TURBOMECA Arriel 2D turboshaft engines [Docket No. FAA-2012-0940; Directorate Identifier 2012-NE-26-AD; Amendment 39-17321; AD 2013-01-07] – requires replacing the hydromechanical metering unit (HMU) at a reduced life. This AD was prompted by a low fuel pressure event caused by deterioration and a...

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