What was found
REPORTED (AFT FUEL LOW) LIGHT ILLUMINATING WITH 300-400 LBS REMAINING ON GAUGE. (SHOULD BE 110 LBS). TROUBLESHOOTING REVEALED FLAPPER PAD (SEAL) WAS DETERIORATED TO THE CONSISTENCY OF A (GUMMY BEAR). AS FUEL IS MOVED INTO THE NR 5 (ENG FEED) TANK, BY MOTIVE FLOW SYSTEM, IT WOULD BEAK BACK OUT THROUGH THIS SEAL INTO SUBSIDIARY CELLS. A/C UNABLE TO KEEP NR 5 CELL FULL. A CALL TO MFG REVEALED THIS HAS BEEN REPORTED SEVERAL TIMES WHEN A/C OPERATED IN HOT ENVIRONMENTS. (S. AFRICA) THIS A/C OPERATED FROM ID TO NEW MEX. MFG CLAIMS WORKING ON DEVELOPING NEW SEAL.