Narrative:

On takeoff roll at approximately 130 knots; aircraft abruptly pulled to the left twice in rapid succession causing an alarmed expression from the first officer (first officer) (pilot flying). I noticed the nose track abruptly left twice; but without my hands on the controls did not notice any jolt. After climbing to a low workload flight condition; the first officer indicated that he felt a jolt to the left twice like nothing he had felt before in a boeing. I then remembered that on the previous leg I had a similar jolt to the left; at about 130 knots [on departure]. I had noted this to the first officer at the time; but attributed it to wake turbulence. But thinking back; the only aircraft in the pattern was an air force T-1. We established a patch to dispatch and discussed the situation with [dispatch] and maintenance. We made a collective decision to divert to have maintenance check over the aircraft.

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Original NASA ASRS Text

Title: A B737-700 flight crew reported they noticed an abnormal 'shimmy' on the takeoff roll that might have been nosewheel steering related. They diverted to an alternate for maintenance.

Narrative: On takeoff roll at approximately 130 knots; aircraft abruptly pulled to the left twice in rapid succession causing an alarmed expression from the First Officer (FO) (Pilot Flying). I noticed the nose track abruptly left twice; but without my hands on the controls did not notice any jolt. After climbing to a low workload flight condition; the FO indicated that he felt a jolt to the left twice like nothing he had felt before in a Boeing. I then remembered that on the previous leg I had a similar jolt to the left; at about 130 knots [on departure]. I had noted this to the FO at the time; but attributed it to wake turbulence. But thinking back; the only aircraft in the pattern was an Air Force T-1. We established a patch to Dispatch and discussed the situation with [Dispatch] and Maintenance. We made a collective decision to divert to have Maintenance check over the aircraft.

Data retrieved from NASA's ASRS site 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.