AD 80-22-55 R4
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-76A | Airworthiness Directives; SIKORSKY AIRCRAFT Model S-76A Series Helicopters |
Unsafe Condition
Cracked or separated main rotor damper piston rods (P/N 76106-08000-042 and -043) could result in loss of main rotor control or structural failure of the damper assembly.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct dye penetrant inspections for cracks in the piston rods of specified dampers every 30 hours time in service. Inspect spherical bearings every 15 hours time in service and perform dye penetrant inspections if wear criteria are not met. Replace cracked piston rods before further flight.
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Compliance Time
Within 25 hours time in service after the effective date of this AD, and thereafter at intervals not to exceed 30 hours time in service for piston rod inspections; within 25 hours time in service after the effective date and thereafter at intervals not to exceed 15 hours time in service for bearing wear inspections.
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Affected Aircraft
Sikorsky Aircraft Corporation Model S-76A series helicopters with main rotor dampers P/N 76106-08000-042 and -043, certificated in all categories.
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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