AD 2010-10-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | Arriel 1B | Airworthiness Directives; Turbomeca Arriel 1B, 1D, 1D1, and 1S1 Turboshaft Engines |
Unsafe Condition
Reports of new cases of failures of 2nd stage turbine blades could result in an uncommanded in-flight engine shutdown, and a subsequent forced autorotation landing or accident.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform an initial relative position check of the 2nd stage turbine blades using specified Turbomeca Mandatory Service Bulletins (MSBs) before reaching specified intervals or within 50 hours time-in-service after the effective date of this AD, whichever occurs later. Recheck the relative position of 2nd stage turbine blades at the specified repetitive intervals using the indicated Turbomeca MSBs.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours time-in-service after the effective date of this AD or before reaching specified intervals, whichever occurs later.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Turbomeca Arriel 1B (incorporating mod TU 148), 1D, 1D1, and 1S1 turboshaft engines that do not incorporate mod TU 347. Arriel 1B engines are installed on, but not limited to, Eurocopter AS-350B and AS-350BA 'Ecureuil' helicopters. Arriel 1D engines are installed on, but not limited to, Eurocopter France AS-350B1 'Ecureuil' helicopters. Arriel 1D1 engines are installed on, but not limited to, Eurocopter France AS-350B2 'Ecureuil' helicopters. Arriel 1S1 engines are installed on, but not limited to, Sikorsky Aircraft Corporation S-76C helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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