Takeoff aborted when takeoff warning horn sounds.

Attributes
ACN	239547
Time
Date	199304
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mdw
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : takeoff other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 190 flight time total : 20200 flight time type : 14000
ASRS Report	239547
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : overcame equipment problem flight crew : rejected takeoff other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Flight was cleared for takeoff on runway 22L at mdw. Taxiing onto the runway the throttles were advanced for a rolling taxi off. When 1.4 EPR (power check) was reached the takeoff warning horn sounded. The airplane was slowly rolling down the runway, throttles were retarded and the flaps, stabilizer trim and speed brake were confirmed in the takeoff confign. The tower was informed we were exiting the runway. They asked if we had a problem. We responded that we were checking a warning horn. The flaps, stabilizer trim and speed brake were again verified to be in the takeoff confign. The tower asked if we would be returning to the ramp or taxiing back for takeoff. We replied that we would taxi back for takeoff. Cleared for takeoff, the throttles were advanced to 1.4 EPR. The takeoff warning horn did not sound. Takeoff was made and flight completed without incident.

Original NASA ASRS Text

Title: TKOF ABORTED WHEN TKOF WARNING HORN SOUNDS.

Narrative: FLT WAS CLRED FOR TKOF ON RWY 22L AT MDW. TAXIING ONTO THE RWY THE THROTTLES WERE ADVANCED FOR A ROLLING TAXI OFF. WHEN 1.4 EPR (PWR CHK) WAS REACHED THE TKOF WARNING HORN SOUNDED. THE AIRPLANE WAS SLOWLY ROLLING DOWN THE RWY, THROTTLES WERE RETARDED AND THE FLAPS, STABILIZER TRIM AND SPD BRAKE WERE CONFIRMED IN THE TKOF CONFIGN. THE TWR WAS INFORMED WE WERE EXITING THE RWY. THEY ASKED IF WE HAD A PROB. WE RESPONDED THAT WE WERE CHKING A WARNING HORN. THE FLAPS, STABILIZER TRIM AND SPD BRAKE WERE AGAIN VERIFIED TO BE IN THE TKOF CONFIGN. THE TWR ASKED IF WE WOULD BE RETURNING TO THE RAMP OR TAXIING BACK FOR TKOF. WE REPLIED THAT WE WOULD TAXI BACK FOR TKOF. CLRED FOR TKOF, THE THROTTLES WERE ADVANCED TO 1.4 EPR. THE TKOF WARNING HORN DID NOT SOUND. TKOF WAS MADE AND FLT COMPLETED WITHOUT INCIDENT.

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.