AD 91-24-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca S.A. | Arriel 1B | TURBOMECA Model Arriel 1B, 1D, Arriel 1D, and Arriel 1D1 Engines |
| engine | Turbomeca S.A. | Arriel 1D | TURBOMECA Model Arriel 1B, 1D, Arriel 1D, and Arriel 1D1 Engines |
| engine | Turbomeca S.A. | Arriel 1D1 | TURBOMECA Model Arriel 1B, 1D, Arriel 1D, and Arriel 1D1 Engines |
Unsafe Condition
Free wheel clutch failure and inability to transmit power from the engine to the main rotor drive shaft.
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Required Actions
Install a free wheel clutch per Turbomeca Service Document 72.292.0141 (TU 212) and a free wheel shaft per Service Bulletin 292.72.0146 (TU 221). Engines with free wheel assemblies S/N below 793 without prior maintenance are exempt.
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Compliance Time
Within 20 days from the effective date (February 21, 1992) or at next shop visit by March 31, 1992, whichever comes first.
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Affected Aircraft
Turbomeca Arriel 1B, 1D, Arriel 1D, and Arriel 1D1 engines installed on Aerospatiale AS350 Ecureuil aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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