Question

What is the use of the headwind?

(a) To change the datum height

(b) To change the datum temperature

(c) To change the fuel ratio

(d) To change the pressure ratio

I got this question in an international level competition.

The origin of the question is Effect on the Take-off Distances of Flight Variables in chapter Take-off and Landing Performance of Aircraft Performance

Answer 1

Correct answer is (a) To change the datum height

The explanation: The headwind is used to change the datum speed of the take-off. This headwind effects the ground run speed. For every 10% change in headwind, there is 20% decrease in the ground run distance.