MANUFACTURER: Turbomeca SUBJECT: Airworthiness Directive 2005-17-17 SUMMARY: The FAA is
adopting a new airworthiness directive (AD) for Turbomeca S.A.
Arrius 2F turboshaft engines. This AD requires replacing certain
O-rings on the check valve piston in the lubrication unit. This AD
results from a report of a forced landing of a Eurocopter EC120B
helicopter. We are issuing this AD to prevent an uncommanded
in-flight shutdown of the engine, which could result in a forced
autorotation landing and damage to the helicopter.