Regional Jet CL65; Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Rejected Takeoff; Flight Crew Returned To Gate; General Maintenance Action
Aircraft
[We] rejected takeoff at 85 KTS because the Captain's altimeter setting spontaneously changed from 30.01 inches to 29.89 inches during the takeoff roll. I saw the displayed altitude change and the yellow NEG flag also popped up because the different altimeter setting placed us below sea level. Unknown what caused the malfunction.
CRJ-50 Captain reported rejecting takeoff at 85 KTS when his altimeter setting spontaneously changed from 30.01 to 29.89.