Helicopter Drive System on-Condition Maintenance Capability (UH-1/AH-1)
Final rept. Jul 1974-Jun 1975
BELL HELICOPTER TEXTRON INC FORT WORTH TX
Pagination or Media Count:
The objective of this study was to assess the capability of main transmissions, intermediate gearboxes, tail rotor gearboxes, main rotor hubs, and swashplates on the UH-1 and AH-1 to operate with no scheduled overhaul periods. Overhaul and accident records, inspection procedures, and the functional capability of the caution and warning subsystem and its condition- monitoring devices were examined, and failure mode, effects and criticality analyses were performed to determine if any part or assembly failure modes would limit on-condition maintenance capability. This report concludes that UH-1AH-1 helicopter drive system components have a capability for replacement for overhaul on an on-condition basis and that the overhaul intervals could be extended for some components or eliminated for others. The report includes recommendations for further study.