Airworthiness Directive · Amendment 39-9459 · AlliedSignal, Inc. (formerly Textron Lycoming) Models LTS101-650B1, -750B1, -650C, and -750C Turboshaft Engines
AlliedSignal, Inc. (formerly Textron Lycoming) Models LTS101-650B1, -750B1, -650C, and -750C Turboshaft Engines
AlliedSignal, Inc. (formerly Textron Lycoming) Model LTS101-650B1, -750B1, -650C, and -750C turboshaft engines installed on Bell Helicopter Textron 222 series and Messerschmitt- Bolkow-Blohm (MBB) BK117 series helicopters. Note: This 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 (d) to request approval from the 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) Models LTS101-650B1, -750B1, -650C, and -750C turboshaft engines, that requires installation of an improved power turbine (PT) rotor and electronic PT rotor overspeed controller as a terminating action to the currently required inspections of AD 88-14-01. This amendment is prompted by reports of additional bearing failures since publication of AD 88-14-01, including one additional uncontained PT disk failure. The actions specified by this AD are intended to prevent PT overspeed and uncontained engine failure.
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.
Engines
