What was found
FLT 175 - DURING FLT, PAX AND F/A REPORTED A STRONG ELECT BURNING ODOR AT OVER WING AREA, F/O VERIFIED BURNING ODOR AND A/C DIVERTED. ENGS WERE RUN TO T/O POWER AND PACKS WERE OPERATED BOTH SEPARATE AND TOGETHER IN BOTH THE HOT AND COLD MODE. HYD PUMPS WERE OP CKD AND INSPECT. CIDS PANEL WAS CKD FOR STATUS FAULTS AND THE CFDS WAS CKD FOR POST FLT REPORTS. ALL SYSTEMS OPED NORM AND NO DEFECTS NOTED. PREPARING FOR DEPARTURE, A BURNING ODOR WAS NOTICED AT MID CABIN, ONBOARD MAINT TECH FOUND ODOR FROM AFT CABIN FAN (14HG), BOTH FWD AND AFT RECIRC FANS WERE PLACED ON MEL 21-21-01 COND. 2. A/C DEPARTED AND ARRIVED WITHOUT FURTHER INCIDENT. MAINT R/R THE RT RECIRC FAN (14HG) AND FILTERS, OP CK WAS GOOD.