AD 2006-02-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | Arriel 1B | Airworthiness Directives; Turbomeca Arriel 1B, 1D, 1D1, and 1S1 Turboshaft Engines |
Unsafe Condition
Reports of the release of gas generator 2nd stage turbine blades while in service, with full containment of debris.
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Required Actions
Perform initial and repetitive position checks of the gas generator 2nd stage turbine blades on all Turbomeca Arriel 1B, 1D, 1D1, and 1S1 turboshaft engines. Perform initial and repetitive replacements of 2nd stage turbines on 1B, 1D, and 1D1 engines only.
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Compliance Time
Within 1,500 hours TSN or TSO for Arriel 1D and 1D1 engines, and 2,200 hours TSN or TSO for Arriel 1B engines, initially replace the 2nd stage turbine with a new or overhauled 2nd stage turbine as soon as practicable, but no later than August 31, 2006.
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Affected Aircraft
Turbomeca Arriel 1B engines fitted with 2nd stage turbine modification TU 148, and Arriel 1D, 1D1, and 1S1 engines. Arriel 1B engines are installed on, but not limited to, Eurocopter France AS-350B and AS-350A 'Ecureuil' helicopters; 1D engines are installed on, but not limited to, Eurocopter France AS-350B1 'Ecureuil' helicopters; 1D1 engines are installed on, but not limited to, Eurocopter France AS-350B2 'Ecureuil' helicopters; and Arriel 1S1 engines are installed on, but not limited to, Sikorsky Aircraft S-76A and S-76C helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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