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B777 flight crew reported discovering a rapidly decreasing fuel quantity indication at the first enroute checkpoint.
| Attributes | |
| ACN | 1579289 |
| Time | |
| Date | 201809 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Component | |
| Aircraft Component | Fuel Quantity-Pressure Indication |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 300 Flight Crew Total 15700 Flight Crew Type 3000 |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 133 Flight Crew Total 13300 Flight Crew Type 619 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Inflight Event / Encounter Fuel Issue |
Narrative:
At our first abeam [fuel] checkpoint approximately 1:00 hour into the flight; we noted the fuel score was off by minus 2;500 pounds. We checked progress page 2 on the FMC and monitored the totalizer vs. Calculated figures. The totalizer was decreasing at an abnormally high rate compared to normal. The disparity eventually reached a fuel score of minus 7;000 pounds. We accomplished the checklists; conferred with dispatch and maintenance control and determined the best course of action was to return to ZZZ. We determined we did not have a fuel leak from the main tanks and could safely continue to ZZZ but that an overweight landing would be the safest choice of action. Dumping fuel with an unreliable fuel quantity system seemed a bad option. ATC; ZZZ fire; dispatch; maintenance control and cabin crew were all advised and responded professionally. The landing was uneventful.
Original NASA ASRS Text
Title: B777 flight crew reported discovering a rapidly decreasing fuel quantity indication at the first enroute checkpoint.
Narrative: At our first abeam [fuel] checkpoint approximately 1:00 hour into the flight; we noted the fuel score was off by minus 2;500 pounds. We checked progress page 2 on the FMC and monitored the Totalizer vs. calculated figures. The Totalizer was decreasing at an abnormally high rate compared to normal. The disparity eventually reached a fuel score of minus 7;000 pounds. We accomplished the checklists; conferred with Dispatch and Maintenance Control and determined the best course of action was to return to ZZZ. We determined we did not have a fuel leak from the main tanks and could safely continue to ZZZ but that an overweight landing would be the safest choice of action. Dumping fuel with an unreliable fuel quantity system seemed a bad option. ATC; ZZZ Fire; Dispatch; Maintenance Control and Cabin Crew were all advised and responded professionally. The landing was uneventful.
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.