96-25-12: Auxiliary Power Units

96-25-12 SUNDSTRAND AEROSPACE: Amendment 39-9855. Docket 96-ANE-27. \n\n\tApplicability: Sundstrand Aerospace Models T-62T-40C series auxiliary power units (APUs), with compressor wheel, Part Numbers (P/Ns) 162690-1, 165111-1, and 167200-1. These APUs are installed on but not limited to Aerospatiale AS332 Super Puma, Boeing 707 series, British Aerospace HS 748 series, Cessna 650 series, General Dynamics 340, 440, and 880 series, Dassault Aviation Falcon 20, 50 and 200 series, de Havilland DHC-7 and DHC-8 series, Embraer 120 series, Fokker F.27 series, Gulfstream Aerospace Corporation 159, 1159, and G-III series, Raytheon Aircraft Company HS.125 700A, Lockheed-Georgia 1329 series, Raytheon Aircraft Company BAe 125 series, Sabreliner Corporation NA-265 series aircraft. \n\n\tNote 1: This airworthiness directive (AD) applies to each APU 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 APUs 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 (c) 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. \n\n\tCompliance: Required as indicated, unless accomplished previously. \n\n\tTo prevent compressor wheel rupture, which could result in an uncontained APU failure and damage to the aircraft, accomplish the following: \n\n\t(a)\tRemove from service compressor wheels in accordance with the procedures described in the Accomplishment Instructions of Sundstrand Aerospace Service Bulletin (SB) No. SB-T-62T-49-120, Revision 2, dated November 5, 1996, Revision 1, dated September 9, 1996, or Original, dated July 22, 1996, and the drawdown schedule described in Table 2 of Revision 2 only, dated November 5, 1996, and replace with serviceable parts. \n\n\t(b)\tThis AD establishes a new life limit of 6,000 cycles for existing uninstalled compressor wheels, identified as Sundstrand P/Ns 162690-1, 165111-1, and 167200-1. \n\n\t(c)\tAn 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, Los Angeles Aircraft 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, Los Angeles Aircraft Certification Office. \n\n\tNote 2: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Los Angeles Aircraft Certification Office. \n\n\t(d)\tSpecial 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. \n\n\t(e)\tThereafter, except as provided in paragraphs (c) and (d) of this AD, no alternative replacement time may be approved for compressor wheels, identified as Sundstrand P/Ns 162690-1, 165111-1, and 167200-1. \n\n\t(f)\tThe actions required by this AD shall be done in accordance with the following Sundstrand Aerospace SBs: \n\n\nDocument No.\nRevision\nPages\nDate \nSB-T-62-T-49-120\n2\n1-9\nNovember 5, 1996 \nTotal pages: 9. \n\n\n\n\n\n\n\nSB-T-62-T-49-120\n1\n1-9\nSeptember 9, 1996 \nTotal pages: 9. \n\n\n\n\n\n\n\nSB-T-62-T-49-120\nOriginal\n1-9\nJuly 22, 1996 \nTotal pages\n\n\n\n\nThis 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 Sundstrand Aerospace, 4400Ruffin Rd., P.O. Box 85757, San Diego, CA 92186-5757; telephone (619) 627-6303, fax (619) 627-6473. 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. \n\n\t(g)\tThis amendment becomes effective on January 13, 1997.