AD 2005-25-17 Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135BJ, -135ER, -135KE, -135KL, and -135LR Airplanes; and Model EMB-145, 145ER, -145MR, -145LR, -145XR, -145MP, and -145EP Airplanes

Models named: EMB-135BJ, -135ER, -135KE, -135KL, -135LR, EMB-145, -145ER, -145MR, -145LR, -145XR. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to EMBRAER Model EMB-135BJ, -135ER, -135KE, -135KL, and -135LR airplanes; and Model EMB-145, -145ER, -145MR, -145LR, -145XR, -145MP, and -145EP airplanes; certificated in any category; equipped with Model C-14 auxiliary power units (APUs); except those airplanes with serial numbers 14500927 and subsequent.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Installation of Scavenge Pump Drain (f) Within 5,000 flight hours after the effective date of this AD, modify the APU compartment drain system by installing a scavenge pump on it by doing all actions specified in the Accomplishment Instructions of EMBRAER Service Bulletin 145LEG-49-0006 (for Model EMB-135BJ airplanes), dated April 20, 2005; or 145-49-0029 (for all remaining airplanes), Revision 02, dated October 14, 2005. A modification before the effective date of this AD in accordance with EMBRAER Service Bulletin 145-49-0029, dated April 20, 2005; or Revision 01, dated July 13, 2005, is also acceptable for compliance with the requirements of this paragraph, as applicable. Concurrent Requirements (g) For airplanes with an APU cowling part number 145-52979-401 or 145-52979-403: Before or concurrently with the pump drain installation required by paragraph (f) of this AD, replace the APU exhaust assembly by doing all actions specified in the Accomplishment Instructions of EMBRAER Service Bulletin 145-49-0023, Revision 01, dated April 25, 2005. Replacement before the effective date of this AD in accordance with EMBRAER Service Bulletin 145-49-0023, dated November 23, 2004, is also acceptable for compliance with the requirements of this paragraph. 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 § 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 2005-08-05, effective September 6, 2005, also addresses the subject of this AD. Material Incorporated by Reference (j) To perform the actions that are required by this AD, unless the AD specifies otherwise, you must use the service bulletins identified in Table 1 of this AD, as applicable. 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. For a copy of this service information, contact Empresa Brasileira de Aeronautica S.A. (EMBRAER), P.O. Box 343—CEP 12.225, Sao Jose dos Campos—SP, Brazil. 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. Table 1.—Material Incorporated by Reference Service bulletin Revision level Date EMBRAER Service Bulletin 14LEG-49-0006 Original April 20, 2005. EMBRAER Service Bulletin 145-49-0029 02 October 14, 2005. EMBRAER Service Bulletin 145-49-0023 01 April 25, 2005. Issued in Renton, Washington, on December 2, 2005. Kalene C. Yanamura, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 05-23899 Filed 12-13-05; 8:45 am] BILLING CODE 4910-13-P

This AD results from a report of fuel leaking from the APU feeding line and accumulating inside the APU compartment because the drain system is inadequate when the APU is running. We are issuing this AD to prevent fuel accumulation and subsequent flammable fuel vapors in the APU cowling, which, combined with an ignition source, could result in a fire or explosion.