What are the two systems used to determine the amount of fuel on board an aircraft?

The correct answer highlights the importance of the two distinct methods commonly used for gauging fuel levels in aircraft: remote fuel sensors and visual indications.

Remote fuel sensors are electronic devices that accurately measure the fuel level in the tanks and relay this information to the cockpit displays. These sensors can provide real-time data about fuel levels and often integrate with modern aircraft systems for advanced monitoring.

Visual indications refer to the physical observation through clear sight tubes or calibrated marks on the fuel tanks that allow pilots to visually assess the amount of fuel present. This method provides a simple and direct way to verify fuel load, particularly useful in situations where electronic systems may not be functional.

Together, these two systems ensure that fuel status is continuously monitored, providing pilots critical data for safe flight operations. Understanding both methods enhances situational awareness, which is vital for effective cockpit management during all phases of flight.