AD Amdt-39-16445
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Turboméca S.A. Arriel 2B and 2B1 Turboshaft Engines |
Unsafe Condition
Axial displacement of the HP blade relative to the disk in case of blade lock rupture or opening, which could lead to an uncommanded in-flight engine shutdown.
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Required Actions
Perform an initial HP turbine borescope inspection according to Turboméca S.A. MSB No. 292 72 2825. Replace HP turbine modules with rearward turbine blade displacement greater than 0.5 mm. Perform 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.
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Affected Aircraft
Turboméca S.A. Arriel 2B and 2B1 turboshaft engines that do not incorporate modification TU166, 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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