Flight Crew Last 90 Days 200; Flight Crew Total 14200; Flight Crew Type 4500
Aircraft Equipment Problem Less Severe
Flight Crew Diverted; Flight Crew Overcame Equipment Problem; General Maintenance Action
Aircraft
During high speed regime of takeoff roll; approximately 110 KTS; right generator failed; right AC bus unpowered; right bus isolation illuminated. Continued takeoff; with right AC bus unpowered. During climb I determined that the problem seemed to be caused by the loss of the right generator; but that the highest priority checklist would be for the right AC bus off. Once reaching a safe altitude; Captain directed me to run the QRH for AC bus off; and restored power to right AC bus from right generator. In reading the right AC bus off checklist; we decided not to reset right bus tie since power was restored already; and bus isolated checklist does not suggest cycling bus tie switch; and in fact states not to turn it off if in flight. Captain contacted Dispatch and Maintenance; made decision to continue flight with right bus isolated; but to land at alternate airport with longer runways; as we would not be able to power right AC bus if right generator failed on landing; and would prefer not to have to deal with the associated items lost while trying to stop on a short runway. Flight landed at alternate airport without further incident.
B757-200 First Officer reports a right generator failure at 110 KTS during takeoff with the right AC bus remaining unpowered and isolated. Once safely airborne; the right generator is restored using the QRH to reset the generator; which restores power to the right AC bus. The crew elects not to cycle the bus tie switch to resume normal bus tie operation; but does elect to divert to an airport near the destination with a longer runway.