A B757-200'S L FUEL GAUGE BLANKED AFTER TKOF AND BECAME OPERABLE PRIOR TO LNDG. CREW SUSPECTS POSSIBLE PED INTERFERENCE.

Narrative

SHORTLY AFTER TKOF; THE L FUEL GAUGE BLANKED FOLLOWED SHORTLY AFTER BY THE TOTAL FUEL GAUGE. WHILE IN CLB; THE GAUGE CAME BACK FOR A FEW SECONDS THEN BLANKED AGAIN. THE L FUEL GAUGE REMAINED THAT WAY UNTIL THE LNDG PA WAS GIVEN; THEN SHORTLY AFTER THAT THE L FUEL GAUGE FUNCTIONED NORMAL. SUSPECT POSSIBLE INTERFERENCE FROM PAX ELECTRONIC DEVICE. UNFORTUNATELY THERE WAS NO TIME BEFORE ARR TO SEE IF THIS WAS THE CASE. SUGGEST THAT FLT CREWS BE MADE AWARE THAT THIS IS A POSSIBILITY IN THE EVENT SEE A BLANKING OF THE L FUEL GAUGE.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT GAUGE OPERATION/INOP WAS LIKE AN ON/OFF SWITCH AT APPROX 10000 FT COINCIDING WITH THE FLT ATTENDANT CABIN PED ANNOUNCEMENT. RPTR CAN NOT CHK HIS ACR'S ACFT MAINT RECORDS TO DETERMINE IF A MECHANICAL FAILURE WAS DISCOVERED DURING POST FLT MAINT. THE RPTR DID STATE THAT THE FAILURE'S POTENTIAL CAUSE DID NOT DAWN ON HIM UNTIL JUST PRIOR TO LNDG AND THEREFORE RPTR COULD NOT TROUBLESHOOT POSSIBLE DEVICE INTERFERENCE. THE RPTR INDICATED THAT THEY HAVE HEARD OF THIS EVENT OCCURRING ON OTHER B757 ACFT.