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B777 captain experiences a dual idg failure 25 minutes after takeoff. With the APU supplying the electrical system fuel is dumped and the flight returns to the departure airport. Maintenance determines that contaminated fluid was the cause of both failures.
| Attributes | |
| ACN | 1189212 |
| Time | |
| Date | 201407 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| 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 | Generator Drive |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Approximately 25 minutes after takeoff; right generator went offline. While running checklist and prior to complying with checklist-directed disconnection of the right idg; the left generator also went offline. The 2 generator failures occurred within minutes of each other. Continued to work ecl for right generator failure; and disconnected right idg. Left and right sides of electrical system load was then assumed by the APU. An initial reset on the left generator was successful. It only lasted maybe a minute. Left generator drive shortly disconnected on its own. After collaboration with dispatch; decision was made to declare an emergency and return. Had to dump fuel. A normal landing was made. Maintenance later informed me that both drives had contaminated fluid.
Original NASA ASRS Text
Title: B777 Captain experiences a dual IDG failure 25 minutes after takeoff. With the APU supplying the electrical system fuel is dumped and the flight returns to the departure airport. Maintenance determines that contaminated fluid was the cause of both failures.
Narrative: Approximately 25 minutes after takeoff; R generator went offline. While running checklist and prior to complying with checklist-directed disconnection of the R IDG; the L generator also went offline. The 2 generator failures occurred within minutes of each other. Continued to work ECL for R generator failure; and disconnected R IDG. L and R sides of electrical system load was then assumed by the APU. An initial reset on the L generator was successful. It only lasted maybe a minute. L generator drive shortly disconnected on its own. After collaboration with Dispatch; decision was made to declare an emergency and return. Had to dump fuel. A normal landing was made. Maintenance later informed me that both drives had contaminated fluid.
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.