For a pressure altitude of sea level, with a temperature of 80 degrees F and a weight of 3,000 lb, what is the required ground roll for takeoff over a 50-foot obstacle?

To determine the required ground roll for takeoff over a 50-foot obstacle at sea level with a temperature of 80 degrees Fahrenheit and a weight of 3,000 lbs, we need to consider several factors, including aircraft performance data and the effects of density altitude on takeoff distances.

At sea level, the air density is at its highest, which contributes to better engine performance and greater lift. However, the temperature of 80 degrees F, though not extremely high, does affect density and, therefore, performance, leading to a longer takeoff roll compared to standard conditions (which would be 59 degrees F at sea level).

When considering the 50-foot obstacle, regulations and performance charts suggest that additional distance must be accounted for, meaning the actual takeoff distance will exceed the basic ground roll required to leave the ground.

The answer of 800 feet is likely derived from taking into account the aircraft's specific performance characteristics in the provided conditions. This performance figure considers the weight of the aircraft, temperature effects on lift and thrust, and how they influence the takeoff distance over an obstacle.

Therefore, the required ground roll for takeoff over a 50-foot obstacle is set at 800 feet, taking into account the realistic adjustments for