AD 2013-22-22
Effective 12/20/2013 · Published 11/15/2013
Airworthiness Directives; Turbomeca S.A. Turboshaft Engines
Summary
We are superseding airworthiness directive (AD) 2013-01-07 for all Turbomeca S.A. Arriel 2D turboshaft engines. AD 2013-01-07 required replacing the hydromechanical metering unit (HMU) at a reduced life. This AD maintains that requirement and also requires conducting inspections of the HMU. This AD was prompted by further cases of deterioration of HMU rotating components. We are issuing this AD to prevent an uncomma…