CRJ-700 flight crew reported receiving caution messages upon entering the runway and rejected the takeoff. The flight crew then returned to the gate for maintenance action.
Synopsis
CRJ-700 flight crew reported receiving caution messages upon entering the runway and rejected the takeoff. The flight crew then returned to the gate for maintenance action.
Narrative
We taxied onto the Runway XXL at ZZZ. When we entered the runway the Takeoff Config OK message was illuminated. As we were cleared for takeoff; I advanced the throttles to takeoff power. Not long after advancing the throttles we heard a triple chime. I looked down to see the red warning message of Config Rudder." We switched controls and aborted the takeoff. We only accelerated to about 40 kt. before aborting. I notified Tower that we were aborting on the runway for a trim warning light. We exited left on Taxiway XX. We set the brake and ran through the QRH; we didn't find any applicable QRH procedures. We communicated with the flight attendants and the passengers. We taxied back to the gate. We notified Maintenance. The rudder was deflected at some point after taking the runway due to a loose rudder trim knob.A loose rudder trim knob allowed the trim to deflect itself due to the movement of the aircraft. Maintenance showed us how to verify that the rudder trim knob was functioning correctly. We could avoid a recurrence of this type of event in the future by paying closer attention to knobs and switches to identify a malfunctioning knob sooner."
Second reporter narrative
The flight was from ZZZ - ZZZ1. We departed Gate XX for Runway XXL. The taxi was normal up until the takeoff. Upon entering Runway XXL at the XY intersection; the Takeoff Config OK message was illuminated. In addition; we received an EFIS COMP MON caution message. We followed the SOPM (Standard Overhaul Practices Manual) procedure and the message extinguished. We advanced the thrust levers to TOGA thrust without issue. At approximately 40 - 50 kt. we received a CONFIG RUDDER master warning message. I called abort and took over the flight controls. The FO (First Officer) notified ATC. I only cracked" the thrust reversers as we were below 60 kt. already. I applied gentle braking and we came to a stop swiftly and exited Runway XXL at Taxiway XX.Once the parking brake was set; we realized the rudder trim was deflected full right. Upon later discovery it was due to a faulty loose knob. There weren't any applicable memory items/QRH/QRH procedures for this item. We did not deem it necessary to declare an emergency with ATC. We communicated with the flight attendants and passengers we would be returning to the gate. I called Maintenance and informed them. Operations had us return to Gate XY. We taxied to the gate without issue and once at the gate notified Dispatch; as well as the applicable company personnel. The knob was fixed and we continued the flight without issue. The cause of this event was a loose rudder trim knob that shifted due to the movement of the aircraft. We had completed a flight in the aircraft previously without issue. Speaking to maintenance personnel; we were instructed how to verify the rudder trim knob is installed correctly. I think the best way to avoid a repeat of this event is diligence in checking how the trim knobs are installed."
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.