AD 87-18-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD Helicopters, Inc. | 369D | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (Hughes Helicopters, Inc.) Model 369D, E, F, and FF Helicopters |
| aircraft | MD Helicopters, Inc. | 369E | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (Hughes Helicopters, Inc.) Model 369D, E, F, and FF Helicopters |
| aircraft | MD Helicopters, Inc. | 369F | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (Hughes Helicopters, Inc.) Model 369D, E, F, and FF Helicopters |
| aircraft | MD Helicopters, Inc. | 369FF | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (Hughes Helicopters, Inc.) Model 369D, E, F, and FF Helicopters |
Unsafe Condition
Possible loss of tail rotor control due to potential cracking in the main transmission tail rotor output drive pinion shaft (P/N 369D25125-BSC or -11).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a one-time magnetic particle and visual inspection on the pinion shaft within specified timeframes. Remove shafts with non-compliant fillet radius, cracks, or defects from service before further flight. Rework discrepant shafts without cracks as per MDHC procedures.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 25 hours' time-in-service after September 1, 1987, for transmissions with specified serial numbers; within 100 hours' time-in-service for others.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
MD Helicopters, Inc. Models 369D, E, F, FF with main transmission (P/N 369D25100-BSC or -501) and tail rotor output drive pinion shaft (P/N 369D25125-BSC or -11). Transmission serial numbers include 1989, 1992, 1993, 1998-2000, 2002-2082, 2084, 2085. Pinion shaft serial numbers 1474-1502, 1504-1547, 1549-1561, 1563-1564, 1566 are subject to immediate removal.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.