What was found
DURING DESCENT, RECEIVED AN INTERMITTENT CHIME, WITH NO ECAM ALERT, INVESTIGATION FOUND LOW FUEL TANK AT 1.5 & RO AT 1.7. THE CENTER TANK WAS FEEDING & TRIM TANK TRANSFERRING FWD. UNABLE TO RECOVER INNER FUEL TANK & APPROXIMATELY 17600 LBS OF FUEL WAS TRAPPED AT SLAT EXTENSION. THE FUEL FEED DID NOT REVERT TO THE INNER TANKS & CENTRE TANKS CONTINUED TO BURN. LEFT & RT OUTER MAINTAINED 1.5 & 1.7 RESPECTIVELY, AT APPROXIMATELY 400. ON APPROACH THE FUEL FEED SWITCHED TO INNER TANK & THE CTR TANK PUMPS SHUT DOWN. R & R RELAYS IAW SMP. PERFORMED AUTO FUEL FEED OPS & FUNCTIONAL TESTED IAW AMM 28-21-00-05. CENTER TANK LOW LEVEL SENSOR CHECKED NORMAL IAW AMM 28-46-00-05, FUNCTIONAL TEST, ACFT OK FOR SERVICE.