At yyz after report of windshear is given by tower, PIC of F100 elects to take off. Airspeed loss occurs. PIC 'firewalls' the throttles and flies out of the windshear.

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Attributes
ACN	356673
Time
Date	199612
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : yyz
State Reference	ON
Altitude	agl bound lower : 900 agl bound upper : 900
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : yyz
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : takeoff climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	356673
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	inflight encounter : weather inflight encounter other non adherence other other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : exited adverse environment flight crew : declared emergency flight crew : regained aircraft control
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation

Narrative:

ATC facility: yyz tower. Location: 1 NM north runway 6R. As we were cleared for takeoff on runway 6R we were informed previous aircraft encountered 20 KT loss at 500-1000 ft AGL on departure. Surface winds were southeast at about 5 KTS. We discussed the situation and decided to depart based on the light surface wind and relatively light load. Also figured this was an isolated encounter and unlikely to be encountered again. 'Wrong' assumption. I decided after rotation to build airspeed as rapidly as possible out of 500 ft just as a precaution. At about 700 ft AGL airspeed dropped from about 165 KTS to about 142 KTS -- a couple of KTS below flap retract speed, almost instantaneously. At the same time we received the 'windshear' warning and I immediately firewalled the throttles. Airspeed stabilized at about 141 KTS and I leveled off at about 900 ft until airspeed increased above flap retract speed, about 7 or 8 seconds. No loss of altitude occurred and shear reported to yyz departure. Next time I will consider opposite direction takeoff.

Original NASA ASRS Text

Title: AT YYZ AFTER RPT OF WINDSHEAR IS GIVEN BY TWR, PIC OF F100 ELECTS TO TAKE OFF. AIRSPD LOSS OCCURS. PIC 'FIREWALLS' THE THROTTLES AND FLIES OUT OF THE WINDSHEAR.

Narrative: ATC FACILITY: YYZ TWR. LOCATION: 1 NM N RWY 6R. AS WE WERE CLRED FOR TKOF ON RWY 6R WE WERE INFORMED PREVIOUS ACFT ENCOUNTERED 20 KT LOSS AT 500-1000 FT AGL ON DEP. SURFACE WINDS WERE SE AT ABOUT 5 KTS. WE DISCUSSED THE SIT AND DECIDED TO DEPART BASED ON THE LIGHT SURFACE WIND AND RELATIVELY LIGHT LOAD. ALSO FIGURED THIS WAS AN ISOLATED ENCOUNTER AND UNLIKELY TO BE ENCOUNTERED AGAIN. 'WRONG' ASSUMPTION. I DECIDED AFTER ROTATION TO BUILD AIRSPD AS RAPIDLY AS POSSIBLE OUT OF 500 FT JUST AS A PRECAUTION. AT ABOUT 700 FT AGL AIRSPD DROPPED FROM ABOUT 165 KTS TO ABOUT 142 KTS -- A COUPLE OF KTS BELOW FLAP RETRACT SPD, ALMOST INSTANTANEOUSLY. AT THE SAME TIME WE RECEIVED THE 'WINDSHEAR' WARNING AND I IMMEDIATELY FIREWALLED THE THROTTLES. AIRSPD STABILIZED AT ABOUT 141 KTS AND I LEVELED OFF AT ABOUT 900 FT UNTIL AIRSPD INCREASED ABOVE FLAP RETRACT SPD, ABOUT 7 OR 8 SECONDS. NO LOSS OF ALT OCCURRED AND SHEAR RPTED TO YYZ DEP. NEXT TIME I WILL CONSIDER OPPOSITE DIRECTION TKOF.

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.