AD 2011-14-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD | Various | Airworthiness Directives; MD Helicopters, Inc. Model MD900 Helicopters |
Unsafe Condition
Incorrectly inserted flanged bushings in the main rotor lower hub assembly (lower hub) can result in local corrosion, leading to fatigue cracking.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the lower hub for a crack. If a crack is found, replace the lower hub with an airworthy lower hub before further flight. Perform an eddy current inspection of the lower hub if necessary.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 100 hours time-in-service (TIS) or during the next annual inspection, whichever occurs first, unless the inspection was done within the last 200 hours TIS.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
MD Helicopters, Inc. Model MD900 helicopters with lower hubs having serial numbers beginning with 5009 (e.g., 5009-XXXX).
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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