AD 50-08-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-51 | Airworthiness Directives; Sikorsky Model S-51 Helicopters |
Unsafe Condition
Cracks in the upper longerons of the S-10-20-3003 tail cone mounting assembly adjacent to the generator support plate, clamps, and welds.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the upper longerons (Drawing S-520879) for cracks near the generator support plate, clamps, and welds. Reinforce or replace cracked members before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
at each 25-hour inspection
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Affected Aircraft
Sikorsky Model S-51 Helicopters, all serial numbers
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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