procedures.

Chapter 12

Reference to lubrication and service requirements.

5-13. 50 HOUR INSPECTION (CONT)

NOTE

Note on examining inspection windows for damage.

5-13. 50 HOUR INSPECTION (CONT)

5-14. 150 HOUR INSPECTION

GENERAL:

General instructions for the 150-hour inspection.

Rolls-Royce 250-C40B Operation and Maintenance Manual, Publication CSP 21000

Reference to engine inspection procedures.

Chapter 12

Reference to lubrication and service requirements.

5-14. 150 HOUR INSPECTION (CONT)

5-14. 150 HOUR INSPECTION (CONT)

NOTE

Note on examining inspection windows for damage.

NOTE

Note indicating a step is an airworthiness inspection limitation.

5-14. 150 HOUR INSPECTION (CONT)

NOTE

Note on examining inspection windows for damage.

5-14. 150 HOUR INSPECTION (CONT)

NOTE

Note on examining inspection windows for damage.

5-14. 150 HOUR INSPECTION (CONT)

5-14. 150 HOUR INSPECTION (CONT)

5-14. 150 HOUR INSPECTION (CONT)

5-14. 150 HOUR INSPECTION (CONT)

5-15. 600 HOUR/ANNUAL INSPECTION

DETAIL:

Detailed tasks for the 600-hour/annual inspection.

5-15. 600 HOUR/ANNUAL INSPECTION (CONT)

5-15. 600 HOUR/ANNUAL INSPECTION (CONT)

5-15. 600 HOUR/ANNUAL INSPECTION (CONT)

5-16. PROGRESSIVE INSPECTION — EVENT 1

GENERAL:

General instructions for Progressive Inspection Event 1.

DETAIL:

Detailed tasks for Progressive Inspection Event 1.

NOTE

Note on examining inspection windows for damage.

5-16. PROGRESSIVE INSPECTION — EVENT 1 (CONT)

5-16. PROGRESSIVE INSPECTION — EVENT 1 (CONT)

5-16. PROGRESSIVE INSPECTION — EVENT 1 (CONT)

5-17. PROGRESSIVE INSPECTION — EVENT 2

GENERAL:

General instructions for Progressive Inspection Event 2.

DETAIL:

Detailed tasks for Progressive Inspection Event 2.

NOTE

Note on examining inspection windows for damage.

5-17. PROGRESSIVE INSPECTION — EVENT 2 (CONT)

NOTE

Note indicating a step is an airworthiness inspection limitation.

5-17. PROGRESSIVE INSPECTION — EVENT 2 (CONT)

NOTE

Note on examining inspection windows for damage.

5-18. PROGRESSIVE INSPECTION — EVENT 3

GENERAL:

General instructions for Progressive Inspection Event 3.

DETAIL:

Detailed tasks for Progressive Inspection Event 3.

5-18. PROGRESSIVE INSPECTION — EVENT 3 (CONT)

5-18. PROGRESSIVE INSPECTION — EVENT 3 (CONT)

5-19. PROGRESSIVE INSPECTION — EVENT 4

GENERAL:

General instructions for Progressive Inspection Event 4.

DETAIL:

Detailed tasks for Progressive Inspection Event 4.

NOTE

Note on examining inspection windows for damage.

5-19. PROGRESSIVE INSPECTION — EVENT 4 (CONT)

5-19. PROGRESSIVE INSPECTION — EVENT 4 (CONT)

5-19. PROGRESSIVE INSPECTION — EVENT 4 (CONT)

5-19. PROGRESSIVE INSPECTION — EVENT 4 (CONT)

5-20. PROGRESSIVE INSPECTION — EVENT 5

GENERAL:

General instructions for Progressive Inspection Event 5.

DETAIL:

Detailed tasks for Progressive Inspection Event 5.

NOTE

Note on examining inspection windows for damage.

5-20. PROGRESSIVE INSPECTION — EVENT 5 (CONT)

5-20. PROGRESSIVE INSPECTION — EVENT 5 (CONT)

5-20. PROGRESSIVE INSPECTION — EVENT 5 (CONT)

NOTE

Note on examining inspection windows for damage.

5-21. PROGRESSIVE INSPECTION — EVENT 6

GENERAL:

General instructions for Progressive Inspection Event 6.

