AD 81-09-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-76A | Airworthiness Directives; SIKORSKY AIRCRAFT Model S-76A Series Helicopters |
Unsafe Condition
Cracked bolts in the main rotor blade tip plate attachment joint
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace NAS624H6 bolts with equivalent approved procedure, inspect for torque, and report discrepancies within 24 hours to the specified FAA office.
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Compliance Time
Within the next 25 hours time in service after May 7, 1981, for blades with 340+ hours, or before accumulating 365 hours time in service for blades with less than 340 hours as of May 7, 1981.
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Affected Aircraft
Sikorsky Aircraft Model S-76A series helicopters with P/N 76150-09000 series and P/N 76150-09100-041, -042, -043 main rotor blades.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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