Airworthiness Directive · Amendment 39-9547 · AlliedSignal, Inc. LTS101 Series Turboshaft Engines Installed on Eurocopter France Model AS-350D and SA- 366G1 Helicopters
AlliedSignal, Inc. LTS101 Series Turboshaft Engines Installed on Eurocopter France Model AS-350D and SA- 366G1 Helicopters
AlliedSignal, Inc. (formerly Textron Lycoming) Models LTS101-600A-2 and -600A-3 turboshaft engines installed on Eurocopter France (formerly Aerospatiale) Model AS-350D helicopters; and LTS101-750B-2 turboshaft engines installed on Eurocopter France Model SA-366G1 helicopters. Note: This airworthiness directive (AD) applies to each engine identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must use the authority provided in paragraph (c) to request approval from the Federal Aviation Administration (FAA). This approval may address either no action, if the current configuration eliminates the unsafe condition, or different actions necessary to address the unsafe condition described in this AD. Such a request should include an assessment of the effect of the changed configuration on the unsafe condition addressed by this AD. In no case does the presence of any modification, alteration, or repair remove any engine from the applicability of this AD.
This amendment adopts a new airworthiness directive (AD), applicable to AlliedSignal, Inc. (formerly Textron Lycoming) LTS101 series turboshaft engines installed on Eurocopter France (formerly Aerospatiale) Model AS-350D and SA-366G1 helicopters, that requires incorporation of design modifications to the power turbine (PT) rotor. This amendment is prompted by reports of PT disk failures after No. 3 bearing failures. The actions specified by this AD are intended to prevent an uncontained engine failure due to a PT disk failure.
