AD 2007-01-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft Corporation Model S-61L | Airworthiness Directives; Sikorsky Aircraft Corporation Model S-61L, N, R, and NM Helicopters |
Unsafe Condition
Slipping or disengagement of the main gearbox input left and right freewheel unit (IFWU) assembly, leading to engine overspeed, shutdowns, and loss of engine power to the transmissions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Create a component history card or equivalent record for each IFWU assembly. Record TIS and lift cycles for each IFWU assembly. Calculate a moving average of lift cycles per hour TIS at specified intervals. Visually and dimensionally inspect IFWU assemblies used in repetitive external lift (REL) operations at specified intervals. Replace parts beyond wear limits or exhibiting visual surface distress with airworthy parts. Permanently mark REL IFWU camshafts and gear housings with the letters 'REL'.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within a specified time (not detailed in the source).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Aircraft Corporation Model S-61L, N, R, and NM helicopters.
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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