B737-800 flight crew experienced an aural takeoff configuration warning horn at approximately 100 kn...

Attributes
ACN	1461330
Time
Date	201706
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Component
Aircraft Component	Flight Dynamics
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

On takeoff; power was advanced to approximately 40% N1; engines stabilized with normal engine indications. Takeoff thrust was set. First officer made '80 knots' callout. At approximately 100 knots; the takeoff warning horn sounded and the takeoff configuration light illuminated. I initiated a rejected takeoff. Tower was notified. Aircraft was safely taxied off of the active runway. Arff was requested to assist -- thermal inspection accomplished. Arff vehicles accompanied us back to the gate. Flap configuration was 1 per the tps. Flaps were set prior to taxi and not changed. Flap lever fully seated in selected detent. Speed brake lever fully in down position. Appropriate trim setting in green takeoff range.

Original NASA ASRS Text

Title: B737-800 flight crew experienced an aural takeoff configuration warning horn at approximately 100 knots during attempted takeoff; which was aborted.

Narrative: On takeoff; power was advanced to approximately 40% N1; engines stabilized with normal engine indications. Takeoff thrust was set. FO made '80 Knots' callout. At approximately 100 knots; the Takeoff Warning horn sounded and the TAKEOFF CONFIG light illuminated. I initiated a Rejected Takeoff. Tower was notified. Aircraft was safely taxied off of the active runway. ARFF was requested to assist -- thermal inspection accomplished. ARFF vehicles accompanied us back to the gate. Flap configuration was 1 per the TPS. Flaps were set prior to taxi and not changed. Flap lever fully seated in selected detent. Speed Brake lever fully in down position. Appropriate trim setting in Green Takeoff range.

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.