AD 2011-12-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | S-92A | Airworthiness Directives; Sikorsky Aircraft Corporation (Sikorsky) Model S-92A Helicopters |
Unsafe Condition
Crack found on the MGB upper housing assembly left mounting foot forward rib that cannot be detected visually, potentially leading to loss of the MGB 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
Eddy current or fluorescent penetrant inspection (FPI) of each MGB upper housing assembly rib on the left, right, and forward MGB mounting foot at specified intervals based on MGB upper housing assembly hours time-in-service (TIS). If a crack is found, replace the MGB upper housing assembly with an airworthy one.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within specified intervals based on MGB upper housing assembly hours TIS.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Aircraft Corporation Model S-92A helicopters with main gearbox (MGB) upper housing assembly.
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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