AD 2005-06-02 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 Boeing Model 757-200 series airplanes, certificated in any category; as identified in Boeing Service Bulletin 757-33-0050, Revision 2, dated December 4, 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) Within 60 months after the effective date of this AD: Modify the wiring of the test ground signal for the master dim and test system circuit in the flight compartment by doing all the applicable actions specified in Boeing Service Bulletin 757-33-0050, Revision 2, dated December 4, 2003. Modifications Done Using Previous Issues of the Service Bulletin (g) Modifications done before the effective date of this AD in accordance with Boeing Special Attention Service Bulletin 757-33-0050, dated August 15, 2002; or Revision 1, dated January 30, 2003; are considered acceptable for compliance with paragraph (f) of this AD. Alternative Methods of Compliance (AMOCs) (h) 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 (i) You must use Boeing Service Bulletin 757-33-0050, Revision 2, dated December 4, 2003, 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 this document 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 March 7, 2005. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 05-5015 Filed 3-15-05; 8:45 am] BILLING CODE 4910-13-P

This AD was prompted by a report that the master dim and test system circuit does not have wiring separation of the test ground signal for redundant equipment in the flight compartment. We are issuing this AD to prevent a single fault failure during flight which could result in test patterns instead of the selected radio frequencies showing on the communications panel. These conditions could adversely affect voice and transponder communication capability between the flightcrew and air traffic control, which could result in increased pilot workload.