AD 2005-12-11 Airworthiness Directives; Boeing Model 757-200 Series Airplanes

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

This AD applies to Model 757-200 series airplanes, certificated in any category, as listed in Boeing Service Bulletin 757-25-0255, dated December 11, 2003.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Modification (f) For all airplanes: Within 18 months after the effective date of this AD modify the frequency converters located in the closet assembly in the passenger compartment by doing all the applicable actions in accordance with the Accomplishment Instructions of Boeing Service Bulletin 757-25-0255, dated December 11, 2003. Prior or Concurrent Modification (g) For Group 1 airplanes identified in Boeing Service Bulletin 757-24-0093, dated August 14, 2003: Before or concurrent with accomplishment of paragraph (f) of this AD, modify the in-flight entertainment system by doing all the applicable actions in accordance with Boeing Service Bulletin 757-24-0093, dated August 14, 2003. Part Installation (h) As of the effective date of this AD, no person may install a frequency converter having part number 1-002-0102-0730 on any airplane unless that frequency converter has been modified as required by paragraph (f) of this AD. Alternative Methods of Compliance (AMOCs) (i) 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. Material Incorporated by Reference (j) You must use Boeing Service Bulletin 757-25-0255, dated December 11, 2003; and Boeing Service Bulletin 757-24-0093, dated August 14, 2003; as applicable; to perform the actions that are required by this AD, unless the AD specifies otherwise. The Director of the Federal Register approves the incorporation by reference of these documents in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. For copies of the service information, contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207. For information on the availability of this material at the National Archives and Records Administration (NARA), call (202) 741-6030, or go to http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. You may view the AD docket at the Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street SW., room PL-401, Nassif Building, Washington, DC. Issued in Renton, Washington, on May 27, 2005. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 05-11712 Filed 6-14-05; 8:45 am] BILLING CODE 4910-13-P

This AD was prompted by a certification review that revealed a frequency converter failure mode not identified in the original system design. We are issuing this AD to prevent a short circuit between the frequency converter output and the distribution circuit breakers, which could result in overheating and failure of adjacent wiring and consequent degraded operation of airplane systems.