What is the required takeoff distance to clear a 50-foot obstacle at a temperature of 3°C and a pressure altitude of 6,000 feet with a weight of 3,000 pounds?

• A. 800 feet
• B. 1,100 feet
• C. 1,331 feet
• D. 1,250 feet

Answer: (C)

To determine the required takeoff distance to clear a 50-foot obstacle at a temperature of 3°C and a pressure altitude of 6,000 feet while weighing 3,000 pounds, it’s important to consider how temperature, altitude, and aircraft weight affect aircraft performance during takeoff.

At a pressure altitude of 6,000 feet, the air density is lower than at sea level. This reduced density impacts the lift generated by the wings and the thrust produced by the engines, typically requiring longer takeoff distances.

The temperature of 3°C also plays a role, although at that altitude it is relatively mild. However, in aviation, takeoff performance charts typically calculate the distances required under standard atmospheric conditions, which means that colder temperatures usually result in shorter takeoff distances, while warmer temperatures have the opposite effect. At 3°C, while it is not as extreme as higher temperatures might be, it still contributes to the calculation since the air is less dense than standard conditions.

When you assess these factors with the specified aircraft weight of 3,000 pounds, you can see that this weight, combined with the altitude and temperature, points towards a specific calculation found in the aircraft's performance charts to arrive at the necessary takeoff distance