Narrative:

We were holding the position on the runway for takeoff. When cleared, I started pushing the throttles forward and the takeoff warning horn sounded. I only had attained taxi speed, so we requested to taxi clear of the runway. Once clear, we checked that the flaps and leading edge devices were all extended, speed brake stowed and the horizontal stabilizer set for takeoff. Everything was verified in its proper setting. Next, I cycled the speed brake handle. Then I pushed up #3 throttle and again got the takeoff warning horn. The first officer then moved the stabilizer trim from 5.8 units to 5.0 units and back to 5.8. This time the takeoff warning horn did not sound when I advanced #3 throttle. I assumed it was a stuck switch or relay that had been released by actuating the stabilizer trim. We were already delayed 1 hour by ATC for traffic congestion at our destination hub, and our passenger would miss their last connecting flts for the night if I delayed any further. I decided to return for takeoff instead of returning to the gate for further investigation by maintenance. Although the takeoff and flight were uneventful, my decision was wrong. I should have turned and let maintenance confirm the airworthiness of the aircraft. That will be my future procedure.

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Original NASA ASRS Text

Title: ACR LGT HAS TKOF WARNING HORN SOUND AS THROTTLES ARE ADVANCED. CREW ABORTS TKOF, RESETS TRIM AND DEPARTS AGAIN WITHOUT PROBLEM. COMPANY POLICY DICTATED A RETURN TO GATE FOR MAINTENANCE INSPECTION.

Narrative: WE WERE HOLDING THE POS ON THE RWY FOR TKOF. WHEN CLRED, I STARTED PUSHING THE THROTTLES FORWARD AND THE TKOF WARNING HORN SOUNDED. I ONLY HAD ATTAINED TAXI SPD, SO WE REQUESTED TO TAXI CLR OF THE RWY. ONCE CLR, WE CHKED THAT THE FLAPS AND LEADING EDGE DEVICES WERE ALL EXTENDED, SPD BRAKE STOWED AND THE HORIZ STAB SET FOR TKOF. EVERYTHING WAS VERIFIED IN ITS PROPER SETTING. NEXT, I CYCLED THE SPD BRAKE HANDLE. THEN I PUSHED UP #3 THROTTLE AND AGAIN GOT THE TKOF WARNING HORN. THE F/O THEN MOVED THE STABILIZER TRIM FROM 5.8 UNITS TO 5.0 UNITS AND BACK TO 5.8. THIS TIME THE TKOF WARNING HORN DID NOT SOUND WHEN I ADVANCED #3 THROTTLE. I ASSUMED IT WAS A STUCK SWITCH OR RELAY THAT HAD BEEN RELEASED BY ACTUATING THE STABILIZER TRIM. WE WERE ALREADY DELAYED 1 HR BY ATC FOR TFC CONGESTION AT OUR DEST HUB, AND OUR PAX WOULD MISS THEIR LAST CONNECTING FLTS FOR THE NIGHT IF I DELAYED ANY FURTHER. I DECIDED TO RETURN FOR TKOF INSTEAD OF RETURNING TO THE GATE FOR FURTHER INVESTIGATION BY MAINT. ALTHOUGH THE TKOF AND FLT WERE UNEVENTFUL, MY DECISION WAS WRONG. I SHOULD HAVE TURNED AND LET MAINT CONFIRM THE AIRWORTHINESS OF THE ACFT. THAT WILL BE MY FUTURE PROC.

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.