AD 2005-22-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft Corporation Model S-76A | Airworthiness Directives; Sikorsky Aircraft Corporation Model S-76A, B, and C Helicopters |
Unsafe Condition
Failure of a bifilar lug due to cracks in the lug attachment area, leading to damage to the main rotor system 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
Inspect the bifilar arm assembly for cracks in the lug attachment area. If a crack is found, replace the bifilar arm assembly with an airworthy one before further flight. If no crack is found, perform a one-time torque test on the lug nuts and apply required torque if necessary.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours time-in-service (TIS), unless previously accomplished.
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Affected Aircraft
Sikorsky Aircraft Corporation Model S-76A, B, and C helicopters with pilot fitting part number 76103-08003-101 and 1500 or more hours time-in-service.
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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