DETAIL:

Detailed tasks for Progressive Inspection Event 6.

5-21. PROGRESSIVE INSPECTION — EVENT 6 (CONT)

5-21. PROGRESSIVE INSPECTION — EVENT 6 (CONT)

5-22. PROGRESSIVE INSPECTION — EVENT 7

GENERAL:

General instructions for Progressive Inspection Event 7.

DETAIL:

Detailed tasks for Progressive Inspection Event 7.

NOTE

Note on examining inspection windows for damage.

5-22. PROGRESSIVE INSPECTION — EVENT 7 (CONT)

5-22. PROGRESSIVE INSPECTION — EVENT 7 (CONT)

5-22. PROGRESSIVE INSPECTION — EVENT 7 (CONT)

5-22. PROGRESSIVE INSPECTION — EVENT 7 (CONT)

5-23. PROGRESSIVE INSPECTION — EVENT 8

GENERAL:

General instructions for Progressive Inspection Event 8.

DETAIL:

Detailed tasks for Progressive Inspection Event 8.

NOTE

Note on examining inspection windows for damage.

5-23. PROGRESSIVE INSPECTION — EVENT 8 (CONT)

5-23. PROGRESSIVE INSPECTION — EVENT 8 (CONT)

NOTE

Note indicating a step is an airworthiness inspection limitation.

5-23. PROGRESSIVE INSPECTION — EVENT 8 (CONT)

NOTE

Note on examining inspection windows for damage.

5-24. PROGRESSIVE INSPECTION — EVENT 9

GENERAL:

General instructions for Progressive Inspection Event 9.

DETAIL:

Detailed tasks for Progressive Inspection Event 9.

5-24. PROGRESSIVE INSPECTION — EVENT 9 (CONT)

5-24. PROGRESSIVE INSPECTION — EVENT 9 (CONT)

5-25. PROGRESSIVE INSPECTION — EVENT 10

GENERAL:

General instructions for Progressive Inspection Event 10.

DETAIL:

Detailed tasks for Progressive Inspection Event 10.

NOTE

Note on examining inspection windows for damage.

5-25. PROGRESSIVE INSPECTION — EVENT 10 (CONT)

5-25. PROGRESSIVE INSPECTION — EVENT 10 (CONT)

5-25. PROGRESSIVE INSPECTION — EVENT 10 (CONT)

5-26. PROGRESSIVE INSPECTION — EVENT 11

DETAIL:

Detailed tasks for Progressive Inspection Event 11.

NOTE

Note on examining inspection windows for damage.

5-26. PROGRESSIVE INSPECTION — EVENT 11 (CONT)

NOTE

Note on examining inspection windows for damage.

5-26. PROGRESSIVE INSPECTION — EVENT 11 (CONT)

5-26. PROGRESSIVE INSPECTION — EVENT 11 (CONT)

NOTE

Note on examining inspection windows for damage.

5-27. PROGRESSIVE INSPECTION — EVENT 12

DETAIL:

Detailed tasks for Progressive Inspection Event 12.

5-27. PROGRESSIVE INSPECTION — EVENT 12 (CONT)

5-27. PROGRESSIVE INSPECTION — EVENT 12 (CONT)

CAUTION

Caution regarding foreign object damage to the engine compressor section.

5-27. PROGRESSIVE INSPECTION — EVENT 12 (CONT)

5-28. EVERY 100 HOURS OF COMPONENT OPERATION

SWASHPLATE CONTROLS

Inspection and lubrication of the swashplate assembly and controls.

NOTE

Note on examining the duplex bearing before lubrication.

MAIN ROTOR YOKES

Inspection of main rotor yokes for cracks.

NOTE

Note on airworthiness inspection limitation for yoke cracks.

5-28. EVERY 100 HOURS OF COMPONENT OPERATION (CONT)

NOTE

Note limiting inspection to yoke arms with specific crack sizes.

NOTE

Note stating main rotor blade removal is required for inspection.

5-29. EVERY 300 HOURS OF COMPONENT OPERATION

SWASHPLATE CONTROLS

Inspection of swashplate assembly and rotating controls for wear and play.

5-29. EVERY 300 HOURS OF COMPONENT OPERATION (CONT)

NOTE

Note on examining duplex bearing before lubrication.

