Narrative:

We taxied to runway 30 in iad. All checklist and procedures were called for and accomplished normally. We were given a takeoff clearance as we were taking the runway. I transferred controls to the first officer and he immediately noticed the number one engine was not running. We canceled our takeoff clearance and cleared the runway. The engine start/stop selector was in the stop position. I determined that in the absence of an EICAS message; the engine had not spontaneously shut down and could be safely restarted. Having accomplished this; we were instructed to taxi to the runway and a normal flight was conducted.complacency; after many hundreds of takeoff cycles; it sometimes becomes so routine that vigilance can suffer. Also; the day prior; I had worked a 1435 hour duty day with multiple deadheads and a short overnight; so fatigue can not be ruled out as contributory.

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Original NASA ASRS Text

Title: An air carrier crew realized after taking the runway that only one engine had been started and so exited the runway to start the engine before completing a normal takeoff.

Narrative: We taxied to Runway 30 in IAD. All checklist and procedures were called for and accomplished normally. We were given a takeoff clearance as we were taking the runway. I transferred controls to the First Officer and he immediately noticed the number one engine was not running. We canceled our takeoff clearance and cleared the runway. The engine start/stop selector was in the stop position. I determined that in the absence of an EICAS message; the engine had not spontaneously shut down and could be safely restarted. Having accomplished this; we were instructed to taxi to the runway and a normal flight was conducted.Complacency; after many hundreds of takeoff cycles; it sometimes becomes so routine that vigilance can suffer. Also; the day prior; I had worked a 1435 hour duty day with multiple deadheads and a short overnight; so fatigue can not be ruled out as contributory.

Data retrieved from NASA's ASRS site as of July 2013 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.