SF340 CREW HAD A BURNING SMELL IN THE COCKPIT.

Narrative

WE NOTICED A BURNING SMELL ON THE FLT DECK. WE WERE UNABLE TO IDENT THE SOURCE. THE FLT ATTENDANT WAS ASKED IF SHE HAD SMOKE OR COULD SMELL ANYTHING BURNING. SHE REPLIED; NO SHE COULD NOT. AN EMER WAS DECLARED AND WE RETURNED TO DFW; WHICH WAS APPROX 35 NM AWAY. CFR WAS PRESENT UPON LNDG AND FOLLOWED US TO THE GATE. THE BURNING SMELL DISSIPATED AFTER APPROX 2 MINS; AND THE SOURCE WAS NEVER IDENTED. THE FLT ATTENDANT HAD PREPARED THE CABIN FOR AN EMER EVAC AS DIRECTED. SINCE THE BURNING SMELL WAS NO LONGER PRESENT; WE DEPLANED THE PAX THROUGH THE MAIN CABIN DOOR IN THE NORMAL FASHION. A MAINT WRITE-UP WAS MADE AND HOW IT WAS RESOLVED IS UNKNOWN TO ME AT THIS TIME. SUPPLEMENTAL INFO FROM ACN 440733: THE CAPT OF MY FLT NOTICED A BURNING SMELL ON THE FLT DECK. AN EMER WAS DECLARED AS WE TURNED BACK TO DFW; APPROX 35 NM AWAY. THE CAPT CALLED THE FLT ATTENDANT TO ASK HER IF SHE SMELLED THE SMOKE AS WELL. CAPT BRIEFED FLT ATTENDANT TO EXPECT AN EVAC. ON THE FLT DECK; ALL ASSOCIATED CHKLISTS WERE RUN; AND THE SMELL OF THE FUMES SUBSIDED IN APPROX 2 MINS. THE ACFT LANDED AT DFW WITHOUT FURTHER INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CREW WAS FLYING A SAAB 340B ACFT. THE CAPT RPTED THE ODOR WAS ELECTRICAL IN NATURE. AFTER LNDG; THE ACR MAINT DEPT REMOVED THE ACFT FROM SVC FOR AN EXTENSIVE INSPECTION. THE CAPT DOES NOT KNOW WHAT WAS FOUND. HE FLEW THIS ACFT ABOUT 10 DAYS LATER AND THINGS WERE NORMAL AT THAT TIME.