AD 99-19-30
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-76A | Airworthiness Directives; Sikorsky Aircraft Corp. Model S76A, B, and C Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-76B | Airworthiness Directives; Sikorsky Aircraft Corp. Model S76A, B, and C Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-76C | Airworthiness Directives; Sikorsky Aircraft Corp. Model S76A, B, and C Helicopters |
Unsafe Condition
Disbonding of the attachment angle between the tail gearbox forward fairing and the pylon leading to fairing separation, tail rotor blade damage, and subsequent loss of control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct a visual inspection of the attachment angle on each fairing within 50 hours time-in-service. Thereafter, inspect every 1500 hours TIS. If disbond area equals or exceeds 1.0 square inch, repair or replace the attachment angle prior to further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours time-in-service
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Aircraft Corporation Model S-76A, B, and C 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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