Airworthiness Directive · Amendment 39-14050 · 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
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
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.
The FAA is superseding an existing airworthiness directive (AD), which applies to certain 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. That AD currently requires replacement of the transformer rectifier units (TRUs) in the avionics compartment with new, improved TRUs. This new AD requires replacement of the TRUs installed according to the existing AD with different TRUs that are improved. This AD is prompted by analysis that has revealed that certain diodes installed in the TRUs are the main factor contributing to the continuing TRU failures. We are issuing this AD to prevent failure of the TRUs. Failure of multiple TRUs 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.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
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.
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.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
