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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.
| Attributes | |
| ACN | 1009593 |
| Time | |
| Date | 201205 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Electrical Power |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 14200 Flight Crew Type 4500 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
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.
Original NASA ASRS Text
Title: 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.
Narrative: 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.
Data retrieved from NASA's ASRS site as of July 2013 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.