NOTE

Note on applicability of inspection to specific swashplate configurations.

5-30. EVERY 600 HOURS OR 6 MONTHS OF COMPONENT OPERATION

ENGINE FIRE EXTINGUISHER AND CARTRIDGE

Inspection of engine fire extinguishers for damage and operational check.

5-31. EVERY 600 HOURS OR 12 MONTHS OF COMPONENT OPERATION

MAIN DRIVESHAFT

Examination and lubrication of main driveshafts.

TAIL ROTOR DRIVESHAFT

Examination and lubrication of tail rotor driveshaft flexible coupling.

5-32. EVERY 600 HOURS OF COMPONENT OPERATION

ENGINE STARTER-GENERATOR

Examination of engine starter-generator brushes for wear.

PYLON FLUID MOUNTS

Inspection of pylon fluid mounts, including removal and dye penetrant inspection.

NOTE

Note on airworthiness inspection limitations for pylon fluid mounts.

5-32. EVERY 600 HOURS OF COMPONENT OPERATION

MAIN ROTOR YOKES

Inspection of main rotor yokes for cracks, delamination, and damage.

NOTE

Note on airworthiness inspection limitations for main rotor yokes.

5-33. EVERY 1200 HOURS OF COMPONENT OPERATION

HYDRAULIC PUMP SPLINES

Inspection of hydraulic pump and transmission adapter gear splines for wear.

SWASHPLATE ASSEMBLY

Inspection of swashplate bushings and pivot pins for fretting, corrosion, and damage.

5-33. EVERY 1200 HOURS OF COMPONENT OPERATION (CONT)

NOTE

Note on consequences of cracks in swashplate assembly pins/bushings.

5-34. EVERY 2500 HOURS OF COMPONENT OPERATION

MAIN ROTOR BLADES

Inspection of main rotor blades for delamination and damage.

NOTE

Note on airworthiness inspection limitation for main rotor blades.

MAIN ROTOR YOKES

Inspection of main rotor yokes for cracks, delamination, and damage.

NOTE

Note on airworthiness inspection limitation for main rotor yokes.

5-34. EVERY 2500 HOURS OF COMPONENT OPERATION (CONT)

PYLON SYSTEM

Replacement of torque shear pad attaching bolts for pylon system.

NOTE

Note on airworthiness inspection limitation for bolt replacement.

5-35. EVERY 6 MONTHS

STANDBY ATTITUDE INDICATOR

Testing the pilot standby attitude indicator power supply.

5-36. EVERY 2 CALENDAR YEARS

SWASHPLATE AND CONTROLS

Inspection of flight control bolts, including removal and examination.

NOTE

Note on frequent examination of control bolts in adverse conditions.

5-36. EVERY 2 CALENDAR YEARS (CONT)

MAIN ROTOR MAST

Examination of the main rotor mast for internal and external corrosion.

5-36. EVERY 2 CALENDAR YEARS (CONT)

INSTRUMENTS

Draining moisture from pitot-static system pipes.

VERTICAL FIN

Removal and inspection of the vertical fin and tailboom fittings.

CAUTION

Caution regarding torque application after sealant application.

5-36. EVERY 2 CALENDAR YEARS (CONT)

CAUTION

Caution referencing correct torque procedures.

5-37. EVERY 3 CALENDAR YEARS

EMERGENCY FLOTATION SYSTEM

Hydrostatic testing of the emergency flotation system nitrogen reservoir.

NOTE

Note on applicability of inspection to specific reservoir manufacturing dates.

5-38. EVERY 5 CALENDAR YEARS

FIRE EXTINGUISHER RESERVOIR

Hydrostatic testing of fire extinguisher reservoirs.

NOTE

Note regarding replacement schedule for squibs.

EMERGENCY FLOTATION SYSTEM

Hydrostatic testing of emergency flotation system nitrogen reservoir.

NOTE

Note on applicability of inspection to specific reservoir manufacturing dates.

5-39. SPECIAL INSPECTIONS

Main Rotor Yokes — After every main rotor blade removal

Inspection of main rotor yokes after each main rotor blade removal.

Main Rotor Yokes — After 1 to 5 hours of operation following each installation

Torque verification for main rotor yokes after installation.

