AD 2009-08-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Turbomeca Arriel 1B, 1D, 1D1, 2B, and 2B1 Turboshaft Engines |
| engine | Turbomeca | Arriel 1B | Airworthiness Directives; Turbomeca Arriel 1B, 1D, 1D1, 2B, and 2B1 Turboshaft Engines |
Unsafe Condition
Geometric non-conformances on blade fir tree roots of Arriel 1 and Arriel 2 power turbine (PT) wheels may lead to reduced fatigue resistance, potentially resulting in blade release and uncommanded in-flight shutdown.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove affected PT blades from service. Inspect power turbine modules M04 listed in Alert MSBs A292 72 0827 for Arriel 1 engines and A292 72 2833 for Arriel 2 engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Turbomeca Arriel 1B, 1D, 1D1, 2B, and 2B1 turboshaft engines with power turbine modules M04 listed in Alert MSBs A292 72 0827 and A292 72 2833.
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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