AD Amdt-39-16245
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 Power Turbine (PT) wheels may lead to reduced fatigue resistance, potentially resulting in blade release and an uncommanded in-flight shutdown.
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Required Actions
Remove PT blades from service before further flight if the affected Module M04 has accumulated 5,000 total PT cycles or more. For modules with fewer than 5,000 cycles, remove PT blades before reaching 5,000 cycles. Do not reinstall removed PT blades into any engine.
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Compliance Time
Before further flight for engines with 5,000 or more PT cycles; before accumulating 5,000 PT cycles for engines with fewer cycles.
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Affected Aircraft
Turbomeca Arriel 1B, 1D, 1D1, 2B, and 2B1 turboshaft engines with Module M04 installed, as listed by serial number in Turbomeca Alert Mandatory Service Bulletins A292 72 0827 and A292 72 2833. These engines are installed on, but not limited to, Eurocopter AS 350 B, AS 350 BA, AS 350 B1, AS 350 B2, 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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