AD 86-20-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD Helicopters, Inc. | 369 | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (Hughes Helicopters, Inc.) Model 369, 369A, 369D, 369E, 369H, 369HE, 369HM, and 369HS Helicopters |
| aircraft | MD Helicopters, Inc. | 369A | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (Hughes Helicopters, Inc.) Model 369, 369A, 369D, 369E, 369H, 369HE, 369HM, and 369HS Helicopters |
| aircraft | MD Helicopters, Inc. | 369D | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (Hughes Helicopters, Inc.) Model 369, 369A, 369D, 369E, 369H, 369HE, 369HM, and 369HS Helicopters |
| aircraft | MD Helicopters, Inc. | 369E | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (Hughes Helicopters, Inc.) Model 369, 369A, 369D, 369E, 369H, 369HE, 369HM, and 369HS Helicopters |
| aircraft | MD Helicopters, Inc. | 369H | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (Hughes Helicopters, Inc.) Model 369, 369A, 369D, 369E, 369H, 369HE, 369HM, and 369HS Helicopters |
| aircraft | MD Helicopters, Inc. | 369HE | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (Hughes Helicopters, Inc.) Model 369, 369A, 369D, 369E, 369H, 369HE, 369HM, and 369HS Helicopters |
| aircraft | MD Helicopters, Inc. | 369HM | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (Hughes Helicopters, Inc.) Model 369, 369A, 369D, 369E, 369H, 369HE, 369HM, and 369HS Helicopters |
| aircraft | MD Helicopters, Inc. | 369HS | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (Hughes Helicopters, Inc.) Model 369, 369A, 369D, 369E, 369H, 369HE, 369HM, and 369HS Helicopters |
Unsafe Condition
Failure of the tail rotor drive shaft system and subsequent loss of tail rotor control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install aft coupling failsafe device (P/N 369D25530 bolt and 369D25531 socket) within 100 hours' time in service after the effective date. Install forward coupling failsafe device (P/N 369D25530 bolt and 369D25531 socket) within 100 hours' time in service after the effective date. Perform preflight and shutdown checks for T/R backlash or looseness, and inspect/replace couplings if limits exceeded.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 100 hours' time in service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
MCDONNELL DOUGLAS HELICOPTER COMPANY (Hughes Helicopters, Inc.) Models 369, 369A, 369D, 369E, 369H, 369HE, 369HM, and 369HS helicopters, including military Models YOH-6A and OH-6A, equipped with tail rotor drive shaft flexible couplings Part Number 369A5501 or 369H92564.
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
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