AD 2002-22-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD | Various | Airworthiness Directives; MD Helicopters, Inc. Model MD900 Helicopters |
Unsafe Condition
Cracking or pitting in the main rotor support static mast (mast) that could result in failure of the mast, separation of 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
Remove the main rotor drive shaft, inspect the top 1 inch of the inside diameter of the mast for cracks or pitting, and remove the mast from service if any are found. Remove the main rotor hub assembly and inspect the mast threads for cracks. If a flaw is found in the thread root area and cannot be determined as a crack, perform a magnetic particle inspection (wet fluorescent) for cracks.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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Affected Aircraft
MD Helicopters, Inc. Model MD900 helicopters, serial numbers 900-00008 through 900-00110, with a main rotor support static mast (mast), part number 900F2401021-101, 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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