Intermittent takeoff warning horn aborted twice.

Attributes
ACN	287086
Time
Date	199410
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lga airport : lg
State Reference	NY
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 21000 flight time type : 2400
ASRS Report	287086
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : rejected takeoff
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Warning horn during takeoff. We aborted. After clearing runway we checked the 6 items that can trip the takeoff warning. The only item that was suspicious was the flap gauge. The needle was in the takeoff range, but at the bottom of the arc. We cycled the flaps and the indicator needle was now centered. I then advanced the power levers to check the system and did not get a warning horn. I deducted that this event was a nuisance trip and decided to depart. (This is allowed by company procedures). On the second takeoff roll, the takeoff warning sounded again. The takeoff was aborted and I noted this time, the ground spoiler extend light was illuminated. My personal concern is that, on the second takeoff, when the horn sounded, my first thought was that it was the flap gauge, only an indication problem and would go away when reconfigured airborne. Fortunately, this impulse wasn't acted on, but the fact that it entered my mind is quite sobering.

Original NASA ASRS Text

Title: INTERMITTENT TKOF WARNING HORN ABORTED TWICE.

Narrative: WARNING HORN DURING TKOF. WE ABORTED. AFTER CLRING RWY WE CHKED THE 6 ITEMS THAT CAN TRIP THE TKOF WARNING. THE ONLY ITEM THAT WAS SUSPICIOUS WAS THE FLAP GAUGE. THE NEEDLE WAS IN THE TKOF RANGE, BUT AT THE BOTTOM OF THE ARC. WE CYCLED THE FLAPS AND THE INDICATOR NEEDLE WAS NOW CTRED. I THEN ADVANCED THE PWR LEVERS TO CHK THE SYS AND DID NOT GET A WARNING HORN. I DEDUCTED THAT THIS EVENT WAS A NUISANCE TRIP AND DECIDED TO DEPART. (THIS IS ALLOWED BY COMPANY PROCS). ON THE SECOND TKOF ROLL, THE TKOF WARNING SOUNDED AGAIN. THE TKOF WAS ABORTED AND I NOTED THIS TIME, THE GND SPOILER EXTEND LIGHT WAS ILLUMINATED. MY PERSONAL CONCERN IS THAT, ON THE SECOND TKOF, WHEN THE HORN SOUNDED, MY FIRST THOUGHT WAS THAT IT WAS THE FLAP GAUGE, ONLY AN INDICATION PROB AND WOULD GO AWAY WHEN RECONFIGURED AIRBORNE. FORTUNATELY, THIS IMPULSE WASN'T ACTED ON, BUT THE FACT THAT IT ENTERED MY MIND IS QUITE SOBERING.

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.