Tail Rotor — After 1 to 5 hours of operation following each installation

Torque verification for tail rotor hub assembly after installation.

5-40. AFTER EVERY MAIN ROTOR BLADE REMOVAL

MAIN ROTOR YOKES

Inspection of main rotor yokes after blade removal for cracks and damage.

NOTE

Note on airworthiness inspection limitation for yoke inspection.

5-41. AFTER 1 TO 5 HOURS OF OPERATION FOLLOWING EACH INSTALLATION

MAIN ROTOR YOKES

Torque verification for main rotor yokes after installation.

TAIL ROTOR

Torque verification for tail rotor hub assembly after installation.

5-42. AFTER 5 TO 10 HOURS OF OPERATION FOLLOWING EACH INSTALLATION

VERTICAL FIN

Torque verification for vertical fin attach bolts/nuts after installation.

CAUTION

Caution referencing correct torque procedures.

TAIL ROTOR HUB AND BLADES

Torque verification for tail rotor blades attaching bolts/nuts after installation.

HYDRAULIC ACTUATOR SUPPORT

Torque verification for hydraulic actuator support attaching nuts after installation.

5-43. AFTER 25 HOURS OF OPERATION FOLLOWING EACH INSTALLATION

SWASHPLATE

Verification of swashplate friction adjustment after initial installation.

5-44. AFTER 100 HOURS OF OPERATION FOLLOWING EACH INSTALLATION

TAIL ROTOR GEARBOX

Torque verification of tail rotor gearbox retaining nuts.

5-45. CONDITIONAL INSPECTIONS

5-46. HARD LANDING

5-46. HARD LANDING (CONT)

NOTE

Note on considering loads if cabin fuselage shows signs of ground contact.

NOTE

Note on inspecting landing gear assembly further if wheel is deformed or cracked.

5-46. HARD LANDING (CONT)

NOTE

Note on examining wing attach fittings and main beams if landing gear fittings are damaged.

NOTE

Note on further inspection of landing gear if shock strut leaks fluid.

5-46. HARD LANDING (CONT)

5-46. HARD LANDING (CONT)

5-46. HARD LANDING (CONT)

5-47. SUDDEN STOPPAGE — POWER ON OR OFF

5-47. SUDDEN STOPPAGE — POWER ON OR OFF (CONT)

Main rotor blades:

Examination of main rotor blades for damage and potential overhaul.

Main rotor yokes:

Inspection of main rotor yokes for damage following blade damage.

5-47. SUDDEN STOPPAGE — POWER ON OR OFF (CONT)

Main rotor controls:

Overhaul requirements for swashplate, drive hub, etc., based on discrepancies.

Main driveshafts:

Examination and overhaul of main driveshafts if bent or deformed.

5-47. SUDDEN STOPPAGE — POWER ON OR OFF (CONT)

Engine mounts:

Inspection of engine mounts for cracks or damage following a severe stoppage.

Transmission and mast assembly:

Procedures for mast and transmission overhaul or scrap based on damage.

Tail rotor driveshaft system:

Examination of tail rotor driveshafts for distortion, cracks, or damage.

5-47. SUDDEN STOPPAGE — POWER ON OR OFF (CONT)

Tail rotor driveshafts:

Detailed examination of tail rotor driveshafts and associated components.

Tail rotor hub and blade assembly:

Overhaul or replacement of tail rotor hub/blades based on stoppage cause.

5-47. SUDDEN STOPPAGE — POWER ON OR OFF (CONT)

Tail rotor driveshafts:

Continued examination of tail rotor driveshafts and hanger support structure.

5-47. SUDDEN STOPPAGE — POWER ON OR OFF (CONT)

Tail rotor gearbox:

Examination and overhaul of tail rotor gearbox for damage.

5-47. SUDDEN STOPPAGE — POWER ON OR OFF (CONT)

(3) Examine the transmission lower case duplex bearing.

Examination and replacement of transmission lower case duplex bearing.

(4) Examine the center bearing case roller bearing.

Examination and replacement of center bearing case roller bearing.

(5) Do an overhaul of the tail rotor drive quill.

Overhaul of the tail rotor drive quill.

5-48. OVERTORQUE

NOTE

Note on required action for overtorque within 100-105% limits.

