2007-09-03: Auxiliary power unit (APU)

2007-09-03 LEARJET: Amendment 39-15033. Docket No. FAA-2007-27980; Directorate Identifier 2007-NM-066-AD. Effective Date (a) This AD becomes effective May 11, 2007. Affected ADs (b) None. Applicability (c) This AD applies to Learjet Model 45 airplanes, certificated in any category; serial numbers 45-005 through 45-321, equipped with an auxiliary power unit (APU). Unsafe Condition (d) This AD results from reports of fuel leaking from the APU fuel shutoff valve into a flammable fluid fire protection area that is also interconnected with the main landing gear's wheel well bay. We are issuing this AD to prevent fuel leaking from the fuel shutoff valve of the APU, which could result in an uncontrollable fire and adversely affect the airplane's continued safe flight and landing. Compliance (e) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.Deactivation of the APU and Removal of the APU Fuel Shutoff Valve (f) Within 50 flight hours after the effective date of this AD, deactivate the APU, cap/plug the fuel lines to the APU, and remove the APU fuel shutoff valve, in accordance with the Accomplishment Instructions of Bombardier Alert Service Bulletin A45-49-11, dated March 26, 2007. Differences From the Service Information (g) Although Bombardier Alert Service Bulletin A45-49-11, dated March 26, 2007, specifies to submit certain information to the manufacturer and send the APU fuel shutoff valve to Learjet, this AD does not include those requirements. Special Flight Permit (h) 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 airplane to a location where the requirements of this AD can be accomplished, provided the APU is not used. Alternative Methods of Compliance (AMOCs) (i)(1)The Manager, Wichita Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19. (2) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. Material Incorporated by Reference (j) You must use Bombardier Alert Service Bulletin A45-49-11, dated March 26, 2007, to perform the actions that are required by this AD, unless the AD specifies otherwise. The Director of the Federal Register approved the incorporation by reference of this document in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Learjet, Inc., One Learjet Way, Wichita, Kansas 67209-2942, for a copy of this service information. Youmay review copies at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html .