Which steps verify an abnormal fuel quantity indication in flight?

• A. Request priority landing only
• B. Increase fuel flow to compensate
• C. Cross-check with other indicators, validate with the fuel schedule, and consider gauge or wiring faults and tank isolation
• D. Initiate immediate engine shutdown

Answer: (C)

When a fuel quantity indication appears abnormal, the best approach is to verify it through redundancy and a careful check of the system. Start by cross-checking the reading against other indicators in the airplane’s fuel system—use standby or alternate fuel gauges, and look at the fuel balance or totalizer displays that show each tank’s quantity. This helps determine if the anomaly is isolated to one gauge or sensor.

Then compare what you see with the fuel schedule or planned fuel on board and the expected consumption for the remaining flight. If the indicated quantity aligns with the schedule and other indicators, the abnormal reading may be a sensor fault rather than a real fuel problem. If there’s a discrepancy, it points to a possible gauge or wiring fault or an issue with tank isolation valves, so you should inspect those areas and use any available backup indications.

This method avoids acting on a potentially faulty signal and ensures you have a valid picture of the actual fuel state before making decisions, which is critical for safe flight.