Narrative:

On above date flight attempted to takeoff from dfw. Takeoff was normal until 110 KTS indicated when the takeoff warning horn came on the takeoff was rejected and a cause for the alarm was searched for. Everything was in the proper takeoff confign. The brake limits were checked and a 14 min waiting period was adhered to. While waiting we thought that maybe the flaps had blown up from the 5 degree setting thus causing the alarm to go off. We cycled the flaps from 5-15 degrees, then back to 5 degrees. After the time had elapsed for the brake limits, we took off again with flaps at 5 degrees and a gross weight of 98500 pounds. Takeoff was normal and this incident did not recur for the rest of the time we flew the aircraft. Callback conversation with reporter revealed the following: confirmed reporter was PIC and model of aircraft. This model medium large transport has the takeoff warning horn set to sound if the trailing edge flaps are not to at least the 5 degree extended position when throttles advanced to takeoff power. Suspects the actuating cylinders maybe slightly worn and flaps were just not quite far enough down to actuate the switch. FAA has investigated the incident due to similarity to accident last year at dfw.

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Original NASA ASRS Text

Title: ACR MLG GETS TKOF WARNING HORN ON TKOF ROLL AT DFW AND ABORTS TKOF, APPARENTLY DUE TO FLAP WARNING SYSTEM PROBLEM.

Narrative: ON ABOVE DATE FLT ATTEMPTED TO TKOF FROM DFW. TKOF WAS NORMAL UNTIL 110 KTS INDICATED WHEN THE TKOF WARNING HORN CAME ON THE TKOF WAS REJECTED AND A CAUSE FOR THE ALARM WAS SEARCHED FOR. EVERYTHING WAS IN THE PROPER TKOF CONFIGN. THE BRAKE LIMITS WERE CHKED AND A 14 MIN WAITING PERIOD WAS ADHERED TO. WHILE WAITING WE THOUGHT THAT MAYBE THE FLAPS HAD BLOWN UP FROM THE 5 DEG SETTING THUS CAUSING THE ALARM TO GO OFF. WE CYCLED THE FLAPS FROM 5-15 DEGS, THEN BACK TO 5 DEGS. AFTER THE TIME HAD ELAPSED FOR THE BRAKE LIMITS, WE TOOK OFF AGAIN WITH FLAPS AT 5 DEGS AND A GROSS WT OF 98500 LBS. TKOF WAS NORMAL AND THIS INCIDENT DID NOT RECUR FOR THE REST OF THE TIME WE FLEW THE ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: CONFIRMED RPTR WAS PIC AND MODEL OF ACFT. THIS MODEL MLG HAS THE TKOF WARNING HORN SET TO SOUND IF THE TRAILING EDGE FLAPS ARE NOT TO AT LEAST THE 5 DEG EXTENDED POS WHEN THROTTLES ADVANCED TO TKOF PWR. SUSPECTS THE ACTUATING CYLINDERS MAYBE SLIGHTLY WORN AND FLAPS WERE JUST NOT QUITE FAR ENOUGH DOWN TO ACTUATE THE SWITCH. FAA HAS INVESTIGATED THE INCIDENT DUE TO SIMILARITY TO ACCIDENT LAST YEAR AT DFW.

Data retrieved from NASA's ASRS site as of August 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.