AD 2009-23-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft Corporation Model S-92A | Airworthiness Directives; Sikorsky Aircraft Corporation Model S-92A Helicopters |
Unsafe Condition
Reports of cracks in the main gearbox (MGB) mounting foot pads and foot ribs, which, if not detected, could result in 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
Clean and inspect each MGB assembly mounting foot pad and rib for cracks and corrosion. If no crack is found, apply a corrosion preventive compound. If a crack is found, replace the MGB before further flight. If corrosion, bubbled paint, or paint discoloration is found, repair the MGB before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 10 hours time-in-service (TIS), unless accomplished previously, and thereafter at intervals not to exceed 10 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) assembly, part number (P/N) 92351-15000-042 or -043, and MGB housing, P/N 92351-15110-042, -043, -044, or -045, installed.
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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