2005-23-20: Auxiliary power unit (APU)

2005-23-20 Empresa Brasileira De Aeronautica S.A. (EMBRAER): Amendment 39-14378. Docket No. FAA-2005-22256; Directorate Identifier 2005-NM-113-AD. Effective Date (a) This AD becomes effective December 27, 2005. Affected ADs (b) None. Applicability (c) This AD applies to EMBRAER Model EMB-135BJ airplanes, as identified in EMBRAER Service Bulletin 145LEG-53-0020, Revision 01, dated September 21, 2005; and Model EMB-135ER, -135KE, -135KL, and - 135LR airplanes, and Model EMB-145, -145ER, -145MR, -145LR, -145XR, -145MP, and -145EP airplanes, as identified in EMBRAER Service Bulletin 145-53-0057, Revision 01, dated September 20, 2005; certificated in any category. Unsafe Condition (d) This AD results from the discovery of a hole in the upper frame of the firewall for the auxiliary power unit (APU). We are issuing this AD to ensure that the APU compartment is isolated from the rest of the airplane in the event of an APU fire. If the APU compartment is not isolated, smoke could enter the passenger cabin in the event of an APU fire. 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. Modification (f) Within 2,500 flight hours or 365 days after the effective date of this AD, whichever occurs later, modify the APU firewall upper frame, part number 145-51249-001 or 120-10731-001, in accordance with the Accomplishment Instructions of EMBRAER Service Bulletin 145LEG-53-0020, Revision 01, dated September 21, 2005 (for Model EMB-135BJ airplanes); or EMBRAER Service Bulletin 145-53-0057, Revision 01, dated September 20, 2005 (for Model EMB-135ER, -135KE, -135KL, and -135LR airplanes; and Model EMB-145, -145ER, -145MR, - 145LR, -145XR, -145MP, and -145EP airplanes); as applicable. Modifications Accomplished According to Previous Issue of Service Bulletins (g) Modifications accomplished before the effective date of this AD according to EMBRAER Service Bulletin 145LEG-53-0020, dated November 30, 2004; and EMBRAER Service Bulletin 145-53-0057, dated November 30, 2004; are considered acceptable for compliance with the corresponding action specified in this AD. Alternative Methods of Compliance (AMOCs) (h)(1) The Manager, International Branch, ANM-116, Transport Airplane Directorate, FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19. (2) Before using any AMOC approved in accordance with Sec. 39.19 on any airplane to which the AMOC applies, notify the appropriate principal inspector in the FAA Flight Standards Certificate Holding District Office. Related Information (i) Brazilian airworthiness directive 2005-04-03, dated April 30, 2005, also addresses the subject of this AD. Material Incorporated by Reference (j) You must use EMBRAER Service Bulletin 145LEG-53-0020, Revision 01, dated September 21, 2005; or EMBRAER Service Bulletin 145-53-0057, Revision 01, dated September 20, 2005; as applicable, 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 these documents in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Empresa Brasileira de Aeronautica S.A. (EMBRAER), P.O. Box 343--CEP 12.225, Sao Jose dos Campos-SP, Brazil, for a copy of this service information. You may review copies at the Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street, SW., room PL-401, Nassif Building, Washington, DC; on the Internet at http://dms.dot.gov; or at the National Archives and Records Administration (NARA). For information on the availability of this material at the NARA, call (202) 741-6030, or go to http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html .