Superseded. This AD was superseded by AD 2018-12-01. Verify which one applies to your serial and effectivity before any maintenance action.
AD 2012-03-11
Effective 03/20/2012 · Published 02/14/2012
Airworthiness Directives; Turbomeca S.A. Turboshaft Engines
Summary
We are superseding an existing airworthiness directive (AD) for all Turbomeca S.A. Arriel 2B and 2B1 turboshaft engines. That AD currently requires checking the transmissible torque between the low- pressure (LP) pump impeller and the high-pressure (HP) pump shaft on high-pressure/low-pressure (HP/LP) pump hydro-mechanical metering units (HMUs) that do not incorporate Modification TU 147. This new AD requires inspec…