AD 2009-13-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft Corporation Model S-92A | Airworthiness Directives; Sikorsky Aircraft Corporation Model S-92A Helicopters |
Unsafe Condition
Failure of titanium studs attaching the main gearbox (MGB) filter bowl assembly, leading to rapid loss of MGB oil, failure of the MGB, and subsequent loss of control of the helicopter.
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Required Actions
Remove all titanium studs attaching the MGB filter bowl assembly and replace them with steel studs. Revise the Rotorcraft Flight Manual (RFM) to clarify and emphasize certain Normal and Emergency procedures addressing specified MGB malfunctions.
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Compliance Time
Before further flight for titanium stud replacement; within 10 hours time-in-service for RFM revisions.
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Affected Aircraft
Sikorsky Aircraft Corporation Model S-92A helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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