AD 2009-25-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | S-92A | Airworthiness Directives; Sikorsky Aircraft Corporation (Sikorsky) Model S-92A Helicopters |
Unsafe Condition
Failure of the oil filter bowl or mounting studs can result in sudden and complete loss of oil from the main gearbox (MGB), leading to MGB failure 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
Visually inspect the MGB lube system filter assembly for oil filter damage. If either the primary or secondary oil filter is damaged, replace both filters, all packings, and the studs before further flight. Replace the oil filter bowl within 30 days after replacing a damaged filter. Conduct a daily leak inspection for oil leaks during the 30-day interim period.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 7 days for the initial inspection, before further flight for filter and packing replacement, and within 30 days for oil filter bowl replacement.
AI-generated summary from the source AD text. Verify against the official source before acting.
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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