AD 2005-07-25 Airworthiness Directives; Airbus Model A300 B2 and B4 Series Airplanes; Model A300 B4-600, A300 B4-600R, A300 C4-605R Variant F, and A300 F4-600R (Collectively Called A300-600) Series Airplanes; and Model A310 Series Airplanes

Models named: A300 B2, B4 series, A310 series. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to Model A300 B2 and B4 series airplanes; Model A300 B4-600, A300 B4-600R, A300 C4-605R Variant F, and A300 F4-600R (collectively called A300-600) series airplanes; and Model A310 series airplanes; certificated in any category; except those on which Airbus Modification 12540 has been accomplished.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Replacement of TRUs (f) Within 36 months after the effective date of this AD, replace the existing TRUs, having P/N F11QY3121, in the avionics compartment with new, improved TRUs having P/N F11QY3714, according to the Accomplishment Instructions of Airbus Service Bulletin A300-24-0099 (for Model A300 B2 and B4 series airplanes), A300-24-6082 (for Model A300-600 series airplanes), or A310-24-2088 (for Model A310 series airplanes); all Revision 01; all dated December 18, 2003; as applicable. Note 1: Airbus Service Bulletins A300-24-0099, A300-24-6082, and A310-24-2088; all Revision 01; refer to Thales Service Bulletin F11QY3121-24-003, dated October 15, 2002, as an additional source of service information for modifying the existing TRUs to the improved configuration. Thales Service Bulletin F11QY3121-24-003 specifies that Auxilec Service Bulletins F11QY3121-24-001, dated February 2, 1998; and F11QY3121-24-002, dated October 5, 2000; must be done to add Amendments A and B, respectively, to P/N F11QY3121 before the TRU can be modified to P/N F11QY3714 according to Thales Service Bulletin F11QY3121-24-003. Note 2: The Accomplishment Instructions of Thales Service Bulletin F11QY3121-24-003 specify to “complete implementation of the [Service Information Letter] SIL F11QY3121-24-004.” This AD does not require doing the service information letter. Actions Accomplished Previously (g) Replacements done before the effective date of this AD according to Airbus Service Bulletin A300-24-0099 (for Model A300 B2 and B4 series airplanes), A300-24-6082 (for Model A300-600 series airplanes), or A310-24-2088 (for Model A310 series airplanes); all dated October 11, 2002; as applicable; are acceptable for compliance with the corresponding action required by paragraph (f) of this AD. Alternative Methods of Compliance (AMOCs) (h) The Manager, International Branch, ANM-116, Transport Airplane Directorate, FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19. Related Information (i) French airworthiness directive 2003-082R1, dated March 31, 2004, also addresses the subject of this AD. Material Incorporated by Reference (j) You must use Airbus Service Bulletin A300-24-0099, Revision 01, dated December 18, 2003; Airbus Service Bulletin A300-24-6082, Revision 01, dated December 18, 2003; or Airbus Service Bulletin A310-24-2088, Revision 01, dated December 18, 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. To get copies of the service information, go to Airbus, 1 Rond Point Maurice Bellonte, 31707 Blagnac Cedex, France. To view the AD docket, go to the Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street SW., room PL-401, Nassif Building, Washington, DC. To review copies of the service information, go to 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 March 31, 2005. Kalene C. Yanamura, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 05-6914 Filed 4-8-05; 8:45 am] BILLING CODE 4910-13-P

This AD was prompted by analysis that has revealed that certain diodes installed in the transformer rectifier units (TRUs) are the main factor contributing to the continuing TRU failures. We are issuing this AD to prevent failure of multiple TRUs, which could result in loss of the thrust reversers, autothrottle, flaps, and various systems (wing/cockpit window anti-ice, trim tank pumps, and windshield wipers) on the airplane; or display of incorrect information to the flightcrew.