AD 2008-02-16 Airworthiness Directives; Boeing Model 767-200 and 767-300 Series Airplanes

Models named: 767-200, 767-300 series. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to Model 767-200 and 767-300 series airplanes, certificated in any category; as identified in Boeing Service Bulletin 767-21A0167, Revision 1, dated December 19, 2006; excluding variable number VK031.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. ECS Duct Assembly Rework (f) Except as provided by paragraph (g) of this AD, within 72 months after the effective date of this AD, rework the duct assemblies in the ECS for the air distribution system at sections 41, 45, and 46; the Gasper air system at sections 41, 43, 45, and 46; the forward electronic and electrical (E/E) compartment air supply; and the instrument panel cooling supply; in accordance with the Accomplishment Instructions and Appendices A and B of Boeing Service Bulletin 767-21A0167, Revision 1, dated December 19, 2006. Optional Part Installed (g) If an affected duct assembly having a part number other than part number 217T2109-12, or a part number other than any part number specified in the applicable figure of Boeing Service Bulletin 767-21A0167, Revision 1, dated December 19, 2006, is found installed, and that part number is listed as an optional part number in the table in paragraph 3.B.2., “Optional Part Table,” of the Accomplishment Instructions of the service bulletin: No rework is required for that duct assembly only. Parts Installation (h) As of the effective date of this AD, no person may install on any airplane an air distribution system, Gasper air system, forward E/E compartment air supply, or instrument panel cooling supply duct assembly with BMS 8-39 polyurethane foam insulation. 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) 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 Boeing Service Bulletin 767-21A0167, Revision 1, dated December 19, 2006, to do the actions required by this AD, unless the AD specifies otherwise. (1) The Director of the Federal Register approved the incorporation by reference of this service information under 5 U.S.C. 552(a) and 1 CFR part 51. (2) For service information identified in this AD, contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207. (3) You may review copies of the service information incorporated by reference 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/code_of_federal_regulations/ibr_locations.html . Issued in Renton, Washington, on January 14, 2008. Stephen P. Boyd, Assistant Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E8-972 Filed 1-23-08; 8:45 am] BILLING CODE 4910-13-P

This AD results from reports of duct assemblies in the environmental control system (ECS) with burned Boeing Material Specification (BMS) 8-39 polyurethane foam insulation. This AD also results from a report from the airplane manufacturer that airplanes were assembled with duct assemblies in the ECS wrapped with BMS 8-39 polyurethane foam insulation, a material of which the fire retardant properties deteriorate with age. We are issuing this AD to prevent a potential electrical arc from igniting the BMS 8-39 polyurethane foam insulation on the duct assemblies or the ECS, which could propagate a small fire and lead to a larger fire that might spread throughout the airplane through the ECS.