A B737-300 veered sharply left on takeoff at 95 KTS. The takeoff was rejected.

Attributes
ACN	757356
Time
Date	200710
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 200 flight time total : 9000 flight time type : 2000
ASRS Report	757356
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 200 flight time total : 5000 flight time type : 3000
ASRS Report	757350
Events
Anomaly	other anomaly
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : rejected takeoff
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

After the 80 KT thrust set call at approximately 95 KTS the aircraft abruptly turned 15 degrees to approximately 20 degrees to the left. At that time both the right rudder and right brake were applied to counter the drift and the takeoff was aborted. Then exited at taxiway 1 and held on taxiway 2 until crash crew arrived. I thought the left main tire had failed; but after visual from crash crew they said tire was fine so suspect that the brake had engaged to have the airplane shift left like it did so abruptly. We did have some crosswind correction with the right rudder and during the shift left of the airplane the rudders never moved; until I applied more right rudder to counter the left drift. We did the brake cooling chart before taxi to gate and deplane passenger. Callback conversation with reporter ace 757350 revealed the following information: the reporter stated that maintenance took the aircraft upon their return to the gate. Because another aircraft was available; the crew departed immediately without finding out what caused the problem.

Original NASA ASRS Text

Title: A B737-300 VEERED SHARPLY LEFT ON TKOF AT 95 KTS. THE TKOF WAS REJECTED.

Narrative: AFTER THE 80 KT THRUST SET CALL AT APPROX 95 KTS THE ACFT ABRUPTLY TURNED 15 DEGS TO APPROX 20 DEGS TO THE L. AT THAT TIME BOTH THE R RUDDER AND R BRAKE WERE APPLIED TO COUNTER THE DRIFT AND THE TKOF WAS ABORTED. THEN EXITED AT TXWY 1 AND HELD ON TXWY 2 UNTIL CRASH CREW ARRIVED. I THOUGHT THE L MAIN TIRE HAD FAILED; BUT AFTER VISUAL FROM CRASH CREW THEY SAID TIRE WAS FINE SO SUSPECT THAT THE BRAKE HAD ENGAGED TO HAVE THE AIRPLANE SHIFT L LIKE IT DID SO ABRUPTLY. WE DID HAVE SOME XWIND CORRECTION WITH THE R RUDDER AND DURING THE SHIFT L OF THE AIRPLANE THE RUDDERS NEVER MOVED; UNTIL I APPLIED MORE R RUDDER TO COUNTER THE L DRIFT. WE DID THE BRAKE COOLING CHART BEFORE TAXI TO GATE AND DEPLANE PAX. CALLBACK CONVERSATION WITH RPTR ACE 757350 REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT MAINT TOOK THE ACFT UPON THEIR RETURN TO THE GATE. BECAUSE ANOTHER ACFT WAS AVAILABLE; THE CREW DEPARTED IMMEDIATELY WITHOUT FINDING OUT WHAT CAUSED THE PROB.

Data retrieved from NASA's ASRS site as of January 2009 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.