Warning horn sounds with power application at takeoff. Takeoff aborted.

Attributes
ACN	263824
Time
Date	199402
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : orf
State Reference	VA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : takeoff other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 12000 flight time type : 5000
ASRS Report	263824
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : rejected takeoff flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Pushed thrust levers forward for takeoff and got an immediate takeoff warning horn. Retarded the power, quality checked the cockpit and pushed forward on the speed brake lever. Aircraft was properly configured and speed brake lever was full forward and seated. Pushed power up and takeoff warning sounded again. I rejected the takeoff. This was a very low speed abort. We taxied clear of the runway and stopped the jet on the taxiway. Applicable checklists were performed. I jiggled the speed brake handle some more and then pushed a thrust lever forward. No takeoff warning horn sounded. I informed operations of the situation and taxied back for takeoff. No further problems. Once at cruise altitude, I made a more detailed inspection of the throttle quadrant. There was an excessive amount of dust/foreign object damage in the area of the speed brake lever/housing. I believe that this could have been our problem. Dirt and dust foreign object damage interfering with the confign microswitches. I had a similar problem 4-6 months ago. I notice that, on many of the aircraft, there is a lot of dust foreign object damage in this area.

Original NASA ASRS Text

Title: WARNING HORN SOUNDS WITH PWR APPLICATION AT TKOF. TKOF ABORTED.

Narrative: PUSHED THRUST LEVERS FORWARD FOR TKOF AND GOT AN IMMEDIATE TKOF WARNING HORN. RETARDED THE PWR, QUALITY CHKED THE COCKPIT AND PUSHED FORWARD ON THE SPD BRAKE LEVER. ACFT WAS PROPERLY CONFIGURED AND SPD BRAKE LEVER WAS FULL FORWARD AND SEATED. PUSHED PWR UP AND TKOF WARNING SOUNDED AGAIN. I REJECTED THE TKOF. THIS WAS A VERY LOW SPD ABORT. WE TAXIED CLR OF THE RWY AND STOPPED THE JET ON THE TXWY. APPLICABLE CHKLISTS WERE PERFORMED. I JIGGLED THE SPD BRAKE HANDLE SOME MORE AND THEN PUSHED A THRUST LEVER FORWARD. NO TKOF WARNING HORN SOUNDED. I INFORMED OPS OF THE SIT AND TAXIED BACK FOR TKOF. NO FURTHER PROBS. ONCE AT CRUISE ALT, I MADE A MORE DETAILED INSPECTION OF THE THROTTLE QUADRANT. THERE WAS AN EXCESSIVE AMOUNT OF DUST/FOREIGN OBJECT DAMAGE IN THE AREA OF THE SPD BRAKE LEVER/HOUSING. I BELIEVE THAT THIS COULD HAVE BEEN OUR PROB. DIRT AND DUST FOREIGN OBJECT DAMAGE INTERFERING WITH THE CONFIGN MICROSWITCHES. I HAD A SIMILAR PROB 4-6 MONTHS AGO. I NOTICE THAT, ON MANY OF THE ACFT, THERE IS A LOT OF DUST FOREIGN OBJECT DAMAGE IN THIS AREA.

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.