AD 2000-23-52
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft Corporation Model S-76A | Airworthiness Directives; Sikorsky Aircraft Corporation Model S-76A, S-76B, and S-76C Helicopters |
Unsafe Condition
Failure of the main rotor shaft assembly (shaft) due to cracks, which could lead to loss of control of the helicopter.
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Required Actions
Perform a fluorescent penetrant inspection of the main rotor shaft assembly before further flight. Conduct recurring fluorescent penetrant inspections and daily visual inspections for cracks. Replace the shaft with an airworthy one if any crack is found.
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Compliance Time
Before further flight
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Affected Aircraft
Sikorsky Aircraft Corporation Model S-76A, S-76B, and S-76C helicopters with main rotor shaft assembly (shaft), part number 76351-09030 series or 76351-09630 series, installed.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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