AD 89-20-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD Helicopters, Inc. | 369D | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369D and E Helicopters |
| aircraft | MD Helicopters, Inc. | 369E | Airworthiness Directives; MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369D and E Helicopters |
Unsafe Condition
Fatigue failure of four-bladed tail rotor hubs (P/N 369D21700-3) could result in loss of control of the helicopter due to electrical arc burns and cracks.
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Required Actions
Inspect tail rotor hubs (P/N 369D21700-3) with serial numbers 196-251 within 10 hours' time in service for electrical arc burns and cracks. Inspect hubs with serial numbers 1-195 within 100 hours' time in service for the same issues. Replace hubs with serviceable units if defects are found. Inspect spares inventory hubs 1-251 prior to installation; reject if defects exist. Log inspection results and report findings to FAA within 10 days.
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Compliance Time
Within 10 hours' time in service after the effective date of this AD (for serial numbers 196-251) and within 100 hours' time in service after the effective date (for serial numbers 1-195).
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Affected Aircraft
MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369D and E helicopters with hubs of four-bladed tail rotors, Part Number 369D21700-3 installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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