Date: 201402
Local time of day: 1801-2400
Location: ZZZ.Airport, US
Flight conditions: VMC
Light: Dusk
Aircraft: Regional Jet 700 ER/LR (CRJ700)
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Other Rejected Takeoff
ATC / advisory: Tower ZZZ
Aircraft component: Aileron Trim System
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Confusion
Anomaly: Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Automation Aircraft Other Automation; Person Flight Crew
Result: Flight Crew Rejected Takeoff
Contributing factors: Aircraft; Human Factors
Primary problem: Aircraft

Narrative: We pushed out and got cleared to taxi down to the runway for departure. We ran all the checklists and noted everything was operating normally. We ran the Before TakeOff Check and noticed all three trims in the green. We were cleared to takeoff and the pilot flying (me) advanced the throttle to about 70% N2 and advanced it to full power. The takeoff was a full thrust bleeds open takeoff WITH wings and cowls on. As soon as the pilot flying went to the TOGA detent the aircraft had a Master Warning with config aileron trim. The Captain executed a low speed abort and got off Taxiway Echo. We noticed that the aileron trim had come out of the green range. We notified Tower and exited Taxiway Echo.  Conducted the Abort Checklist (Immediate action and QRH). No evacuation was necessary. We notified the passengers and stopped on the taxiway. We contacted the Dispatcher who put us on hold and transferred the Captain to a Mechanic. I remember the Captain specifically asking whether an AFDL entry had to be made.  However since the aileron system had cleared itself and no break temps went past the green; the Maintenance Controller said no entry was needed and a takeoff was okay without an AFDL entry. We ran the Before Takeoff Checklist and took off with no event. The rest of the flight was a non event with the exception of a passenger door out handle caution that came on and went off on the descent. That caution was deferred by Maintenance upon arriving. However when we notified Maintenance of the issue the Maintenance personnel told us that an AFDL entry should have been made for the abort. They told us to write it up as a low speed abort. However since the abort happened at another airport; Maintenance said we had flown with an open write up. We understood the Maintenance Controller to have told us to take off if the CONFIGURATION warning had disappeared; and the trims were back in the green.  On the next leg of the flight; after landing at the destination and in flight; we both noticed the aileron trim jumped out of the green range on the ground and auto trimmed itself in flight with no pilot input. We noticed it a few times when the aircraft was on the ground at the destination of the next leg. I wanted to include this because I was 100% sure seeing the trims in the green range when I verified the Before Takeoff Checklist; and am positive the trims changed without pilot input.  The flight inbound to ZZZ was late and consequently our flight was delayed. We had time pressure on us to get out of ZZZ. The conditions did not constitute anti icing or de-icing even though it was light snow flurries. The Captain expressed concerns of wanting to leave before the conditions deteriorate. We should have both realized that the abort constituted a write up and should have returned to the gate for one; instead of trusting the Maintenance Controller on the phone. Should have trusted my gut feeling; because I asked the Captain whether we need to write it up. And the Captain specifically asked the Maintenance Controller and he said no. Always write up any discrepancy of any sort; minor or major.  Don't let time pressure dictate otherwise; always take a deep breath and slow down.




Synopsis: CRJ-700 First Officer experiences a takeoff warning horn for aileron trim and the Captain rejects at low speed. The aileron trim was found out of the green although it had been checked prior to taking the runway. Maintenance Control is contacted and the crew is told that no logbook entry is necessary.