Narrative:

After pushing from the gate; I called for taxi clearance and was told our clearance had dropped out of the system. As a result the captain made the decision to shut down the number one engine to conserve fuel while coordinating with dispatch to refile and waiting to receive the new clearance from ground. After receiving the new clearance I completed a delayed engine start per the operating manual (OM); and we taxied to the runway for takeoff. During the takeoff roll; around 80 KIAS the captain; who was pm; stated that the engines were not putting out symmetric thrust. I could not notice the difference in the feel of the aircraft; and stated such; so we continued the takeoff. After calling for the after takeoff checklist the captain told me that the engines both went to normal climb thrust when the thrust levers were put into the climb thrust detent.after discussing the issue; the captain and myself both agreed that the issue was that we forgot to input the flex thrust value from the weight and balance after completing the delayed engine start; after the number one engine had already been started and shut down prior to the delayed engine start. I did not recognize the difference in the thrust carrots while completing the before takeoff check below the line and the captain did not initially notice the difference in thrust when stating thrust set during the takeoff roll. While shutting an engine down after starting both is not unusual; it is not very common. Since we already completed the after start and performance checklists; and there was no change requiring the completion of another performance check; we did not complete an additional performance check after completing the delayed engine start. Additionally; while we did not feel rushed; we were significantly delayed due to maintenance and a scheduled aircraft swap. I missed the difference in thrust carrots during the before takeoff check. Slow down and be vigilant when completing checklists. The company could bring this scenario to the attention of pilots.

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Original NASA ASRS Text

Title: CRJ-700 flight crew described the circumstances leading to a takeoff with one engine programed for takeoff thrust and the other set to flex thrust. The number one engine is started then shut down due to an ATC delay. When the engine is restarted the flex thrust temperature setting is not reentered.

Narrative: After pushing from the gate; I called for taxi clearance and was told our clearance had dropped out of the system. As a result the captain made the decision to shut down the number one engine to conserve fuel while coordinating with dispatch to refile and waiting to receive the new clearance from ground. After receiving the new clearance I completed a delayed engine start per the Operating Manual (OM); and we taxied to the runway for takeoff. During the takeoff roll; around 80 KIAS the captain; who was PM; stated that the engines were not putting out symmetric thrust. I could not notice the difference in the feel of the aircraft; and stated such; so we continued the takeoff. After calling for the after takeoff checklist the captain told me that the engines both went to normal climb thrust when the thrust levers were put into the climb thrust detent.After discussing the issue; the captain and myself both agreed that the issue was that we forgot to input the flex thrust value from the weight and balance after completing the delayed engine start; after the number one engine had already been started and shut down prior to the delayed engine start. I did not recognize the difference in the thrust carrots while completing the before takeoff check below the line and the captain did not initially notice the difference in thrust when stating thrust set during the takeoff roll. While shutting an engine down after starting both is not unusual; it is not very common. Since we already completed the after start and performance checklists; and there was no change requiring the completion of another performance check; we did not complete an additional performance check after completing the delayed engine start. Additionally; while we did not feel rushed; we were significantly delayed due to maintenance and a scheduled aircraft swap. I missed the difference in thrust carrots during the before takeoff check. Slow down and be vigilant when completing checklists. The company could bring this scenario to the attention of pilots.

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.