B737-300 crew had the aircraft yaw to the left during takeoff roll at stl.

Attributes
ACN	559994
Time
Date	200209
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : stl.airport
State Reference	MO
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ord.tower
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
Qualification	pilot : atp
Experience	flight time last 90 days : 63
ASRS Report	559994
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other other
Supplementary
Problem Areas	Aircraft Airport
Primary Problem	Ambiguous

Narrative:

Captain's takeoff. V1 was 128 KTS. At about 115 KTS, airplane abruptly swerved nose left for 1/2 seconds, which I immediately countered with right rudder. I felt no input on the rudder pedals during this yaw, and experienced no resistance on the rudder pedals as I corrected back to centerline. The airplane was completely controllable as I corrected. It seemed inappropriate to initiate a high speed rejected takeoff. Since this yaw was very brief, the aircraft experienced no further yaw problems for the remainder of the flight to den. We consulted dispatch and air carrier maintenance controller at cruise altitude, to discuss the problem and continued to a normal landing.

Original NASA ASRS Text

Title: B737-300 CREW HAD THE ACFT YAW TO THE L DURING TKOF ROLL AT STL.

Narrative: CAPT'S TKOF. V1 WAS 128 KTS. AT ABOUT 115 KTS, AIRPLANE ABRUPTLY SWERVED NOSE L FOR 1/2 SECONDS, WHICH I IMMEDIATELY COUNTERED WITH R RUDDER. I FELT NO INPUT ON THE RUDDER PEDALS DURING THIS YAW, AND EXPERIENCED NO RESISTANCE ON THE RUDDER PEDALS AS I CORRECTED BACK TO CTRLINE. THE AIRPLANE WAS COMPLETELY CONTROLLABLE AS I CORRECTED. IT SEEMED INAPPROPRIATE TO INITIATE A HIGH SPD REJECTED TKOF. SINCE THIS YAW WAS VERY BRIEF, THE ACFT EXPERIENCED NO FURTHER YAW PROBS FOR THE REMAINDER OF THE FLT TO DEN. WE CONSULTED DISPATCH AND ACR MAINT CTLR AT CRUISE ALT, TO DISCUSS THE PROB AND CONTINUED TO A NORMAL LNDG.

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.