Narrative:

Clear VFR day. Light cargo load of 1;573 lbs. Weight of aircraft at takeoff was 29.2. On taxi out ground control told us the current wind state and offered us runway 21 instead of runway 3. The PIC told me to accept the offer of taking off on runway 21. On takeoff roll; after I called 'V1; rotate'; there was a single chime and a master caution light. An associated EFIS comp light appeared. The PIC called abort and applied max braking at about the 7;000 feet remaining board. I called tower and announced we were aborting the takeoff. The PIC pulled off the runway at A5. I informed the PIC that I called 'V1; rotate' and he acknowledged that he heard me but chose to abort anyway. At that time we had a 'wheels' caution light on the cap with an associated 'hot' brakes caution light. The EFIS light was extinguished by this time. I called ground and explained the reason for our abort and didn't request any further help. I got taxi clearance to taxi back to runway 21 and hold short. I first ran the after landing checklist; then the QRH for the EFIS comp; then the hot brakes QRH. The EFIS comp light was believed to be associated with the heading by the PIC. I had no other caution lights on my eadi (electronic attitude director indicator) when the EFIS light appeared. Ground suggested that we use the customs ramp to sit and wait for the brakes to cool per the QRH. After about two other aircraft took off the light was out and we proceeded to takeoff again with no more events. After landing I informed the company mechanic of the event.

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Original NASA ASRS Text

Title: Captain of an ATR42 reported needing to reject the take off just after V1.

Narrative: Clear VFR day. Light cargo load of 1;573 lbs. Weight of aircraft at takeoff was 29.2. On taxi out Ground Control told us the current wind state and offered us Runway 21 instead of Runway 3. The PIC told me to accept the offer of taking off on Runway 21. On takeoff roll; after I called 'V1; rotate'; there was a single chime and a master caution light. An associated EFIS COMP light appeared. The PIC called abort and applied max braking at about the 7;000 feet remaining board. I called tower and announced we were aborting the takeoff. The PIC pulled off the runway at A5. I informed the PIC that I called 'V1; rotate' and he acknowledged that he heard me but chose to abort anyway. At that time we had a 'wheels' caution light on the CAP with an associated 'HOT' brakes caution light. The EFIS light was extinguished by this time. I called ground and explained the reason for our abort and didn't request any further help. I got taxi clearance to taxi back to Runway 21 and hold short. I first ran the after landing checklist; then the QRH for the EFIS COMP; then the HOT brakes QRH. The EFIS COMP light was believed to be associated with the heading by the PIC. I had no other caution lights on my EADI (Electronic Attitude Director Indicator) when the EFIS light appeared. Ground suggested that we use the customs ramp to sit and wait for the brakes to cool per the QRH. After about two other aircraft took off the light was out and we proceeded to takeoff again with no more events. After landing I informed the company mechanic of the event.

Data retrieved from NASA's ASRS site 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.