Why is it important to know fuel burn during preflight?

Knowing fuel burn during preflight is crucial for flight planning, as it directly relates to maximum endurance, which is the longest time an aircraft can fly with a given amount of fuel. By understanding the fuel consumption rates, pilots can calculate how long they can remain in the air before needing to refuel, which is particularly important for flights that may face unexpected delays or diversions.

For example, in scenarios where the flight may need to extend its duration due to weather, air traffic, or other factors, being aware of fuel burn enables the pilot to manage fuel reserves effectively and plan for safe landing options when fuel levels become critical.

This knowledge can also aid in ensuring compliance with regulatory requirements regarding minimum fuel reserves for specific flight operations. It provides pilots with the ability to make informed decisions about how to optimize flight profiles for greater efficiency.