Narrative:

The first officer moved the thrust levers forward, and got the takeoff warning horn. We immediately pulled them back and made a quick check -- stabilizer trim was in the green, I banged on the speed brake lever to the down detent. Checked flaps at the 5 degree detent and indicating 5 degrees, and the parking brake was off, and quickly reapplied power -- still got the horn and went back to idle and exited the runway. Again, we checked all the above items and recycled everything, and still got the horn. Finally we called dfw operations to ask for maintenance help and to return to the gate. We took one last general look around and found the leading edge device green lights on the overhead panel were extinguished. So, we looked again at the circuit breaker panels and discovered the leading edge device indicator circuit breaker had popped. We pushed the breaker back in, and with proper light indications, we solved the horn problem. We returned to the gate anyway just to give maintenance a chance to look at it. We cannot say when the breaker popped. If it was popped earlier, it is possible the first officer's shoulder harness could have hit it. If that's true, possibly a clear plastic shield would protect these and other circuit breakers from inadvertent popping. The new push button takeoff warning test being installed should also help catch these anomalies before the runway is taken.

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Original NASA ASRS Text

Title: AN ACR B737-300 CAPT HAD A TKOF ABORTED BECAUSE OF A POPPED CIRCUIT BREAKER.

Narrative: THE FO MOVED THE THRUST LEVERS FORWARD, AND GOT THE TKOF WARNING HORN. WE IMMEDIATELY PULLED THEM BACK AND MADE A QUICK CHK -- STABILIZER TRIM WAS IN THE GREEN, I BANGED ON THE SPD BRAKE LEVER TO THE DOWN DETENT. CHKED FLAPS AT THE 5 DEG DETENT AND INDICATING 5 DEGS, AND THE PARKING BRAKE WAS OFF, AND QUICKLY REAPPLIED PWR -- STILL GOT THE HORN AND WENT BACK TO IDLE AND EXITED THE RWY. AGAIN, WE CHKED ALL THE ABOVE ITEMS AND RECYCLED EVERYTHING, AND STILL GOT THE HORN. FINALLY WE CALLED DFW OPS TO ASK FOR MAINT HELP AND TO RETURN TO THE GATE. WE TOOK ONE LAST GENERAL LOOK AROUND AND FOUND THE LEADING EDGE DEVICE GREEN LIGHTS ON THE OVERHEAD PANEL WERE EXTINGUISHED. SO, WE LOOKED AGAIN AT THE CIRCUIT BREAKER PANELS AND DISCOVERED THE LEADING EDGE DEVICE INDICATOR CIRCUIT BREAKER HAD POPPED. WE PUSHED THE BREAKER BACK IN, AND WITH PROPER LIGHT INDICATIONS, WE SOLVED THE HORN PROB. WE RETURNED TO THE GATE ANYWAY JUST TO GIVE MAINT A CHANCE TO LOOK AT IT. WE CANNOT SAY WHEN THE BREAKER POPPED. IF IT WAS POPPED EARLIER, IT IS POSSIBLE THE FO'S SHOULDER HARNESS COULD HAVE HIT IT. IF THAT'S TRUE, POSSIBLY A CLR PLASTIC SHIELD WOULD PROTECT THESE AND OTHER CIRCUIT BREAKERS FROM INADVERTENT POPPING. THE NEW PUSH BUTTON TKOF WARNING TEST BEING INSTALLED SHOULD ALSO HELP CATCH THESE ANOMALIES BEFORE THE RWY IS TAKEN.

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.