With 80 gallons of usable AvGas and 20 gallons for preflight operations, what is the maximum cruise flight time allowed?

To determine the maximum cruise flight time allowed with the given fuel scenario, it's essential to start by calculating the total amount of fuel available for flight after accounting for preflight operations. In this case, there are 80 gallons of usable AvGas, but 20 gallons are reserved for preflight operations, which must be subtracted from the total usable fuel.

This leaves us with 80 gallons - 20 gallons = 60 gallons of fuel available for cruise flight.

Next, you'll need to know the fuel consumption rate of the airplane in gallons per hour. This rate varies among different aircraft, but let's say it is a common value used for training purposes, such as 20 gallons per hour.

Now, divide the available fuel for cruise (60 gallons) by the consumption rate (20 gallons per hour):

60 gallons ÷ 20 gallons/hour = 3 hours.

If you were to convert this value into more detailed time, it might reflect something different based on a more precise consumption rate or additional factors like power settings, but if we assume the question implies a specific consumption rate that matches the answer, we focus on that basis.

If the fuel consumption is indeed lower, for instance, 15 gallons per hour, then:

60 gallons