Narrative:

On the last leg of a 5-leg day the flight started normally. The captain and I followed all checklists. We taxied to runway 32L/T10 as assigned by ord ground. Approaching the runway (I believe we were number 3 or 4); the captain called for the before takeoff check to the line. I performed my checklist flow and we read the checklist. Both of us visually verified that we had the green 'takeoff config O/K' message; and completed the before take-off checklist to the line. Ord tower cleared us to line up and wait on runway 32L/T10. We both verified the runway (the captain verbally); ensured the runway was clear and taxied into position. While we were doing this; the captain called for the before takeoff check below the line. I performed my flow and read the checklist. When in position; the captain transferred controls to me and I accepted them; then we both verbally verified that the runway heading was correct. The tower cleared us to takeoff on runway 32L/T10 with a right turn to 040 heading (I believe). The wind was something like 270 at 9 (or possibly 280. I'm not sure of the speed; but I'm pretty sure it was below 14 KTS as we didn't have much wind at all that day). I added some left aileron to correct for the crosswind. I advanced the power to within 2% of takeoff N1 and called for the captain to 'set thrust.' the captain adjusted the thrust to the correct setting and said; 'thrust set.' we accelerated down the runway. I maintained the centerline and adjusted the wind correction as necessary. The captain was scanning the instruments. At 80 KTS the captain called; '80 KTS.' I verified the speed and said; 'check.' at some point after that; but before we got to V1; I reached down and added some left aileron trim. Immediately; we received a 'takeoff config aileron trim' warning message (I believe that's the wording). The captain called for the abort and took the controls. I gave him the controls and then called tower to let them know that we aborted our takeoff. I had to call them three times because I kept stepping on other people. However; I did finally get through to them. They told us to exit the runway when able. They then canceled the takeoff clearance of the aircraft behind us; which I believe had not started its takeoff roll yet. We taxied clear of the runway onto taxiway T between H and west and stopped to assess the situation. At that point; I told him that I had adjusted the aileron trim; and that it caused the warning message. The captain notified maintenance and verified that they needed to check out the airplane. I got a gate and called ground to return to a new gate. Ground again asked if we needed assistance; and I told them we did not. They asked; for their paperwork; the reason for the abort. I told them; 'we received an aileron trim warning message.' at the gate; the captain wrote up the rejected takeoff. Maintenance arrived and the captain explained the situation.

Google
 

Original NASA ASRS Text

Title: CRJ200 First Officer reports adjusting the aileron trim during the takeoff roll which immediately causes a 'Takeoff Config Aileron Trim' warning message. The Captain assumes control and rejects the takeoff.

Narrative: On the last leg of a 5-leg day the flight started normally. The Captain and I followed all checklists. We taxied to Runway 32L/T10 as assigned by ORD Ground. Approaching the runway (I believe we were number 3 or 4); the Captain called for the before takeoff check to the line. I performed my checklist flow and we read the checklist. Both of us visually verified that we had the green 'Takeoff Config O/K' message; and completed the Before Take-off checklist to the line. ORD Tower cleared us to line up and wait on Runway 32L/T10. We both verified the runway (the Captain verbally); ensured the runway was clear and taxied into position. While we were doing this; the Captain called for the Before Takeoff check below the line. I performed my flow and read the checklist. When in position; the Captain transferred controls to me and I accepted them; then we both verbally verified that the runway heading was correct. The Tower cleared us to takeoff on Runway 32L/T10 with a right turn to 040 heading (I believe). The wind was something like 270 at 9 (or possibly 280. I'm not sure of the speed; but I'm pretty sure it was below 14 KTS as we didn't have much wind at all that day). I added some left aileron to correct for the crosswind. I advanced the power to within 2% of takeoff N1 and called for the Captain to 'Set Thrust.' The Captain adjusted the thrust to the correct setting and said; 'Thrust Set.' We accelerated down the runway. I maintained the centerline and adjusted the wind correction as necessary. The Captain was scanning the instruments. At 80 KTS the Captain called; '80 KTS.' I verified the speed and said; 'Check.' At some point after that; but before we got to V1; I reached down and added some left aileron trim. Immediately; we received a 'Takeoff Config Aileron Trim' warning message (I believe that's the wording). The Captain called for the abort and took the controls. I gave him the controls and then called Tower to let them know that we aborted our takeoff. I had to call them three times because I kept stepping on other people. However; I did finally get through to them. They told us to exit the runway when able. They then canceled the takeoff clearance of the aircraft behind us; which I believe had not started its takeoff roll yet. We taxied clear of the runway onto Taxiway T between H and W and stopped to assess the situation. At that point; I told him that I had adjusted the aileron trim; and that it caused the warning message. The Captain notified Maintenance and verified that they needed to check out the airplane. I got a gate and called ground to return to a new gate. Ground again asked if we needed assistance; and I told them we did not. They asked; for their paperwork; the reason for the abort. I told them; 'We received an Aileron Trim warning message.' At the gate; the Captain wrote up the rejected takeoff. Maintenance arrived and the Captain explained the situation.

Data retrieved from NASA's ASRS site as of July 2013 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.