What is the unusable fuel amount from the total capacity of the fuel system?

The unusable fuel amount in an aircraft is the portion of the fuel that is not accessible or can’t be used during flight, even if it is present in the tanks. In the case of the Beechcraft Travel Air BE-95, the correct unusable fuel amount is 106 gallons.

This specific amount is derived from the design and engineering specifications of the fuel system, which allows for an operational reserve in fuel tanks, ensuring that there is always a margin that cannot be utilized. Such a specification is crucial for safe operation, as it helps to prevent fuel starvation and maintain engine performance by ensuring fuel is maintained at a level that can be drawn during normal operations.

Determining the unusable fuel correctly is essential for flight planning and weight and balance calculations, impacting how far the aircraft can fly while maintaining safety. Accurate knowledge of this value allows pilots and flight planners to account for fuel consumption more effectively and ensure compliance with regulatory requirements regarding minimum fuel reserves. The other choices do not reflect the actual unusable amount as outlined in the aircraft’s specifications, making them incorrect for this context.