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A B777 captain reported returning to their international departure airport after losing both main generators in flight.
| Attributes | |
| ACN | 1340963 |
| Time | |
| Date | 201603 |
| Place | |
| Locale Reference | ZZZZ.Airport |
| State Reference | FO |
| Aircraft 1 | |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | AC Generation |
| Person 1 | |
| Function | Captain Relief Pilot |
| Experience | Flight Crew Total 12018 Flight Crew Type 7798 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
We were climbing out and I was sitting up front awaiting another pilot to return from using the lavatory before starting my break. Climbing through FL250; I noticed the left generator off and drive lights both on simultaneously. [The other pilot] and I performed the electronic checklist which included starting the APU and we both decided to continue towards [destination]. Leveling at FL320; I looked up and now saw the right generator off and drive lights on simultaneously. We performed the checklist and this time; with 2 main generators inoperative and their drives disconnected per the checklist; we elected to return to jettison fuel and return to [departure airport]. Jettison was performed and [we] landed without incident. No emergency was declared and no special handling was requested. Upon landing; the mechanics pulled up the electrical page in the maintenance log and found that the left generator oil level showed 'service' and the right generator oil level showed 'normal'. Further; the left generator filter showed 'blocked'. The right generator filter also showed 'blocked'.
Original NASA ASRS Text
Title: A B777 Captain reported returning to their international departure airport after losing both main generators in flight.
Narrative: We were climbing out and I was sitting up front awaiting another pilot to return from using the lavatory before starting my break. Climbing through FL250; I noticed the left generator OFF and DRIVE lights both on simultaneously. [The other pilot] and I performed the electronic checklist which included starting the APU and we both decided to continue towards [destination]. Leveling at FL320; I looked up and now saw the right generator OFF and DRIVE lights on simultaneously. We performed the checklist and this time; with 2 main generators inoperative and their drives disconnected per the checklist; we elected to return to jettison fuel and return to [departure airport]. Jettison was performed and [we] landed without incident. No emergency was declared and no special handling was requested. Upon landing; the mechanics pulled up the Electrical Page in the Maintenance Log and found that the left GENERATOR Oil level showed 'Service' and the right GENERATOR Oil level showed 'Normal'. Further; the Left GENERATOR Filter showed 'Blocked'. The Right GENERATOR Filter also showed 'Blocked'.
Data retrieved from NASA's ASRS site 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.