<< >> NASA ASRS Report 1251284, March 2015

B737 flight crew reported they rejected the takeoff at den at about 80kts when the takeoff warning horn sounded. No cause for the warning was found.

Attributes
ACN	1251284
Time
Date	201503
Local Time Of Day	1801-2400
Place
Locale Reference	DEN.Airport
State Reference	CO
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Flight Phase	Takeoff
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Person 2
Function	Pilot Not Flying Captain
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

Reject occurred on runway 25 den. During the before takeoff check the takeoff config switch was checked and did not sound. At around 80-85 knots the takeoff config horn sounded. The captain rejected and we exited the runway uneventfully. We advised den tower that we wanted time to run checklist and would advise. We ran the checklist and consulted brake cooling chart and found everything to be normal and none of the items that would cause the horn to sound were evident. We requested flaps 5 data and returned to the runway and took off without any further issues.

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Original NASA ASRS Text

Title: B737 flight crew reported they rejected the takeoff at DEN at about 80kts when the takeoff warning horn sounded. No cause for the warning was found.

Narrative: Reject occurred on Runway 25 DEN. During the before takeoff check the Takeoff config switch was checked and did not sound. At around 80-85 knots the Takeoff Config horn sounded. The Captain rejected and we exited the runway uneventfully. We advised DEN Tower that we wanted time to run checklist and would advise. We ran the checklist and consulted brake cooling chart and found everything to be normal and none of the items that would cause the horn to sound were evident. We requested flaps 5 data and returned to the runway and took off without any further issues.

Data retrieved from NASA's ASRS site 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.