Narrative:

On takeoff at ZZZ, the left dc second 2 circuit breaker tripped causing he loss of 31 aircraft systems. Flight immediately diverted to ZZZ1 due to WX in ZZZ. Emergency declared. Landing uneventful. Callback conversation with the reporter revealed the following information: the reporter state on takeoff climb the first officer reported the airplane was trimming nose down and the main electric trim was inoperative. The reporter said the first officer requested the captain to take over which he did using the auxiliary trim system to establish a normal climb. The reporter checked the cockpit and found several systems inoperative and then declared an emergency and diverted. The reporter stated when checking the circuit breaker panel it was found the left dc bus section 2 circuit breaker tripped. The reporter said this circuit breaker feeds twelve separate systems an non of the individual system breakers were found tripped. The reporter stated the main electric trim was operative prior to takeoff and the trim was set for the correct weight and balance. The reporter stated the circuit breaker was not reset until maintenance worked the airplane. The reporter said maintenance found nothing as all twelve system breakers were set and operated normally. The reporter stated the circuit breaker C883 was removed for investigation. The reporter said the airplane was returned to service and operated normally.

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Original NASA ASRS Text

Title: A B767-300 ON TKOF CLB DECLARED AN EMER AND DIVERTED DUE TO LOSS OF MAIN ELECTRIC TRIM AND FLAP CTL CAUSED BY A CB TRIP.

Narrative: ON TKOF AT ZZZ, THE LEFT DC SEC 2 CB TRIPPED CAUSING HE LOSS OF 31 ACFT SYSTEMS. FLT IMMEDIATELY DIVERTED TO ZZZ1 DUE TO WX IN ZZZ. EMER DECLARED. LNDG UNEVENTFUL. CALLBACK CONVERSATION WITH THE RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATE ON TAKEOFF CLIMB THE FO RPTED THE AIRPLANE WAS TRIMMING NOSE DOWN AND THE MAIN ELECTRIC TRIM WAS INOPERATIVE. THE RPTR SAID THE FO REQUESTED THE CAPT TO TAKE OVER WHICH HE DID USING THE AUXILIARY TRIM SYSTEM TO ESTABLISH A NORMAL CLIMB. THE RPTR CHKED THE COCKPIT AND FOUND SEVERAL SYSTEMS INOPERATIVE AND THEN DECLARED AN EMERGENCY AND DIVERTED. THE RPTR STATED WHEN CHKING THE CIRCUIT BREAKER PANEL IT WAS FOUND THE LEFT DC BUS SECTION 2 CIRCUIT BREAKER TRIPPED. THE RPTR SAID THIS CIRCUIT BREAKER FEEDS TWELVE SEPARATE SYSTEMS AN NON OF THE INDIVIDUAL SYSTEM BREAKERS WERE FOUND TRIPPED. THE RPTR STATED THE MAIN ELECTRIC TRIM WAS OPERATIVE PRIOR TO TAKEOFF AND THE TRIM WAS SET FOR THE CORRECT WEIGHT AND BALANCE. THE RPTR STATED THE CIRCUIT BREAKER WAS NOT RESET UNTIL MAINT WORKED THE AIRPLANE. THE RPTR SAID MAINT FOUND NOTHING AS ALL TWELVE SYSTEM BREAKERS WERE SET AND OPERATED NORMALLY. THE RPTR STATED THE CIRCUIT BREAKER C883 WAS REMOVED FOR INVESTIGATION. THE RPTR SAID THE AIRPLANE WAS RETURNED TO SERVICE AND OPERATED NORMALLY.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.