Airworthiness Directive · Amendment 39-18408 · Turbomeca S.A. Turboshaft Engines
Turbomeca S.A. Turboshaft Engines
(1) This AD applies to Turbomeca S.A. Arriel 1E2 turboshaft engines with tachometer boxes with the following part number (P/N) and serial number (S/N) combinations:
(i) P/N 9580116170—all S/Ns
(ii) P/N 9580116260—all S/Ns
(iii) P/N 9580116900—all S/Ns
(iv) P/N 9580117110—all S/Ns
(v) P/N 9580117550—all S/Ns 1499 and below with or without suffix letters and all S/Ns 1500 and above that do not contain the suffix letters EL.
(2) This AD applies only to Turbomeca S.A. Arriel 1E2 turboshaft engines with tachometer boxes identified in paragraph (c)(1) of this AD that also have installed electrical connectors labeled as P10106, P10098, and P10108; or P11F, P13F, and P15F.
We are adopting a new airworthiness directive (AD) for certain Turbomeca S.A. Arriel 1E2 turboshaft engines. This AD requires removing the tachometer box on affected engines. This AD was prompted by reports of uncommanded in-flight shutdowns (IFSDs). We are issuing this AD to prevent failure of the tachometer box, which could lead to failure of the engine, IFSD, and loss of control of the helicopter.
(1) Within 1,600 flight hours after the effective date of this AD, remove the affected tachometer box from the engine.
(2) Reserved.
You may take credit for the action required by paragraph (e) of this AD if you performed the action before the effective date of this AD in accordance with Turbomeca S.A. Mandatory Service Bulletin 292 77 0844, Version A, dated March 4, 2015.
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.
