AD 88-05-01 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-76B | Airworthiness Directives; SIKORSKY AIRCRAFT Model S-76B Helicopters |
Unsafe Condition
Failure of the helicopter forward engine support cross beam due to cracks in the cap angle and web, specifically Part Numbers 76070-20526-102 and 76070-20526-139, -149, or -158.
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Required Actions
Visually inspect the forward engine support cross beam cap angle and web for cracks using a flashlight and mirror. If cracks are found, verify with dye penetrant inspection. Replace cracked cap angle parts prior to further flight. Repair or replace cracked web parts with approved methods. Report findings within 10 days. Allow ferry flights under FAR 21.197/199.
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Compliance Time
Within the next 50 hours' time in service after July 16, 1990, and thereafter every 50 hours' time in service.
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Affected Aircraft
Sikorsky Model S-76B helicopters with serial numbers 760312, 760314, 760316, 760317, 760318, 760319, 760327, 760330, 760331, and 760337, equipped with original cross beam cap angle P/N 76070-20526-102 and web P/N 76070-20526-139, -149, or -158.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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