AD 2005-17-17
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Arrius 2F Turboshaft Engines |
Unsafe Condition
Excessive swelling of the O-ring on the check valve piston in the lubrication unit, caused by the class of oil used (STD or HTS) and engine operating time, can interrupt engine lubrication, leading to an uncommanded in-flight shutdown.
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Required Actions
Replace the O-ring on the check valve piston in the lubrication unit at specified intervals based on oil class and engine operating time. Use Turbomeca Alert Service Bulletin No. A319 79 4802 for replacement procedures.
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Compliance Time
Within 300 hours TSN or 50 hours after the effective date for HTS or unknown oil; within 450 hours TSN or 50 hours after the effective date for STD oil. Thereafter, replace the O-ring within 300 hours TSR for HTS oil or 500 hours TSR for STD oil.
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Affected Aircraft
Turbomeca S.A. Arrius 2F turboshaft engines installed on, but not limited to, Eurocopter EC120B helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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