B737 crew experienced multiple takeoff warning horns at 95 KTS on takeoff roll at sna.

Attributes
ACN	523217
Time
Date	200108
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sna.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 112 flight time total : 18000 flight time type : 900
ASRS Report	523217
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	maintenance problem : improper maintenance non adherence : company policies non adherence : far non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : tkof warning horn other flight crewa other flight crewb
Resolutory Action	flight crew : rejected takeoff none taken : detected after the fact other
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : testing performance deficiency : repair performance deficiency : non compliance with legal requirements performance deficiency : installation performance deficiency : inspection performance deficiency : fault isolation
Supplementary
Problem Areas	Aircraft Maintenance Human Performance Company
Primary Problem	Aircraft

Narrative:

1) flaps 15 degrees takeoff. Power advanced normally, acceleration normal. Takeoff warning horn at 90-95 KTS. Rejected takeoff, ran checklists, taxied to gate. Maintenance ran computer checks per maintenance manual and could find nothing wrong. Reboarded for takeoff #2. 2) ran power up to 75% to see if horn would sound. All cockpit indications normal just like first takeoff attempt. Started takeoff roll, and warning horn sounded at 80-85 KTS. Rejected again, returned to gate and turned aircraft over to maintenance. After first reject maintenance told me the aircraft had no history of this type of event. After second reject, maintenance at ZZZ told me a similar event occurred on aug/tue/01 and they replaced switch 130 in the flap system. After reject #2 this switch was adjusted and a subsequent takeoff with no revenue passenger onboard was accomplished successfully.

Original NASA ASRS Text

Title: B737 CREW EXPERIENCED MULTIPLE TKOF WARNING HORNS AT 95 KTS ON TKOF ROLL AT SNA.

Narrative: 1) FLAPS 15 DEGS TKOF. PWR ADVANCED NORMALLY, ACCELERATION NORMAL. TKOF WARNING HORN AT 90-95 KTS. REJECTED TKOF, RAN CHKLISTS, TAXIED TO GATE. MAINT RAN COMPUTER CHKS PER MAINT MANUAL AND COULD FIND NOTHING WRONG. REBOARDED FOR TKOF #2. 2) RAN PWR UP TO 75% TO SEE IF HORN WOULD SOUND. ALL COCKPIT INDICATIONS NORMAL JUST LIKE FIRST TKOF ATTEMPT. STARTED TKOF ROLL, AND WARNING HORN SOUNDED AT 80-85 KTS. REJECTED AGAIN, RETURNED TO GATE AND TURNED ACFT OVER TO MAINT. AFTER FIRST REJECT MAINT TOLD ME THE ACFT HAD NO HISTORY OF THIS TYPE OF EVENT. AFTER SECOND REJECT, MAINT AT ZZZ TOLD ME A SIMILAR EVENT OCCURRED ON AUG/TUE/01 AND THEY REPLACED SWITCH 130 IN THE FLAP SYS. AFTER REJECT #2 THIS SWITCH WAS ADJUSTED AND A SUBSEQUENT TKOF WITH NO REVENUE PAX ONBOARD WAS ACCOMPLISHED SUCCESSFULLY.

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.