A B737's takeoff was rejected when the takeoff warning horn sounded at 100 KTS. Maintenance determin...

Attributes
ACN	898616
Time
Date	201007
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Component
Aircraft Component	Safety Instrumentation & Information
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 108 Flight Crew Type 20000
Person 2
Function	Pilot Not Flying First Officer
Experience	Flight Crew Last 90 Days 139 Flight Crew Type 3000
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

We were taking off with a weight of 130.2; V1 of 112 KTS. The takeoff roll was normal until 100 KTS. The takeoff warning horn sounded. We were unsure if the aircraft was safe to fly. The decision had to be made immediately; and we chose to abort; as again; we unsure if the aircraft was safe to fly. The abort was normal. We exited at the end; ran the checklist and QRH; which indicated a twenty-five minute cooling off period. We taxied to the gate; called maintenance; and replaced the fseu (flaps/slat electronic unit) box. The next takeoff was uneventful. Evidently; this malfunction has occurred numerous times previously; although I had not heard of it before this incident. This fseu problem information needs to be incorporated into the fom; or this information needs to be disseminated to the pilots via a bulletin. But; when you get a takeoff warning above 80 KTS and before V1; are we to assume it is just a harmless malfunction; or the flaps or slats have actually split; or blown up; or what? A takeoff warning could mean the aircraft is unsafe to fly. In the alternative; I would suggest adjusting the parameters of the fseu to a level; which would not create these warnings unless there is a significant problem.

Original NASA ASRS Text

Title: A B737's takeoff was rejected when the takeoff warning horn sounded at 100 KTS. Maintenance determined that Flap/Slat Electronic Unit issued a false warning.

Narrative: We were taking off with a weight of 130.2; V1 of 112 KTS. The takeoff roll was normal until 100 KTS. The takeoff warning horn sounded. We were unsure if the aircraft was safe to fly. The decision had to be made immediately; and we chose to abort; as again; we unsure if the aircraft was safe to fly. The abort was normal. We exited at the end; ran the checklist and QRH; which indicated a twenty-five minute cooling off period. We taxied to the gate; called Maintenance; and replaced the FSEU (Flaps/Slat Electronic Unit) box. The next takeoff was uneventful. Evidently; this malfunction has occurred numerous times previously; although I had not heard of it before this incident. This FSEU problem information needs to be incorporated into the FOM; or this information needs to be disseminated to the pilots via a bulletin. But; when you get a takeoff warning above 80 KTS and before V1; are we to assume it is just a harmless malfunction; or the flaps or slats have actually split; or blown up; or what? A takeoff warning could mean the aircraft is unsafe to fly. In the alternative; I would suggest adjusting the parameters of the FSEU to a level; which would not create these warnings unless there is a significant problem.

Data retrieved from NASA's ASRS site as of April 2012 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.

A B737's takeoff was rejected when the takeoff warning horn sounded at 100 KTS. Maintenance determined that flap/slat electronic unit issued a false warning.