AD 88-17-09 R1
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
Failure of the tail rotor transmission mounting studs (P/N MS51992A803-13 or -14) on MDHC Model 369 D/E helicopters or failure of the tail boom extension mounting studs (P/N MS51992A803-13 or -14) on MDHC Model 369 F/FF helicopters due to relative motion between the parts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct initial inspections prior to further flight after the effective date, followed by checks at intervals not exceeding 25 hours' time in service. Replace studs if relative motion is found and perform repetitive torque inspections every 100 hours' time in service. Follow MDHC SIN DN-151/EN-39/FN-28 procedures.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to further flight after the effective date of this AD, and within the next 25 hours' time in service after the effective date for subsequent checks.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) (HUGHES HELICOPTERS, INC.) Model 369D, E, F, and FF helicopters with tail rotor transmission/tail boom extension mounting studs Part Number MS51992A803-13 or -14 installed.
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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