AD 2005-11-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Arrius 1A Turboshaft Engines |
Unsafe Condition
A malfunction of the Free Turbine Overspeed Protection System can exist despite the DECU passing all functional tests specified in the Engine Maintenance Manual.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Initial testing of the DECU Free Turbine Overspeed Protection System must be conducted within 25 flight hours after the effective date. If the system fails the test, the DECU must be replaced before further flight. Repetitive testing must be conducted at each functional test of the DECU Free Turbine Overspeed Protection System.
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Compliance Time
Within 25 flight hours after the effective date of the AD.
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Affected Aircraft
Turbomeca S.A. Arrius 1A turboshaft engines, installed on, but not limited to, Eurocopter AS355N Twinstar helicopters.
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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