AD 2001-03-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft Corporation Model S-76B and S-76C | Airworthiness Directives; Sikorsky Aircraft Corporation Model S-76B and S-76C Helicopters |
Unsafe Condition
Failure of the main rotor shaft due to cracks, which could lead to loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct initial and recurring fluorescent penetrant inspections (FPI) in the specified area of the main rotor shaft. Replace each affected main rotor shaft with an airworthy one before reaching 1,000 hours time-in-service (TIS).
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight for initial FPI, and thereafter at intervals not exceeding 20 hours TIS or 80 landings, whichever occurs first. Replace each affected shaft on or before 1,000 hours TIS.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Aircraft Corporation Model S-76B and S-76C helicopters with main rotor shaft assembly (part number 76351-09630, all dash numbers), and specific serial numbers listed in the AD.
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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