Airworthiness Directive · Amendment 39-18440 · Turbomeca S.A. Turboshaft Engines
Turbomeca S.A. Turboshaft Engines
This AD applies to all Turbomeca S.A. Makila 2A and 2A1 turboshaft engines that have incorporated Turbomeca S.A. Service Bulletin No. 298 79 2831, Version B, dated November 13, 2015, or earlier.
We are adopting a new airworthiness directive (AD) for certain Turbomeca S.A. Makila 2A and 2A1 turboshaft engines. This AD requires tightening the nut attaching the swivel union to the engine power turbine module M04. This AD was prompted by two occurrences of commanded in-flight shutdown following low oil pressure warning. We are issuing this AD to prevent loosening of the nut and oil leakage from the low-pressure oil system, which could lead to in-flight shutdown of the engine and forced landing.
(1) Within 30 engine hours or 7 days after the effective date of this AD, whichever occurs first, apply 15 Newton-meters torque to the nut, part number 9560130990, attaching the swivel union to the engine power turbine module M04. Use a backup wrench to prevent the swivel union from rotating.
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.
