LR60 captain reports rejected takeoff at 120 knots for takeoff warning horn.

Attributes
ACN	795015
Time
Date	200807
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : oak.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	general aviation : corporate
Make Model Name	Learjet 60
Operating Under FAR Part	Part 91
Flight Phase	ground : takeoff roll
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	795015
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : tkof warning
Resolutory Action	flight crew : rejected takeoff
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Takeoff warning horn sounded at between 110-120 KTS and immediate abort was called and executed; and ATC was notified of aborted takeoff. No takeoff setting anomalies were noted or indicated other than the warning horn. Since no anomalies or confign faults were found; the cause is unknown. Possibilities may have been a spoiler that became partially deployed or the parking brake sensor detected a fault.

Original NASA ASRS Text

Title: LR60 CAPT REPORTS REJECTED TKOF AT 120 KNOTS FOR TKOF WARNING HORN.

Narrative: TKOF WARNING HORN SOUNDED AT BTWN 110-120 KTS AND IMMEDIATE ABORT WAS CALLED AND EXECUTED; AND ATC WAS NOTIFIED OF ABORTED TKOF. NO TKOF SETTING ANOMALIES WERE NOTED OR INDICATED OTHER THAN THE WARNING HORN. SINCE NO ANOMALIES OR CONFIGN FAULTS WERE FOUND; THE CAUSE IS UNKNOWN. POSSIBILITIES MAY HAVE BEEN A SPOILER THAT BECAME PARTIALLY DEPLOYED OR THE PARKING BRAKE SENSOR DETECTED A FAULT.

Data retrieved from NASA's ASRS site as of May 2009 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.