FAA Private Pilot Test Prep

Correct answer: D. 545 feet. First look at the pressure altitude which is the 5000 foot level in this example. Then read the changes in calculations. The temperature is 60 degree above the standard air temperature of 41 degrees. In that case, you need to only add 10% to the length of the roll which is another 49.5 feet, rounded up equals a final length of 545 feet.