Regional Jet 200 ER/LR (CRJ200)
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Situational Awareness
Aircraft Equipment Problem Less Severe
Flight Crew Rejected Takeoff
Aircraft; Human Factors
We were doing a ferry flight. We pushed back and performed normal checklists under normal operations. We were given a line up and wait clearance on the runway. We had a TO (Takeoff) Config OK advisory message at this time. Tower instructed us 'Cleared for takeoff.' It was a windy day and the winds were coming from the right. We performed a normal thrust departure with Cont Ignition ON for takeoff. LLWS Advisories were in effect. I added right crosswind correction and set the thrust. When we accelerated to 100 KTS; Triple Chime Master Warning message appeared with Aural sound. Master warning message was TAKEOFF CONFIG with Aural sound 'Trim.' I performed the Rejected Takeoff because I briefed that in my takeoff briefing if we received any Red Master warnings prior to V1 which was 105 KTS for this flight.After discussing with the other pilot; we think the trim rolled back on its own and wasn't manually done after it was set. It could also have been a pilots thumb on the stab trim switch but no stab trim clacker sounded during any part of the taxi or takeoff roll.The only thing I could suggest is make sure to keep scanning the EICAS screens to be sure all instruments are reading correctly. This is difficult with it being in a high workload and the Pilot Flying focusing on the runway for takeoff. I would suggest it needs to be briefed that the Pilot Monitoring needs to scan this throughout the takeoff phase. Also; would be a good practice to make sure a pilots thumb isn't on the stab trim switch during takeoff roll.
[Report narrative contained no additional information]
CRJ-200 flight crew reported rejecting the takeoff when they received a 'Takeoff Config' alert message at 100 KTS for trim.