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A pilot flies from Aerodrome A to Aerodrome B. The return flight to Aerodrome A is scheduled after a quick turn-around. Assume the same wind conditions for both flights. Given the following information, calculate the average groundspeed for the return.

Average TAS for the outbound flight: 135 kt
Average TAS for the return flight: 145 kt
HWC from Aerodrome A to Aerodrome B: 25 kt

  • A

    120 kt

  • B

    160 kt

  • C

    110 kt

  • D

    170 kt

Groundspeed (GS) is the speed of the aeroplane over the Earth's surface and equal to:

  • True Airspeed + TWC

or

  • True Airspeed - HWC.

Since the question assumes the same wind conditions for both flights, then the HWC from Aerodrome A to Aerodrome B, switches into a TWC from Aerodrome B to Aerodrome A of equal magnitude: 25 kt.

Thus, the Groundspeed from Aerodrome B to Aerodrome A will be: Average TAS for the return flight + TWC = 145 kt + 25 kt = 170 kt.

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