AD 2009-21-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Turbomeca S.A. ARRIUS 1A Turboshaft Engines |
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. ARRIUS 1A Turboshaft Engines |
Unsafe Condition
Cycle life limit value for ARRIUS 1A balancing piston Part Number (P/N) 0 319 20 152 0, initially set at 40,000 cycles, has been reduced to 16,000 cycles due to a calculation error. Failure of the balancing piston could result in an engine in-flight-shutdown and the release of high-energy debris, potentially causing damage to the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove ARRIUS 1A engines with balancing piston P/N 0 319 20 152 0 from service before the piston accumulates 16,000 cycles-since-new (CSN). Prohibit returning to service any engine with a balancing piston that has accumulated 16,000 or more CSN.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before the balancing piston accumulates 16,000 CSN.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Turbomeca S.A. ARRIUS 1A turboshaft engines with balancing pistons, part number (P/N) 0 319 20 152 0, installed. These engines are installed on, but not limited to, Eurocopter AS355N helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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