AD 2006-15-05 Airworthiness Directives; Boeing Model 737-200, -300, and -400 Series Airplanes

Models named: 737-200, -300, -400 series. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to Boeing Model 737-200, -300, and -400 series airplanes, certificated in any category, equipped with auxiliary fuel tanks.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Replacement (f) Within 24 months after the effective date of this AD: Replace the existing fueling float switch in the auxiliary fuel tank with a new, improved fueling float switch, install a new liner system inside the float switch conduit, and perform related investigative and other specified actions, by doing all of the actions in accordance with Part A of the Accomplishment Instructions of Boeing Service Bulletin 737-28A1192, Revision 2, dated April 27, 2006. Note 1: This AD does not require doing the actions in Part B of the Accomplishment Instructions of Boeing Service Bulletin 737-28A1192, Revision 2, dated April 27, 2006. Parts Installation (g) As of the effective date of this AD, no person may install a fueling float switch having P/N F8300-146 on the auxiliary fuel tank of any airplane. Actions Accomplished Previously (h) Replacements and conduit liner system installations accomplished before the effective date of this AD in accordance with Boeing Alert Service Bulletin 737-28A1192, dated March 27, 2003; or Boeing Service Bulletin 737-28A1192, Revision 1, dated August 21, 2003; are acceptable for compliance with the requirements of this AD. Alternative Methods of Compliance (AMOCs) (i)(1) The Manager, Seattle Aircraft Certification Office, 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 14 CFR 39.19 on any airplane to which the AMOC applies, notify the appropriate principal inspector in the FAA Flight Standards Certificate Holding District Office. Material Incorporated by Reference (j) You must use Boeing Service Bulletin 737-28A1192, Revision 2, dated April 27, 2006, 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 Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207, 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. Issued in Renton, Washington, on July 7, 2006. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E6-11418 Filed 7-19-06; 8:45 am] BILLING CODE 4910-13-P

This AD was prompted by reports of chafing of the direct-current-powered float switch wiring insulation in the center fuel tank. We are issuing this AD to prevent contamination of the fueling float switch of the auxiliary fuel tank by moisture or fuel, and chafing of the float switch wiring against the float switch conduit in the fuel tank, which could present an ignition source inside the fuel tank that could cause a fire or explosion.