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Airport Engineering - Engineering

Q1:

Pick up the correct statement from the following:

A The speed of the aircraft relative to the ground, is called cruising speed

B The speed of the aircraft relative to wind, is called air speed

C When wind is blowing the direction of the flight, air speed is less than cruising speed

D All the above.

ANS:D - All the above.

Airspeed is the vector difference between the ground speed and the wind speed. On a perfectly still day, the airspeed is equal to the ground speed. But if the wind is blowing in the same direction that the aircraft is moving, the airspeed will be less than the ground speed.