Medium large transport stops accelerating at 80 KTS resulting in aborted takeoff. Reporter suspect u...

Attributes
ACN	447979
Time
Date	199909
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : act.airport
State Reference	TX
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Weather Elements	Windshear Thunderstorm
Light	Daylight
Aircraft 1
Controlling Facilities	tower : act.tower
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : charter
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 15000 flight time type : 6000
ASRS Report	447979
Person 2
Affiliation	company : charter
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Events
Anomaly	ground encounters other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : rejected takeoff
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance Environmental Factor Aircraft ATC Human Performance Weather
Primary Problem	Weather

Narrative:

Aircraft seemed to accelerate normally. At approximately 3000 ft down the runway, the aircraft stopped accelerating around 80 KIAS. At approximately 4000 ft with only 2500 ft or less remaining, the aircraft was only indicating 90 KTS. At that point I elected to abort, since our V1 speed was 155 KTS. We checked our numbers, and took off on opposite runway without further incident. We suspect undetected windshear, winds were reported as 'light and variable,' thunderstorms in area. Suggest windshear data be checked.

Original NASA ASRS Text

Title: MLG STOPS ACCELERATING AT 80 KTS RESULTING IN ABORTED TKOF. RPTR SUSPECT UNRPTED WINDSHEAR.

Narrative: ACFT SEEMED TO ACCELERATE NORMALLY. AT APPROX 3000 FT DOWN THE RWY, THE ACFT STOPPED ACCELERATING AROUND 80 KIAS. AT APPROX 4000 FT WITH ONLY 2500 FT OR LESS REMAINING, THE ACFT WAS ONLY INDICATING 90 KTS. AT THAT POINT I ELECTED TO ABORT, SINCE OUR V1 SPD WAS 155 KTS. WE CHKED OUR NUMBERS, AND TOOK OFF ON OPPOSITE RWY WITHOUT FURTHER INCIDENT. WE SUSPECT UNDETECTED WINDSHEAR, WINDS WERE RPTED AS 'LIGHT AND VARIABLE,' TSTMS IN AREA. SUGGEST WINDSHEAR DATA BE CHKED.

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.

Medium large transport stops accelerating at 80 KTS resulting in aborted takeoff. Reporter suspect unrpted windshear.