AD 2009-09-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Turbomeca S.A. Arriel 2B and 2B1 Turboshaft Engines |
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Arriel 2B and 2B1 Turboshaft Engines |
Unsafe Condition
Several cases of Gas Generator Turbine (HP Turbine) blade rearward displacement have been detected, resulting in blade rubs between the rear face of the fir-tree roots and the rear bearing support cover. High HP blade rearward displacement can potentially result in blade release due to fatigue, causing an uncommanded in-flight engine shutdown.
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Required Actions
Perform an initial HP turbine borescope inspection according to Turbomeca S.A. MSB No. 292 72 2825. Replace HP turbine modules with rearward turbine blade displacement greater than 0.5 mm. Conduct repetitive inspections within specified intervals based on blade displacement measurements.
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Compliance Time
Within 100 hours for engines not meeting initial inspection criteria, or as specified by inspection intervals based on blade displacement.
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Affected Aircraft
Turbomeca S.A. Arriel 2B and 2B1 turboshaft engines installed on, but not limited to, Eurocopter AS 350 B3 and EC 130 B4 helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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