B737-900
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 200; Flight Crew Type 8504
Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Became Reoriented
Human Factors
On takeoff while rolling down runway at 100 knots; FO said he needed to reset flaps to 5. As I hesitated to process the information since we were in the high speed regime; the FO reset the flaps to 5 from flaps 1. We accelerated to takeoff speed in plenty of time as the flaps tracked to the correct setting. Plenty of runway left as we rotated at normal speed.
B737 Captain reported during the takeoff roll the First Officer reset the flaps from flaps 1 to flaps 5 and they continued the takeoff.