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B737NG flight crew reported diverting to an alternate airport when they were unable to control fuel transfer from a wing tank into the center tank.
| Attributes | |
| ACN | 1569122 |
| Time | |
| Date | 201808 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Fuel System |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine |
| Experience | Flight Crew Type 704 |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Type 130 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Inflight Event / Encounter Fuel Issue |
Narrative:
We had the same aircraft for three legs on the same day. On the first leg we experienced problems with the center tank fuel pumps not functioning properly and then fuel transferring into the center tank once they were turned off. We notified maintenance of this and they said to check it again on the way to ZZZ. We experienced the same thing on that leg and wrote it up again. In ZZZ maintenance said to check it again on the way to ZZZ1. On the way to ZZZ1 it occurred again but this time so seriously that we were unable to control where the fuel was going. It was quickly getting out of balance and we were not able to control that so we diverted into ZZZ2.
Original NASA ASRS Text
Title: B737NG flight crew reported diverting to an alternate airport when they were unable to control fuel transfer from a wing tank into the center tank.
Narrative: We had the same aircraft for three legs on the same day. On the first leg we experienced problems with the center tank fuel pumps not functioning properly and then fuel transferring into the center tank once they were turned off. We notified Maintenance of this and they said to check it again on the way to ZZZ. We experienced the same thing on that leg and wrote it up again. In ZZZ Maintenance said to check it again on the way to ZZZ1. On the way to ZZZ1 it occurred again but this time so seriously that we were unable to control where the fuel was going. It was quickly getting out of balance and we were not able to control that so we diverted into ZZZ2.
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.