AD 2005-20-41 Airworthiness Directives; Boeing Model 757-200, -200PF, and -300 Series Airplanes, Powered by Pratt & Whitney PW2000 Series Engines

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

This AD applies to Boeing Model 757-200, -200PF, and -300 series airplanes; certificated in any category; powered by Pratt & Whitney PW2000 series engines.

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 (f) Within 6,000 flight hours or 24 months after the effective date of this AD, whichever is first: Do a detailed inspection for loose or damaged components of the support brackets and associated fasteners for the hydraulic lines located in the nacelle struts by accomplishing all of the actions specified in Part 1, Part 2, and Part 3 of the Accomplishment Instructions of Boeing Service Bulletin 757-29-0064 (for Model 757-200 and -200PF series airplanes) or Boeing Service Bulletin 757-29-0065 (for Model 757-300 series airplanes), both dated February 29, 2004; as applicable. Repeat the inspection thereafter at intervals not to exceed 6,000 flight hours or 24 months, whichever is first. Note 1: For the purposes of this AD, a detailed inspection is defined as: “An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses, etc., may be used. Surface cleaning and elaborate access procedures may be required.” Concurrent Service Bulletin (g) Prior to or concurrently with the accomplishment of paragraph (f) of this AD: Accomplish all of the actions specified in the Accomplishment Instructions of Boeing Service Bulletin 757-29-0043, dated June 21, 1990. Note 2: The part numbers identified in Boeing Service Bulletins 757-29-0064 or 757-29-0065, both dated February 29, 2004; or Boeing Service Bulletin 757-29-0043, dated June 21, 1990; are acceptable configurations and fully comply with the AD requirements for the actions required by paragraphs (f) and (g) of this AD. Related Investigative and Corrective Actions (h) Except as required by paragraph (i) of this AD: If any loose or damaged part is found during any inspection required by paragraph (f) of this AD, before further flight, do all of the related investigative and corrective actions specified in Part 1 and Part 2 of the Accomplishment Instructions of Boeing Service Bulletin 757-29-0064, or Boeing Service Bulletin 757-29-0065, both dated February 29, 2004; as applicable. Repair Information (i) If any damage is found during any inspection required by this AD, and the service bulletin specifies contacting Boeing for appropriate action: Before further flight, repair per a method approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA. For a repair method to be approved, the approval letter must specifically refer to this AD. Note 3: There is no terminating action currently available for the repetitive inspections required by paragraph (f) of this AD. Alternative Methods of Compliance (AMOCs) (j)(1) The Manager, Seattle ACO, 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. Material Incorporated by Reference (k) You must use Boeing Service Bulletin 757-29-0064, dated February 29, 2004, or Boeing Service Bulletin 757-29-0065, dated February 29, 2004; and Boeing Service Bulletin 757-29-0043, dated June 21, 1990; 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 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 September 30, 2005. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 05-20264 Filed 10-12-05; 8:45 am] BILLING CODE 4910-13-P

This AD was prompted by reports of damage and subsequent failure of the support brackets and associated fasteners for the hydraulic lines located internal to the upper fairing cavity of the nacelle struts. We are issuing this AD to prevent such failure, which, in conjunction with sparking of electrical wires, failure of seals that would allow flammable fluids to migrate to compartments with ignition sources, or overheating of the pneumatic ducts beyond auto-ignition temperatures, could result in an uncontained fire.