AD Amdt-39-12216
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft Corporation Model S-76A | Airworthiness Directives; Sikorsky Aircraft Corporation Model S-76A Helicopters |
Unsafe Condition
Disbonding of the polyurethane filler that fills the space between the aluminum centering plug and the graphite spar, leading to the centering plug moving out of position, loss of tail rotor control, and subsequent 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 centering plug for disbonding of the polyurethane filler. If disbonding is found, install a retaining pad or repair/replace the blade assembly as specified in the Accomplishment Instructions of Sikorsky Aircraft Corporation Alert Service Bulletin No. 76-65-35B (153B), Revision B, dated October 2, 1997.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 25 hours time-in-service, unless accomplished previously.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Aircraft Corporation Model S-76A helicopters with tail rotor blade assembly, part number 76101-05001 (all dash numbers) or 76101-05101 (all dash numbers), installed with more than 130 hours time-in-service, 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 6, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.