AD Amdt-39-10989
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | McDonnell Douglas | Helicopter Systems Model MD-900 | Airworthiness Directives; McDonnell Douglas Helicopter Systems Model MD-900 Helicopters |
Unsafe Condition
Cracks in the main rotor upper hub assembly could result in failure of the hub assembly, loss of drive to the main rotor, and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the main rotor upper hub assembly for cracks. If a crack is found, replace the hub assembly. Verify attachment nut torque values. Implement a repetitive inspection at intervals not exceeding 150 hours time-in-service.
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Compliance Time
Before further flight
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Affected Aircraft
McDonnell Douglas Helicopter Systems Model MD-900 helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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