5-48. OVERTORQUE (CONT)

5-48. OVERTORQUE (CONT)

(1) If the chip detectors and external filter are normal...

Procedures for checking transmission and filter after overtorque.

c. At 25 hours after an overtorque, do a thorough visual inspection...

Visual inspection of systems 25 hours after an overtorque.

2. When an overtorque is more than 115%, do the steps that follow:

Procedures for overtorque exceeding 115%.

5-48. OVERTORQUE (CONT)

b. Do an overhaul of the components that follow.

Overhaul requirements for components following overtorque.

NOTE

Note on main transmission overhaul and outboard quill requirements.

NOTE

Note on verifying engine history and self-testing IIDS/FADEC.

5-48. OVERTORQUE (CONT)

c. Do a thorough visual inspection of the components that follow.

Visual inspection of components, may remain in service if no damage found.

d. 25 hours after an overtorque, do a thorough inspection of the systems that follow:

25-hour inspection of systems following an overtorque.

5-49. ONE ENGINE INOPERATIVE (OEI)

NOTE

Information on OEI events recorded by IIDS and engine data.

1. When an OEI event has been recorded, perform the following:

Procedures to perform when an OEI event is recorded.

NOTE

Note on FADEC system self-testing.

5-49. ONE ENGINE INOPERATIVE (OEI) (CONT)

NOTE

Note on OEI overtorque conditions and torque limits.

NOTE

Definition of OEI overtorque incidents and their parameters.

2. When an OEI overtorque occurs, do the steps that follow:

Procedures to follow when an OEI overtorque occurs.

5-49. ONE ENGINE INOPERATIVE (OEI) (CONT)

b. Record the length of time and the maximum engine torque...

Recording engine torque and duration for OEI events.

c. Download engine history data from ECU using the MT35 program...

Downloading and reviewing engine history data including FADEC faults.

d. Perform engine overtorque inspection as required.

Performing engine overtorque inspection as needed.

e. Disassemble the main transmission and do an overhaul inspection...

Disassembly and overhaul of main transmission subassemblies after OEI.

f. Do an overhaul of the "power on" side main driveshaft.

Overhaul of the "power on" side main driveshaft after OEI.

5-50. LIGHTNING STRIKE

NOTE

Note on expanding inspection area if significant airframe damage is found.

1. Examine all of the external surfaces of the helicopter.

General examination of helicopter external surfaces and systems for lightning strike damage.

2. If you find damage to the helicopter, do the steps that follow:

Steps to follow if lightning strike damage is found.

5-50. LIGHTNING STRIKE (CONT)

b. Examine the main rotor yokes, elastomers, bearings, pitch links...

Examining rotor components for burns or arching signs.

c. Remove the transmission and mast assembly for overhaul.

Transmission and mast assembly overhaul due to lightning strike.

d. Remove the swashplate, drive hub, idler link and drive link for an overhaul.

Swashplate, drive hub, etc. overhaul due to lightning strike.

e. Remove the tail rotor hub for overhaul.

Tail rotor hub overhaul due to lightning strike.

f. Remove the tail rotor driveshaft bearing hangers and the tail rotor gearbox...

Overhaul of tail rotor driveshaft components due to lightning strike.

g. Examine the auxiliary fins for signs of burns or that they are debonded.

Examining auxiliary fins for burns or debonding.

h. Examine the tailboom fitting for signs of arc burns...

Examining tailboom fitting for arc burns near gearbox and vertical fin.

3. If you can not find any signs of damage:

Actions if no lightning strike damage is found.

5-50. LIGHTNING STRIKE (CONT)

(4) Assemble the main rotor if you did not find any damage.

Assembling the main rotor if no damage is found.

b. Remove the main rotor mast assembly.

Examining main rotor mast bearing and spline for electrical arc signs.

(1) If you find signs of arcs or burns on the bearing or if the bearing turns roughly...

Transmission and mast overhaul due to bearing damage.

(2) If you can not find any signs of damage, assemble the transmission and mast assembly...

Post-inspection procedures for transmission and mast assembly.

c. Remove the output quill assembly from the tail rotor gearbox.

Examining tail rotor gearbox output quill for electrical arc signs.

(1) If you find arcs or burns on the bearing or if the bearing turns roughly...

