<< >> NASA ASRS Report 1244258, March 2015

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.

Attributes
ACN	1244258
Time
Date	201503
Local Time Of Day	1201-1800
Place
Locale Reference	PHX.Airport
State Reference	AZ
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Component
Aircraft Component	Nosewheel Steering
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 222 Flight Crew Type 13000
Person 2
Function	Pilot Flying First Officer
Experience	Flight Crew Last 90 Days 166 Flight Crew Type 6000
Events
Anomaly	Aircraft Equipment Problem Less Severe

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.