B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 140
Distraction; Situational Awareness
Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors
Aircraft was programmed for a flaps 1 takeoff on Runway 16R. Before Taxi Checklist was done and we were cleared to taxi to Runway 16R to hold short at Taxiway Mike for landing traffic. While holding short of 16R at Taxiway Mike; we ran the numbers for an intersection takeoff from Taxiway Mike. The First Officer populated the CDU for a flaps 5 takeoff and new V-Speeds. At that time we were interrupted by ATC as we were cleared to back taxi the runway. We requested to takeoff from Taxiway Mike.We did the Departure Plan Checklist. I verbalized and visually checked the new flap 5 setting in the CDU and also verbalized the flap indicator setting but did not visually check the flap setting and flap handle position was at the new flaps 5 setting. I didn't take possession of the [computer] from the First Officer as per standard procedure when reviewing the departure plan which probably would have trapped the error. The Captain must always have possession of the [computer] when reviewing any change in takeoff performance. We were both aware of the change in flap setting but for some reason assumed the flaps were repositioned. Every change must be visually checked and verified.
We were given intrusions to taxi to Runway 16R and hold short on Taxiway M. On the way out; I ran the numbers in the [computer] to see if we could do an intersection M takeoff. Numbers were good. At the intersection; I began to populate the CDU with the numbers from the [computer]. In the middle of doing so; we were instructed to back taxi on 16. I asked the Captain if he wanted full length or stay with intersection. He said an intersection departure would be fine. I told ATC of our intentions. During the distraction with talking to ATC and the Captain; I inadvertently did not set the flaps from position 1 to 5. We stopped; holding short of Runway 16 at intersection M; and ran the checklist. However; I held both the [computer] in one hand and the checklist in other and did not see that flaps were in an incorrect position. After takeoff; the Captain called to set speed/flaps 1. I said flaps were at 1. We retracted the remaining flaps on schedule. The rest of the flight was uneventful.
B737 flight crew reported taking off with the wrong flap setting because of distractions.