Gearbox overhaul due to bearing damage.

(2) If you can not find any signs of damage, assemble the gearbox and return it to limited service.

Post-inspection procedures for gearbox and chip detectors.

5-51. OVERSPEED

1. If the main rotor speed goes above 109%, but not more than 120%, visually examine the following components.

Visual inspection of components for overspeed between 109-120%.

5-51. OVERSPEED (CONT)

(4) If the retention bushings are loose, scrap the blade.

Action for loose retention bushings on blades.

(5) If the skin on any blade is wrinkled or deformed scrap all the blades.

Action for wrinkled or deformed blade skin.

(6) If the blades pass the above inspection the blade can be returned to service.

Return to service criteria for blades after inspection.

h. Tail rotor controls.

Inspection of tail rotor controls.

i. Main transmission.

Inspection of main transmission.

j. Main driveshafts.

Inspection of main driveshafts.

k. Examine the torque of the tail rotor gearbox attachment nuts.

Torque check of tail rotor gearbox attachment nuts.

2. If the main rotor overspeed goes above 120% remove and overhaul the components that follow.

Component removal and overhaul for overspeed exceeding 120%.

5-52. COMPRESSOR STALL OR SURGE

1. Power plant:

Power plant inspection, including FOD screen and impeller blades.

a. Examine the inlet FOD screen or the particle separator (if installed) for blockage.

Checking inlet screen and separator for blockage.

b. Examine the compressor impeller blades for accumulation of dirt, erosion or foreign object damage.

Inspecting compressor impeller blades for contamination or damage.

(1) If the blades are found contaminated, clean them and do a power check.

Cleaning contaminated blades and performing a power check.

(2) If the erosion or foreign object damage is more than the accepted limits, do a tear down inspection.

Tear down inspection for erosion or FOD exceeding limits.

c. If the compressor stall or surge happened during acceleration, refer to the engine maintenance manual.

Referencing engine manual for stalls during acceleration.

5-52. COMPRESSOR STALL OR SURGE (CONT)

d. If step a through step c do not determine the cause of the surge, examine the turbine assembly, refer to the engine maintenance manual.

Examining turbine assembly if surge cause is undetermined.

2. Power train:

Power train inspection, including chip detectors and gearbox contact patterns.

5-52. COMPRESSOR STALL OR SURGE (CONT)

(3) Tail rotor driveshaft flexible disc assemblies.

Inspection of tail rotor driveshaft flexible disc assemblies.

(4) Tail rotor driveshafts.

Inspection of tail rotor driveshafts.

(5) Replace any unserviceable parts.

Replacing unserviceable parts.

3. Rotating controls:

Visual inspection and replacement of unserviceable rotating control parts.

4. Tail rotor hub and blades:

Inspection and overhaul of tail rotor hub and blades for damage.

5. Main rotor and blades:

Inspection of main rotor yokes and blades for deformation or damage.

6. Airframe:

Inspection of airframe components for loose rivets or cracks.

5-53. COMPONENT OVERHAUL SCHEDULE

WARNING

Warning against applying tolerances to parts with limited airworthiness life.

WARNING

Warning not to exceed retirement life for critical components.

CAUTION

Caution regarding overhaul schedules for kit components.

NOTE

Note regarding inspection and overhaul tolerances.

NOTE

Note that overhaul assignment does not constitute a warranty.

Table 5-2. Component Overhaul Schedule

Schedule detailing overhaul intervals for helicopter components.

ROTORS

Overhaul intervals for rotor components.

Table 5-2. Component Overhaul Schedule (Cont)

POWER TRAIN

Overhaul intervals for power train components.

HYDRAULICS

Overhaul intervals for hydraulic components.

NOTES:

Notes on operating time, interim inspections, and bearing replacement for overhaul schedule.

Table 5-2. Component Overhaul Schedule (Cont)

NOTES (CONT):

Additional notes regarding hanger assembly overhaul and interim transmission inspections.

Table 5-3. Tail Rotor Driveshaft Hanger Bearing Assembly

NOMENCLATURE PART NUMBER

Table detailing tail rotor driveshaft hanger bearing assemblies and part numbers.

NOTES:

Notes on bearing replacement, shelf life, tagging, and overhaul requirements.