Air carrier flight crew reported on final approach they were given clearance to land but soon after ATC instructed them to go around due to ground traffic crossing runways.
Synopsis
Air carrier flight crew reported on final approach they were given clearance to land but soon after ATC instructed them to go around due to ground traffic crossing runways.
Narrative
While on a visual approach to SFO 28L; SFO tower instructed us to go around. The aircraft was fully configured on a stable approach with the landing checklist complete and autopilot and auto throttle disengaged. The tower did not say what the reason for the go around was. There was traffic beginning their takeoff roll on the 1's. This is they only reason I could think of for the go around call.After ATC instructed the go around; I increased the throttles manually according to N1 display and pressed the TO/GA (Takeoff/Go Around) button on the throttle. During this time ATC began giving us multiple instructions which interrupted the go around flow. This was further compounded by the fact that I was advancing the throttles manually which took some time to set. The gear was inadvertently raised before the flaps. We noticed it when the gear horn sounded at which time the flaps were set to 15. ATC continued to give us instructions in the middle of the go around flow so the speed was not increased to clean maneuvering until well after 800AGL. The captain instructed me to lower the nose of the aircraft but the aircraft was at the bugged speed clear of the yellow band and pitch was matched to the flight director. I then called for level change set clean maneuver" and the flaps to be retraced on schedule. The captain also set the altitude and heading as instructed by ATC. We then were vectored around for another landing without incident.While the configuration changes happened out of order and late; the aircraft remained under positive control within aircraft limitations and ATC instructions."
Second reporter narrative
We were cleared to land runway 28L - on short final tower cleared an aircraft for takeoff on the cross runway and also cleared an aircraft to cross runway 28L as well. The FO and I mentioned that it was it was going to be tight; but it looked like they would be clear. Soon thereafter; Tower told us to go around and fly heading 160 and climb to an altitude of 3000 feet. I read back the clearance as I set the altitude and heading and said 'go around' - the FO did not respond; I then said 'going around; flaps 15; check thrust' to try to prompt him. I think I said check thrust again. He pushed the thrust forward and didn't say anything further but the thrust was in and we were climbing away from the ground. Tower called again and gave us a new climb out altitude of 3100 feet. I read this back to ATC and then I said 'positive rate; gear up; set missed approach altitude'; threw the gear up and selected heading mode (missed approach altitude was already set). The first officer asked for the auto throttles on and I turned them on; he then asked if we were in heading mode and I confirmed we were. At that point the horn went off because I had not raised the flaps to 15. The first officer said 'Flaps' and I raised the flaps to 15 and then the first officer commanded 'level change; set clean maneuvering speed; Flaps 5…' and we cleaned up and leveled off at 3100'. The rest of the pattern was uneventful and we made a safe landing back on 28L after getting vectored around again. First
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.