B737-700 crew reported a swerve on takeoff roll at dfw was due to a crosswind gust or jet blast.

Attributes
ACN	585405
Time
Date	200306
Day	Thu
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	agl bound lower : 0 agl bound upper : 33000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dfw.tower
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude climbout : takeoff cruise : level ground : takeoff roll
Route In Use	departure sid : n/s
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	585405
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	other anomaly other spatial deviation
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : landed in emergency condition flight crew : regained aircraft control other
Consequence	other other
Supplementary
Problem Areas	Environmental Factor Weather
Primary Problem	Environmental Factor

Narrative:

Uncommanded swerve on takeoff. On the takeoff roll around 100 KTS the aircraft swerved slightly right. The side load placed on the tires made a sound that sounded like a possible tire failure. A scan of all engine instruments indicated they were normal. As the aircraft straightened up and continued down the runway all indications and sounds returned to normal. A normal takeoff and climb to cruise altitude followed. Once at cruise altitude a review of the aircraft logbook revealed a write-up from days before that the tread on the right main gear tire was low and required inspection. This was signed off as within limits. Taking these two together, I concluded it would be a good idea to have dispatch contact dfw and request they inspect the runway for possible tire FOD. I also requested that arff meet the aircraft upon landing at our destination. After landing we stopped the aircraft on the runway while arff personnel inspected the tires. No damage was found and we taxied to the gate. A post flight inspection did not reveal any tire damage or other possible cause for the swerve. Conclusion, a crosswind gust or possible jet-blast caused the temporary swerve during takeoff.

Original NASA ASRS Text

Title: B737-700 CREW RPTED A SWERVE ON TKOF ROLL AT DFW WAS DUE TO A XWIND GUST OR JET BLAST.

Narrative: UNCOMMANDED SWERVE ON TKOF. ON THE TKOF ROLL AROUND 100 KTS THE ACFT SWERVED SLIGHTLY R. THE SIDE LOAD PLACED ON THE TIRES MADE A SOUND THAT SOUNDED LIKE A POSSIBLE TIRE FAILURE. A SCAN OF ALL ENG INSTRUMENTS INDICATED THEY WERE NORMAL. AS THE ACFT STRAIGHTENED UP AND CONTINUED DOWN THE RWY ALL INDICATIONS AND SOUNDS RETURNED TO NORMAL. A NORMAL TKOF AND CLB TO CRUISE ALT FOLLOWED. ONCE AT CRUISE ALT A REVIEW OF THE ACFT LOGBOOK REVEALED A WRITE-UP FROM DAYS BEFORE THAT THE TREAD ON THE R MAIN GEAR TIRE WAS LOW AND REQUIRED INSPECTION. THIS WAS SIGNED OFF AS WITHIN LIMITS. TAKING THESE TWO TOGETHER, I CONCLUDED IT WOULD BE A GOOD IDEA TO HAVE DISPATCH CONTACT DFW AND REQUEST THEY INSPECT THE RWY FOR POSSIBLE TIRE FOD. I ALSO REQUESTED THAT ARFF MEET THE ACFT UPON LNDG AT OUR DEST. AFTER LNDG WE STOPPED THE ACFT ON THE RWY WHILE ARFF PERSONNEL INSPECTED THE TIRES. NO DAMAGE WAS FOUND AND WE TAXIED TO THE GATE. A POST FLT INSPECTION DID NOT REVEAL ANY TIRE DAMAGE OR OTHER POSSIBLE CAUSE FOR THE SWERVE. CONCLUSION, A XWIND GUST OR POSSIBLE JET-BLAST CAUSED THE TEMPORARY SWERVE DURING 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.