AD 2009-14-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Turbomeca S.A. Arrius 2F Turboshaft Engines |
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Arrius 2F Turboshaft Engines |
Unsafe Condition
Failure of the O-ring on the check valve piston in the lubrication unit could lead to an uncommanded in-flight shutdown of the engine, which could result in a forced autorotation landing and damage to the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the O-ring on the check valve piston in the lubrication unit at the intervals specified in Table 1 of the AD. Within 150 flight hours after the effective date of this AD, incorporate Turbomeca Modification Tf75 by replacing the check valve piston with a design not requiring an O-ring.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 150 flight hours after the effective date of this AD.
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Affected Aircraft
Turbomeca S.A. Arrius 2F turboshaft engines that have not incorporated Modification Tf75, installed on, but not limited to, Eurocopter EC120B 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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