AD 2015-04-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | S-76A | Airworthiness Directives; Sikorsky Aircraft Corporation (Sikorsky) Helicopters |
Unsafe Condition
Looseness or fracture of the tail rotor drive shaft (TDS) flange-to-shaft attachment hardware, which could lead to failure at the flange-to-shaft attachment and loss of tail rotor drive, potentially resulting in loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the TDS flange-to-shaft attachment hardware at four locations for correct installation and torque. If discrepancies are found, apply an index mark to the flange and shaft, inspect for cracks, fractures, wear, and measurements, and replace any part not meeting criteria. Reinstall the flange with proper alignment and torque the nuts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 30 days
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Affected Aircraft
Sikorsky Model S-76A, B, C, and D helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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