Narrative:

While departing ZZZ we were holding short of runway 22R at intersection west awaiting our take off clearance. Tower instructed us to line up and wait runway 22R at intersection west which I read back. I initiated my before takeoff flows and the captain asked for the before takeoff checklist which I verbally read and completed. The captain then taxied the aircraft across the hold short line onto 22R. While still taxiing into position tower gave us takeoff clearance for runway 22R intersection west which I acknowledged with a read back. Without bringing the aircraft to a stop the captain aligned us with the centerline and positively transferred the controls to me. After receiving control of the aircraft I stood up the thrust levers to 40% N1. While the engines were still spooling up to 40% the captain and I simultaneously observed a 737 on a taxiway further down the right side of 22R approaching the hold short line. The captain and I agreed that it was going to cross the hold short line onto the runway. I immediately brought the thrust levers to idle and applied the brakes bringing the aircraft to a stop. After the aircraft was stopped tower cancelled our take off clearance which we acknowledged with a read back. Without stopping at the hold short line the 737 crossed the runway from right to left. Once it was clear of the runway tower issued us a new take off clearance which was read back. The takeoff was then completed as normal. While I do not recall hearing the 737 receive clearance to cross the runway it may have been talking to a different controller; or it may have deviated from a clearance. It could have been a case of two aircraft receiving different clearances for the same runway at the same time. This incident highlights the importance of remaining vigilante at all times when near a runway; as well as monitoring the radio for other aircraft who may conflict with our own instructions.

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Original NASA ASRS Text

Title: Embraer 175 flight crew reported a rejected takeoff due to a runway incursion down field.

Narrative: While departing ZZZ we were holding short of Runway 22R at intersection W awaiting our take off clearance. Tower instructed us to line up and wait Runway 22R at intersection W which I read back. I initiated my before takeoff flows and the Captain asked for the before takeoff checklist which I verbally read and completed. The Captain then taxied the aircraft across the hold short line onto 22R. While still taxiing into position Tower gave us takeoff clearance for Runway 22R intersection W which I acknowledged with a read back. Without bringing the aircraft to a stop the Captain aligned us with the centerline and positively transferred the controls to me. After receiving control of the aircraft I stood up the thrust levers to 40% N1. While the engines were still spooling up to 40% the Captain and I simultaneously observed a 737 on a taxiway further down the right side of 22R approaching the hold short line. The Captain and I agreed that it was going to cross the hold short line onto the runway. I immediately brought the thrust levers to idle and applied the brakes bringing the aircraft to a stop. After the aircraft was stopped Tower cancelled our take off clearance which we acknowledged with a read back. Without stopping at the hold short line the 737 crossed the runway from right to left. Once it was clear of the runway Tower issued us a new take off clearance which was read back. The takeoff was then completed as normal. While I do not recall hearing the 737 receive clearance to cross the runway it may have been talking to a different controller; or it may have deviated from a clearance. It could have been a case of two aircraft receiving different clearances for the same runway at the same time. This incident highlights the importance of remaining vigilante at all times when near a runway; as well as monitoring the radio for other aircraft who may conflict with our own instructions.

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.