96-12-05 AlliedSignal, Inc.: Amendment 39-9647. Docket 95-ANE-16.
Applicability: AlliedSignal, Inc. (formerly Textron Lycoming) LTS101 series turboshaft engines installed on, but not limited to, the Eurocopter AS350 and SA366G1, Messerschmitt-Bolkow-Blohm/Kawasaki MBB-BK117 and the Bell Helicopter Textron 222 aircraft, and LTP101 series turboprop engines, installed on but not limited to, the Piaggio P166DL and Airtractor AT302 aircraft. 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.
Compliance: Required as indicated, unless accomplished previously.
To prevent power turbine rotor failure, which could result in loss of engine power, accomplish the following:
(a) For all LTS101 series turboshaft engines except the LTS101-750B2 model, and all LTP101 series turboprop engines, remove and replace power turbine rotors identified in Table 1 of Textron Lycoming Service Bulletin (SB) No. LT101-72-50-0144, dated January 15, 1993, in accordance with the accomplishment procedures in Textron Lycoming SB No. LT101-72-50-0144, dated January 15, 1993, and the following schedule:
(1) For power turbine rotors with more than 1,000 hours time since new (TSN) on the effective date of this AD, remove and replace within the next 50 hours time in service (TIS), not to exceed 1,800 cycles since new (CSN).
(2) For power turbine rotors with 1,000 hours TSN or less, but more than 800 hours TSN on the effective date of this AD, remove and replace within the next 100 hours TIS, not to exceed 1,800 CSN.
(3) For power turbine rotors with 800 hours TSN or less, but more than 400 hours TSN on the effective date of this AD, remove and replace within the next 150 hours TIS, not to exceed 1,800 CSN.
(4) For power turbine rotors with 400 hours TSN or less on the effective date of this AD, remove and replace no later than 600 hours TSN, not to exceed 1,800 CSN.
(b) For all LTS101-750B2 model engines, remove and replace power turbine rotors, in accordance with the accomplishment procedures of Textron Lycoming SB No. LT101-72-50-0145 dated November 27, 1991, within the next 100 hours TIS after the effective date of this AD, or 800 hours TSN on the power turbine rotor, whichever occurs first.
(c) 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 Principal 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.
(d) 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.
(e) The actions required by this AD shall be done in accordance with the following Textron Lycoming SB's:
Document No
Pages
Revision
Date
LT101-72-50-0144
1-9
Original
January 15, 1993
Total Pages: 9.
LT101-72-50-0145
1-3
Original
November 27, 1991
Total Pages: 3.
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 Engines, 111 South 34th Street, Phoenix, AZ 85072; telephone (602) 365-2493, fax (602) 365-2210. 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.
(f) This amendment becomes effective on August 12, 1996.