Airworthiness Directive · Amendment 39-14885 · Airbus Model A310-300 Airplanes
Airbus Model A310-300 Airplanes
This AD applies to Airbus Model A310-304, -308, -324, and -325 airplanes, certificated in any category; equipped with one or more auxiliary center tanks (ACTs); on which either Airbus (production) Modifications 6918 and 6919 or 6918, 6919, and 8339 have been installed; except those on which Airbus Modification 8928 has been done in production.
The FAA is adopting a new airworthiness directive (AD) for certain Airbus Model A310-300 airplanes. This AD requires replacing the existing non-return valve (NRV) of the auxiliary center tanks (ACTs) of the fuel system with a new, improved NRV. This AD results from a report that it was not possible to transfer fuel from ACTs 1 and 2 during flight, and no electronic centralized aircraft monitor warnings were triggered. Investigation revealed a faulty static inverter and blown fuse, resulting in failure of certain fueling bus bars and subsequent failure of the automatic ACT fuel transfer. We are issuing this AD to prevent these failures, combined with failure of the NRV to close. If the NRV is open during flight, the fuel supply to the engines may be reduced during cross-feed operation to the extent that fuel starvation could occur and result in engine flameout.
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 15,000 flight hours after the effective date of this AD: Replace the existing NRV with a new, improved NRV by doing all the actions in accordance with the Accomplishment Instructions of Airbus Service Bulletin A310-28-2158, dated September 1, 2005.
Note 1: The Airbus service bulletin refers to Lucas Air Equipment Service Bulletin C23AE01-28-01, Revision 1, dated July 20, 1994, as an additional source of service information for replacing the NRV.
As of the effective date of this AD, no person may install, on any airplane, a NRV having part number C23AE0102, unless it has been modified according to paragraph (f) of this AD.
