97-25-08: Airworthiness Directives; General Electric Company CJ610 Series Turbojet and CF700 Series Turbofan Engines

97-25-08 General Electric Company: Amendment 39-10232. Docket 97-ANE-21. Applicability: General Electric Company (GE) CJ610 series turbojet and CF700 series turbofan engines, with turbine torque rings and compressor drive shafts identified in GE CF700 Service Bulletin (SB) No. A72-155, dated May 22, 1997, and GE CJ610 SB No. A72-147, dated May 22, 1997. These engines are installed on but not limited to the following aircraft: Learjet 20 series, Israel Aircraft Industries Westwind series, Hansa Jet, Aero Commander Jet Commander, Dassault Falcon 20 series, Sabreliner 265 series. Note 1: 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 request approval for an alternative method of compliance in accordance with paragraph (d) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it. Compliance: Required as indicated, unless accomplished previously. To prevent turbine torque ring or compressor drive shaft failure due to a manufacturing defect, which could result in an uncontained engine failure, accomplish the following: (a) For GE CF700 series turbofan engines, accomplish the following in accordance with GE CF700 SB No. A72-155, dated May 22, 1997: (1) Remove from service affected turbine torque rings, listed by serial number (S/N) in paragraph 1.A. (3a) of GE CF700 SB No. A72-155, dated May 22, 1997, and replace with serviceable parts, within 50 hours time in service (TIS), or 60 days after the effective date of this AD, whichever occurs first. (2) Remove from service affected turbine torque rings and compressor drive shafts, listed by S/N in paragraph 1.A (3b) of GE CF700 SB No. A72-155, dated May 22, 1997, and replace with serviceable parts, within 300 hours TIS, or 12 months after the effective date of this AD, whichever occurs first. (b) For GE CJ610 series turbojet engines, accomplish the following in accordance with GE CJ610 SB No. A72-147, dated May 22, 1997: (1) Remove from service affected turbine torque rings, listed by S/N in paragraph 1.A. (3a) of GE CJ610 SB No. A72-147, dated May 22, 1997, and replace with serviceable parts, within 50 hours TIS, or 60 days after the effective date of this AD, whichever occurs first. (2) Remove from service affected turbine torque rings and compressor drive shafts, listed by S/N in paragraph 1.A. (3b) of GE CJ610 SB No. A72-147, dated May 22, 1997, and replace with serviceable parts, within 300 hours TIS, or 12 months after the effective date of this AD, whichever occurs first. (c) After the effective date of this AD, installation of uninstalled affected parts identified by S/N in the SBs referenced in paragraphs (a) and (b) of this AD is prohibited. (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. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Engine Certification Office. Note 2: 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 wherethe requirements of this AD can be accomplished. (f) The actions required by this AD shall be done in accordance with the following GE service documents: Document No. Pages Date CF700 SB No. A72-155 1-9 May 22, 1997 Total Pages: 9. CJ610 SB No. A72-147 1-9 May 22, 1997 Total Pages: 9. 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 GE Aircraft Engines, 1000 Western Ave., Lynn, MA 01910; telephone (781) 594-3140, fax (781) 594-4805. 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 January 2, 1998.