Airworthiness Directive · Amendment 39-17321 · Turbomeca S.A. Turboshaft Engines
Turbomeca S.A. Turboshaft Engines
Superseded. A later AD replaced this one: AD 2013-22-22. Comply with the one in force.
This AD applies to all Turbomeca S.A. Arriel 2D turboshaft engines.
We are adopting a new airworthiness directive (AD) for Turbomeca S.A. Arriel 2D turboshaft engines. This AD was prompted by a low fuel pressure event caused by deterioration and a loss of the low- pressure drive function within the hydro-mechanical metering unit (HMU). This AD requires replacing the HMU at a reduced life. We are issuing this AD to prevent an uncommanded in-flight shutdown of the engine, and possible loss of the helicopter.
Unless already done, replace the HMU with an HMU eligible for installation:
(1) Before the HMU exceeds 800 operating hours since new; or
(2) Within 800 operating hours since last replacement of the low-pressure pump spindle wheel assembly, high-pressure pump complete sleeve, bearings/pinions (matched assembly), and sleeve assembly.
After the effective date of this AD, do not install any HMU onto any engine, or install any engine onto any helicopter, unless in compliance with the requirements of paragraph (e) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
