The FAA is adopting a new AD for Turbomeca Arrius 2F turboshaft engines. The AD requires removing from service certain serial number FCUs or replacing the constant delta pressure diaphragm in those FCUs.
The AD results from a report of an accident in July 2005 involving a Eurocopter EC120B helicopter. The AD is issued to prevent an uncommanded engine in-flight shutdown on a single-engine helicopter, resulting in a forced autorotation landing or an accident.
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