Air carrier medium large transport flight crew aborts takeoff when aural takeoff warning horn sounds...

Attributes
ACN	148793
Time
Date	199006
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : pit
State Reference	PA
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	Medium Large Transport, Low Wing, 2 Turbojet Eng
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 : 180 flight time total : 8200 flight time type : 180
ASRS Report	148293
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe
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:

Flight in 6/90, runway 28R at pit. Performed all checklists (before start, after start, before takeoff). When cleared into position, we were cleared for takeoff. Upon advancing both throttles to takeoff position as soon as throttle lever position reached takeoff warning position we received takeoff warning horn. Airspeed was not alive and power setting reached approximately 65%. We immediately closed throttles and notified tower we were rejecting the takeoff. After rolling approximately 1000' with minimum braking, we made the first high speed exiting to the right. We checked trim and flap position, we found all were in proper position (trim setting 4.3, flaps 5 degrees). We then repositioned speed brake lever and asked tower to clear taxiway behind us (parallel taxiway) and we set brakes and mode throttles to takeoff warning area and received no warning. We then advised tower we were ready for takeoff and what back in line for takeoff. Upon receiving takeoff clearance, takeoff roll was commenced with normal indications. I did not feel it necessary to go back to gate for maintenance check, as I felt the speed brake lever switch contact probably had not been made.

Original NASA ASRS Text

Title: ACR MLG FLT CREW ABORTS TKOF WHEN AURAL TKOF WARNING HORN SOUNDS. AFTER CHECKING ALL PARAMETERS IT WAS NOT POSSIBLE TO DUPLICATE WARNING.

Narrative: FLT IN 6/90, RWY 28R AT PIT. PERFORMED ALL CHKLISTS (BEFORE START, AFTER START, BEFORE TKOF). WHEN CLRED INTO POS, WE WERE CLRED FOR TKOF. UPON ADVANCING BOTH THROTTLES TO TKOF POS AS SOON AS THROTTLE LEVER POS REACHED TKOF WARNING POS WE RECEIVED TKOF WARNING HORN. AIRSPD WAS NOT ALIVE AND PWR SETTING REACHED APPROX 65%. WE IMMEDIATELY CLOSED THROTTLES AND NOTIFIED TWR WE WERE REJECTING THE TKOF. AFTER ROLLING APPROX 1000' WITH MINIMUM BRAKING, WE MADE THE FIRST HIGH SPD EXITING TO THE RIGHT. WE CHKED TRIM AND FLAP POS, WE FOUND ALL WERE IN PROPER POS (TRIM SETTING 4.3, FLAPS 5 DEGS). WE THEN REPOSITIONED SPD BRAKE LEVER AND ASKED TWR TO CLR TXWY BEHIND US (PARALLEL TXWY) AND WE SET BRAKES AND MODE THROTTLES TO TKOF WARNING AREA AND RECEIVED NO WARNING. WE THEN ADVISED TWR WE WERE READY FOR TKOF AND WHAT BACK IN LINE FOR TKOF. UPON RECEIVING TKOF CLRNC, TKOF ROLL WAS COMMENCED WITH NORMAL INDICATIONS. I DID NOT FEEL IT NECESSARY TO GO BACK TO GATE FOR MAINT CHK, AS I FELT THE SPD BRAKE LEVER SWITCH CONTACT PROBABLY HAD NOT BEEN MADE.

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.

Air carrier medium large transport flight crew aborts takeoff when aural takeoff warning horn sounds. After checking all parameters it was not possible to duplicate warning.