AD 2001-07-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD | Various | Airworthiness Directives; MD Helicopters Inc. Model MD-900 Helicopters |
Unsafe Condition
Failure of the hub assembly, loss of drive to the main rotor, and subsequent loss of control of the helicopter due to cracked main rotor upper hub assembly drive plate attachment flange.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 6 hours time-in-service (TIS), visually inspect the main rotor upper hub assembly drive plate attachment flange for cracks and determine the torque of each flange nut. If a crack is found, replace the hub assembly before further flight. Within 25 hours TIS, inspect the hub assembly and verify the nut torque. Replace a cracked hub assembly with an airworthy one before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 6 hours TIS for initial inspection and crack determination; within 25 hours TIS for subsequent inspection and nut torque verification.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
MD Helicopters Inc. Model MD-900 helicopters with main rotor upper hub assembly, part number 900R2101006-105 or 900R2101006-107, installed.
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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