Narrative:

During ground operations the first officer set up the FMS and the crew briefed a runway xxl departure in accordance with the current ATIS. At push; a new ATIS came out changing the departing runway to xy. As the first officer started the engines the captain requested new takeoff data. After engine start; the first officer loaded the new performance data and crew briefed the taxi plan and departure changes. Due to light traffic and short taxi; both engines were started prior to taxi. ATC taxi clearance was 'taxi to runway xy via X'. I do not recall ATC mentioning taxiway X1 intersection during either taxi or takeoff clearance. Before takeoff checklist was accomplished during taxi and was complete prior to arriving at runway xy/X1. Both crew members verified 'runway xy' and took-off normally and without incident with over 3;000 ft. Remaining at liftoff. Takeoff data used was for full length and not for X1 intersection where takeoff was initiated. The company pages mention runway xy at X1 departures. I did not 'read to understand' the full text during preflight study as we were planning on departing from runway xx. When reviewing the new taxi flow after engine start; I had the diagram blown up with runway xy on the bottom of the screen. This essentially blocked the view of taxiway Y on the opposite side of the runway which is where you go for full length takeoff. This led me to assume we were doing full length; because taxiway X1 is the furthest to the end of the runway on the terminal side.it was a unique taxiway configuration. Rarely do you have to cross a runway to get to a full length. It was dark. Taxiway Y on the other side of the runway was not obvious and the displaced threshold was mistaken for under run. I was expecting to be at the end of the runway. The taxi and takeoff clearance did not mention or allude to an intersection takeoff.it was a late runway change. Although all checklists were accomplished; I failed to literally zoom-out and see the big picture. I did not feel fatigued however; I had a 01:00 am wake-up. This is not my peak performance time of the day.

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Original NASA ASRS Text

Title: A320 Captain reported confusion and loss of situational awareness resulted in an inadvertent intersection takeoff.

Narrative: During ground operations the First Officer set up the FMS and the crew briefed a Runway XXL departure in accordance with the current ATIS. At push; a new ATIS came out changing the departing Runway to XY. As the First Officer started the engines the Captain requested new takeoff data. After engine start; the First Officer loaded the new performance data and crew briefed the taxi plan and departure changes. Due to light traffic and short taxi; both engines were started prior to taxi. ATC taxi clearance was 'taxi to Runway XY via X'. I do not recall ATC mentioning taxiway X1 intersection during either taxi or takeoff clearance. Before takeoff checklist was accomplished during taxi and was complete prior to arriving at Runway XY/X1. Both crew members verified 'Runway XY' and took-off normally and without incident with over 3;000 ft. remaining at liftoff. Takeoff data used was for full length and not for X1 intersection where takeoff was initiated. The company pages mention Runway XY at X1 departures. I did not 'read to understand' the full text during preflight study as we were planning on departing from Runway XX. When reviewing the new taxi flow after engine start; I had the diagram blown up with Runway XY on the bottom of the screen. This essentially blocked the view of Taxiway Y on the opposite side of the runway which is where you go for full length takeoff. This led me to assume we were doing full length; because Taxiway X1 is the furthest to the end of the runway on the terminal side.It was a unique taxiway configuration. Rarely do you have to cross a runway to get to a full length. It was dark. Taxiway Y on the other side of the runway was not obvious and the displaced threshold was mistaken for under run. I was expecting to be at the end of the runway. The taxi and takeoff clearance did not mention or allude to an intersection takeoff.It was a late runway change. Although all checklists were accomplished; I failed to literally zoom-out and see the big picture. I did not feel fatigued however; I had a 01:00 AM wake-up. This is not my peak performance time of the day.

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.