AD 91-08-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-76A | Airworthiness Directives; Sikorsky Aircraft Model S-76A Helicopters |
Unsafe Condition
Fatigue failure of the vertical pylon forward spar, which could result in loss of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Determine if forward spar cap angles (part numbers 76201-05001-103 and 76201-05001-104) are installed and if equipped with Sikorsky Modification Kit 76070-20086. If the helicopter has the original unmodified forward spar cap angles with 1,395 or more hours time in service after the AD's effective date, replace the angles with new parts of the same part numbers. For helicopters with less than 1,395 hours time in service, replace the angles prior to accumulating 1,420 hours time in service and thereafter at intervals not exceeding 1,420 hours.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 25 hours time in service. Thereafter at intervals not to exceed 1,420 hours time in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Aircraft Model S-76A helicopters, certificated in any category.
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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