AD 89-07-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-76A | Airworthiness Directives; SIKORSKY AIRCRAFT Model S-76 Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-76B | Airworthiness Directives; SIKORSKY AIRCRAFT Model S-76 Series Helicopters |
Unsafe Condition
Fatigue failure of the tail rotor component could result in a reduction of directional control and hazardous tail rotor vibration in the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the tail rotor horn, P/N 76101-05006, with a serviceable one before it accumulates 12,000 hours' time in service. Initial replacement must occur within 100 hours' time in service after the AD's effective date or before 12,000 hours' time in service, whichever is later. Use tail rotor blade bonded assembly hours if component records are unavailable.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 100 hours' time in service after the effective date of this AD or before the accumulation of 12,000 hours' time in service, whichever occurs later
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Aircraft Corporation Model S-76A and S-76B helicopters equipped with tail rotor horn P/N 76101-05006.
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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