AD 80-21-52
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters | SA-360C Dauphin | Airworthiness Directives; SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE Model SA-360C Series Helicopter |
Unsafe Condition
Loss of main rotor speed due to failure in the engine to main transmission connection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect two half housings and gimbal ring attachment flange for cracks and defects. Remove upper housing half to inspect flexible couplings for cracks, breaks, distortion, and corrosion. Check flector positioning and dry torque nut to 4-5 mdaN (30-35 ft lbs). Inspect main transmission input coupling flange for damage. If cracks found, perform dye penetrant inspection on main transmission flange. Replace cracked parts before flight. Repair other defects as needed.
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Compliance Time
within 10 hours time in service after the effective date of this AD
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Affected Aircraft
SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE Model SA-360C series helicopter, 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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