AD 84-10-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-76A | Airworthiness Directives; SIKORSKY AIRCRAFT Model S-76A Series Helicopters |
Unsafe Condition
Cracked main rotor spar due to operation with more than 600 hours time in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the main rotor blade spar for cracks in accordance with the Sikorsky S-76 Composite Materials Manual, SA-4047-76-5, paragraph 2-7 or 2-7A. Replace the main rotor blade with a new or serviceable component before further flight if a spar crack is found.
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Compliance Time
within the next 25 hours time in service after the effective date of this AD, unless previously accomplished and thereafter at intervals not to exceed 500 hours time in service
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Affected Aircraft
Sikorsky Aircraft Corporation Model S-76A series helicopters with main rotor blades, Part Number 76150-09000 or 76150-09100, with more than 600 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 8, 2026
Rights: U.S. Government Public Domain
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