Narrative:

Flight departed the gate; taxied out to runway for departure. On the takeoff roll; the first officer watched the airspeed on pfd (primary flight display) climb normally to about 60 KTS; and then stagnate. After a couple of seconds; the airspeed indication appeared to return to normal; but then dropped 20 KTS. He called 'airspeed stagnation' at that time. The captain announced 'aborting;' and pulled the power levers to idle; applied the brakes and deployed the thrust reversers. Airspeed was likely around 80 KTS. Right about the time the abort was initiated; a 'mach trim' caution was displayed on ED1 (primary EICAS display). Brake temps were never out of the green range. The first officer noted brake temps never exceeded 05 on the btms (break temperature monitoring system). The first officer notified tower that we were aborting; and that no assistance was needed at this time. We cleared the runway; and verified with ground that we were okay to sit and run a few checklists. The first officer called the flight attendants and let them know we aborted for an instrumentation issue; all was normal from a safety standpoint and that we'd make a PA shortly. While the ca talked to the passengers; the first officer ran the aborted takeoff checklist; the mach trim caution checklist; and the after landing checklist. All checklists were completed without further issue. Dispatch was contacted by the captain; and maintenance was notified of the issue. The first officer called operations to get a gate to return to. The crew taxied to the new gate and no further incidents were encountered. The abort was made due to inconsistent airspeed indications between PFD1 and PFD2.

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Original NASA ASRS Text

Title: CRJ900 First Officer reports rejected takeoff when his airspeed indicator becomes erratic and he calls 'airspeed stagnation' causing the Captain to abort.

Narrative: Flight departed the gate; taxied out to runway for departure. On the takeoff roll; the First Officer watched the airspeed on PFD (Primary Flight Display) climb normally to about 60 KTS; and then stagnate. After a couple of seconds; the airspeed indication appeared to return to normal; but then dropped 20 KTS. He called 'Airspeed stagnation' at that time. The Captain announced 'Aborting;' and pulled the power levers to idle; applied the brakes and deployed the thrust reversers. Airspeed was likely around 80 KTS. Right about the time the abort was initiated; a 'MACH TRIM' Caution was displayed on ED1 (primary EICAS display). Brake temps were never out of the green range. The First Officer noted brake temps never exceeded 05 on the BTMS (Break Temperature Monitoring System). The First Officer notified Tower that we were aborting; and that no assistance was needed at this time. We cleared the runway; and verified with Ground that we were okay to sit and run a few checklists. The First Officer called the Flight Attendants and let them know we aborted for an instrumentation issue; all was normal from a safety standpoint and that we'd make a PA shortly. While the CA talked to the passengers; the First Officer ran the Aborted Takeoff checklist; the MACH TRIM Caution checklist; and the after landing checklist. All checklists were completed without further issue. Dispatch was contacted by the Captain; and Maintenance was notified of the issue. The First Officer called Operations to get a gate to return to. The crew taxied to the new gate and no further incidents were encountered. The abort was made due to inconsistent airspeed indications between PFD1 and PFD2.

Data retrieved from NASA's ASRS site as of April 2012 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.