Crj-900 rejected takeoff due to abnormal landing gear shimmy and sounds.

Attributes
ACN	843864
Time
Date	200907
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Regional Jet 900 (CRJ900)
Operating Under FAR Part	Part 121
Flight Phase	Other Rejected Takeoff
Flight Plan	IFR
Component
Aircraft Component	Wheel Assemblies
Person 1
Function	Captain Pilot Not Flying
Experience	Flight Crew Last 90 Days 22 Flight Crew Total 9000 Flight Crew Type 800
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

During takeoff roll aircraft was making a loud shimmy noise and vibration with a grinding component to the sound and airspeed did not seem to be increasing normally. I thought that I had a problem with the gear or the tires that seem to be preventing the aircraft from accelerating normally. I called abort at or above about 120 KTS and deployed thrust reverser's and like braking due to the large amount of runway remaining. Completed checklists returned to gate.

Original NASA ASRS Text

Title: CRJ-900 rejected takeoff due to abnormal landing gear shimmy and sounds.

Narrative: During takeoff roll aircraft was making a loud shimmy noise and vibration with a grinding component to the sound and airspeed did not seem to be increasing normally. I thought that I had a problem with the gear or the tires that seem to be preventing the aircraft from accelerating normally. I called abort at or above about 120 KTS and deployed thrust reverser's and like braking due to the large amount of runway remaining. Completed checklists returned to gate.

Data retrieved from NASA's ASRS site as of April 2012 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.