TURBOMECA Arrius 2B1, 2B1A, 2B2, and 2K1 turboshaft engines [Docket No. FAA-2013-0381; Directorate Identifier 2013-NE-16-AD; Amendment 39-17764; AD 2014-04-06] – requires initial and repetitive inspections of the hydro-mechanical metering unit (HMU) high pressure pump drive gear shaft splines...

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