AD 2008-08-12 Airworthiness Directives; Boeing Model 757 Airplanes

Models named: 757-200, -200PF, -200CB, -300 series. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to all Boeing Model 757-200, -200PF, -200CB, and -300 series airplanes, certificated in any category.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Repetitive Inspections/Corrective Action (f) At the applicable times specified in paragraph 1.E., “Compliance,” of Boeing Special Attention Service Bulletin 757-30-0021 or 757-30-0022, both Revision 1, both dated June 13, 2007, as applicable; except where the service bulletins specify starting the compliance time “ * * * from the date on this service bulletin,” this AD requires starting the compliance time from the effective date of this AD: Perform detailed inspections for cracks of the anchor tab of the bulkhead seal assemblies of the wing TAI system at certain outboard stations of the left and right wings by doing all the actions, including all applicable corrective actions, in accordance with the Accomplishment Instructions of the applicable service bulletin. Do all applicable corrective actions before further flight. Optional Terminating Action (g) Installing a new duct anchor support bracket adjacent to the bulkhead seal assemblies in accordance with Part 2 of the Accomplishment Instructions of Boeing Special Attention Service Bulletin 757-30-0021 or 757-30-0022, both Revision 1, both dated June 13, 2007, as applicable, ends the repetitive inspections required by paragraph (f) of this AD. Credit for Actions Done According to Previous Issue of Service Information (h) Actions accomplished before the effective date of this AD in accordance with Boeing Special Attention Service Bulletins 757-30-0021 and 757-30-0022, both dated August 15, 2006, are considered acceptable for compliance with the corresponding actions specified in 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) 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 Special Attention Service Bulletin 757-30-0021, Revision 1, dated June 13, 2007; or Boeing Special Attention Service Bulletin 757-30-0022, Revision 1, dated June 13, 2007; as applicable; 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 April 3, 2008. Dionne Palermo, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E8-7662 Filed 4-11-08; 8:45 am] BILLING CODE 4910-13-P

This AD results from reports of cracks found at the anchor tab of the bulkhead seal assemblies of the wing thermal anti-ice (TAI) system. In one incident, the anchor tab and bulkhead seal assembly had separated because of the cracks. We are issuing this AD to prevent failure of the anchor tab of the bulkhead seal assembly, which in icing conditions could result in insufficient airflow to the wing TAI system, subsequent ice on the wings, and consequent reduced controllability of the airplane.