AD 2014-07-06
Effective 05/15/2014 · Published 04/10/2014
Airworthiness Directives; Turbomeca S.A. Turboshaft Engines
Summary
We are superseding airworthiness directive (AD) 2007-19-09R1 for all Turbomeca S.A. Arriel 2B1 turboshaft engines that do not have modification TU157 incorporated. AD 2007-19-09R1 required replacement of the hydromechanical metering unit (HMU) with a serviceable HMU. This AD requires HMU replacement; reduction of the compliance interval; and inclusion of the power turbine C2 cycle consumption rate when determining c…