Question

What is meant by decision speed?

(a) The speed at the point where there is unequal distances on the take-off run

(b) The slope at the point where there is unequal distances on the take-off run

(c) The slope at the point where there is equal distances on the take-off run

(d) The speed at the point where there is equal distances on the take-off run

I had been asked this question by my college director while I was bunking the class.

Question is taken from Take-off Performance in section Take-off and Landing Performance of Aircraft Performance

Answer 1

Right choice is (d) The speed at the point where there is equal distances on the take-off run

Easy explanation: The decision speed is the speed at the point where there is equal distances on the take-off run. The decision speed determines the minimum safe length of the runway from which the aircraft can take-off.