AD 79-12-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-61A | Airworthiness Directives; SIKORSKY S-61 series helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61D | Airworthiness Directives; SIKORSKY S-61 series helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61E | Airworthiness Directives; SIKORSKY S-61 series helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61L | Airworthiness Directives; SIKORSKY S-61 series helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61N | Airworthiness Directives; SIKORSKY S-61 series helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61NM | Airworthiness Directives; SIKORSKY S-61 series helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61R | Airworthiness Directives; SIKORSKY S-61 series helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61V | Airworthiness Directives; SIKORSKY S-61 series helicopters |
Unsafe Condition
Failure of the tail rotor blade due to cracks in the spar and skin or tail rotor gearbox mounting feet.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect tail rotor blades (P/Ns S6115-30001 or S6117-30001 series) for cracks via dye penetrant and ultrasonic methods, and visually inspect daily. Replace cracked blades or gearbox mounting feet with serviceable components. Report any cracks to the FAA as specified.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to further flight, within the next six hours time in service, and thereafter at intervals not to exceed six hours time in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky S-61A, S-61D, S-61E, S-61L, S-61N, S-61NM, S-61R, S-61V helicopters with P/Ns S6115-30001 or S6117-30001 series tail rotor blades.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.