Why should pilots cross-check cockpit fuel quantity indicators against the FMS or planned trip fuel?

Why should pilots cross-check cockpit fuel quantity indicators against the FMS or planned trip fuel?

• A. To ensure accuracy due to possible calibration or sensor errors
• B. To calculate wing loading
• C. To satisfy MEL
• D. Because FMS requires it for autoland

Answer: (A)

Cross-checking fuel quantity readings with the FMS or planned trip fuel is about ensuring measurement reliability. Cockpit fuel gauges can be affected by calibration drift, sensor faults, or lag, which may give an inaccurate sense of how much fuel is truly on board. The FMS/planned trip fuel provides a calculated reference based on the route, expected burn, reserves, and taxi fuel. When you compare the actual gauge to this reference, you can spot discrepancies early, confirm you have enough fuel for the flight, and catch any sensor or gauge issues before departure. This is a safety check focused on accurate fuel state, not related to wing loading, MEL, or autoland requirements.

Cross-checking fuel quantity readings with the FMS or planned trip fuel is about ensuring measurement reliability. Cockpit fuel gauges can be affected by calibration drift, sensor faults, or lag, which may give an inaccurate sense of how much fuel is truly on board. The FMS/planned trip fuel provides a calculated reference based on the route, expected burn, reserves, and taxi fuel. When you compare the actual gauge to this reference, you can spot discrepancies early, confirm you have enough fuel for the flight, and catch any sensor or gauge issues before departure. This is a safety check focused on accurate fuel state, not related to wing loading, MEL, or autoland requirements.