AD 2010-02-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Turbomeca S.A. Model Arriel 1B, 1D, and 1D1 Turboshaft Engines |
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Model Arriel 1B, 1D, and 1D1 Turboshaft Engines |
Unsafe Condition
The rupture of the Reduction Gear Box Intermediate Pinion may result in an overspeed of the Power Turbine and, subsequently, an uncommanded engine in-flight shutdown. This could lead to an emergency autorotation landing on a single-engine helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the Reduction Gear Box Intermediate Pinions (P/N 0 292 70 779 0) with Pinions incorporating Turbomeca modification TU 232 in accordance with Turbomeca Mandatory Service Bulletin 292 72 0276 Version B dated 06 November 2008.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
No later than 28 February 2011
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Affected Aircraft
Turbomeca S.A. Model Arriel 1B, 1D, and 1D1 Turboshaft Engines installed on, but not limited to, Eurocopter France AS350B, AS350BA, AS350B1, and AS350B2 helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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