Air carrier medium large transport takeoff abort when takeoff warning horn sounded at 90 KTS.

Attributes
ACN	170119
Time
Date	199101
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : iah
State Reference	TX
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
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 : first officer
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 180 flight time total : 6000
ASRS Report	170119
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : cfi pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 214 flight time total : 20751 flight time type : 14560
ASRS Report	169028
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : rejected takeoff flight crew : declared emergency
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

On 1/91 takeoff runway 14L iah to iad, the stabilizer trim takeoff warning sounded at approximately 90 ks. Stabilizer trim check was okay during taxi check and during initial throttle advance for takeoff. Takeoff roll was aborted and tower was advised. Taxied back to runway 14L runup area, reset all systems and performed stabilizer trim check. All checked ok. Departed iah west/O further incident. I believe problem was due to sensitivity of throttle position proximity switches that verify stabilizer trim is set properly as per the takeoff condition computer. This may have been avoided (the abort) by checking the stabilizer position with a throttle check more than once, at least twice so as to preclude a possible high speed abort if the warning sounded at some point during takeoff roll.

Original NASA ASRS Text

Title: ACR MLG TKOF ABORT WHEN TKOF WARNING HORN SOUNDED AT 90 KTS.

Narrative: ON 1/91 TKOF RWY 14L IAH TO IAD, THE STAB TRIM TKOF WARNING SOUNDED AT APPROX 90 KS. STAB TRIM CHK WAS OKAY DURING TAXI CHK AND DURING INITIAL THROTTLE ADVANCE FOR TKOF. TKOF ROLL WAS ABORTED AND TWR WAS ADVISED. TAXIED BACK TO RWY 14L RUNUP AREA, RESET ALL SYSTEMS AND PERFORMED STAB TRIM CHK. ALL CHKED OK. DEPARTED IAH W/O FURTHER INCIDENT. I BELIEVE PROB WAS DUE TO SENSITIVITY OF THROTTLE POS PROX SWITCHES THAT VERIFY STAB TRIM IS SET PROPERLY AS PER THE TKOF CONDITION COMPUTER. THIS MAY HAVE BEEN AVOIDED (THE ABORT) BY CHKING THE STAB POS WITH A THROTTLE CHK MORE THAN ONCE, AT LEAST TWICE SO AS TO PRECLUDE A POSSIBLE HIGH SPD ABORT IF THE WARNING SOUNDED AT SOME POINT DURING TKOF ROLL.

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.