AD 95-26-01 Airworthiness Directives; AlliedSignal, Inc. (formerly Textron Lycoming) Models LTS101-650B1, -750B1, -650C, and -750C Turboshaft Engines

Makes named: lycoming. Models named: LTS101-650B1, -750B1, -650C, -750C turboshaft. Read the applicability below — it usually turns on serial or part numbers too.

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 [[Page 6768]] 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.

Required as indicated, unless accomplished previously. To prevent power turbine (PT) overspeed and uncontained engine failure, accomplish the following: (a) Install the improved PT rotor with retention capability at the next shop visit when the PT rotor is removed after the effective date of this AD, but prior to December 31, 1997, in accordance with the following Textron Lycoming Service Bulletins (SB): ---------------------------------------------------------------------------------------------------------------- Engine model SB No. Rev. Date ---------------------------------------------------------------------------------------------------------------- LTS101-650B1................... LTS101B-72-50-0122 4 June 17, 1991. LTS101-750B1 or -650B1......... LTS101B-72-50-0116 6 August 14, 1992. LTS101-650C and -750C Series... LTS101C-72-50-0119 2 June 17, 1991. ---------------------------------------------------------------------------------------------------------------- (b) Install the improved electronic PT rotor overspeed controller concurrently with the PT rotor installation required by paragraph (a) of this AD, or at the next airframe 600 hour inspection point after the effective date of this AD, whichever occurs later, in accordance with the following Textron Lycoming SB: ---------------------------------------------------------------------------------------------------------------- Engine model SB No. Rev. Date ---------------------------------------------------------------------------------------------------------------- LTS101-650B1................... LTS101B-73-10-0127 2 August 14, 1992. LTS101-750B1................... LTS101B-73-10-0127 2 August 14, 1992. LTS101-650C and -750C Series... LTS101C-73-10-0129 3 August 14, 1992. ---------------------------------------------------------------------------------------------------------------- (c) Installation of the improved PT rotor with retention capability and the improved electronic PT rotor overspeed controller in accordance with paragraphs (a) and (b) of this AD constitutes terminating action to the inspection requirements of AD 88-14-01. (d) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Engine Certification Office. The request should be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Engine Certification Office. Note: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Engine Certification Office. (e) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the aircraft to a location where the requirements of this AD can be accomplished. (f) The actions required by this AD shall be done in accordance with the following service bulletins: ---------------------------------------------------------------------------------------------------------------- Document No. Pages Revision Date ---------------------------------------------------------------------------------------------------------------- LTS101B-72-50-0122......................... 1-11 4 June 17, 1991. Total pages:......................... 11 LTS101B-72-50-0116......................... 1-10 6 August 14, 1992. Total pages:......................... 10 LTS101C-72-50-0119......................... 1-11 2 June 17, 1991. Total pages:......................... 11 LTS101B-73-10-0127......................... 1-13 2 August 14, 1992. Total pages:......................... 13 LTS101C-73-10-0129......................... 1-14 3 August 14, 1992. Total pages:......................... 14 ---------------------------------------------------------------------------------------------------------------- This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from AlliedSignal Inc., 550 Main Street, Stratford, CT 06497. Copies may be inspected at the FAA, New England Region, Office of the Assistant Chief Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street NW., suite 700, Washington, DC. (g) This amendment becomes effective on April 22, 1996. Issued in Burlington, Massachusetts, on January 24, 1996. Jay J. Pardee, Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 96-2589 Filed 2-21-96; 8:45 am] BILLING CODE 4910-13-P