Narrative:

I as pilot flying rejected takeoff due to loss of directional control; aircraft yawed to the left. Thrust levers at 70% N1; speed less than 80 KTS; felt the rudders were dragged to the left. I pulled thrust levers to idle and maintained center line and taxied to the next taxiway. First officer as pilot monitoring contacted tower to abort takeoff and asked to stay on taxiway to finish the check list. There was no master warning or caution messages; every indications were as normal; configured to takeoff okay. The brake temperatures were normal at #3 green on all 4 tires; we waited for 15 minutes and retried again. I didn't call maintenance on this first attempt; misunderstood that I would call maintenance when arrived [at destination]; initial thought was it may be because of right thrust reverser inoperative deferred; or the tiller was not straight up; or the cross wind from the left; or operator error. The second take off was the same result; at 70% N1 and speed below 80 KTS. This time I called maintenance and taxied back to the gate. Maintenance found nose wheel bearings were tight; maintenance removed and replaced nose wheel assemblies. We did high speed taxi flight test twice; with maintenance supervision; the result was normal operation.misunderstood [that for a] rejected takeoff; even if the power was not at takeoff detent and/or all instruments were normal; still need to call maintenance.

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Original NASA ASRS Text

Title: CRJ-200 flight crew reported rejecting the takeoff twice in succession when they encountered directional control issues later found to be related to nose wheel bearings.

Narrative: I as pilot flying rejected takeoff due to loss of directional control; aircraft yawed to the left. Thrust levers at 70% N1; speed less than 80 KTS; felt the rudders were dragged to the left. I pulled thrust levers to idle and maintained center line and taxied to the next taxiway. First Officer as Pilot Monitoring contacted Tower to abort takeoff and asked to stay on taxiway to finish the check list. There was no master warning or caution messages; every indications were as normal; configured to takeoff okay. The brake temperatures were normal at #3 green on all 4 tires; we waited for 15 minutes and retried again. I didn't call maintenance on this first attempt; misunderstood that I would call maintenance when arrived [at destination]; initial thought was it may be because of right thrust reverser inoperative deferred; or the tiller was not straight up; or the cross wind from the left; or operator error. The second take off was the same result; at 70% N1 and speed below 80 KTS. This time I called maintenance and taxied back to the gate. Maintenance found nose wheel bearings were tight; maintenance removed and replaced nose wheel assemblies. We did high speed taxi flight test twice; with maintenance supervision; the result was normal operation.Misunderstood [that for a] rejected takeoff; even if the power was not at takeoff detent and/or all instruments were normal; still need to call maintenance.

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.