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In order to fly a steady co-ordinated horizontal rate one turn at a lower airspeed, the bank angle must be:
  • A
    increased and the turn radius will increase.
  • B
    decreased and the turn radius will increase.
  • C
    increased and the turn radius will decrease.
  • D
    decreased and the turn radius will decrease.

The formula for turning radius is as follows

r = v2 / ( g * tan(bank angle) )
r = radius
v = velocity
g = gravitational constant (9.81, however in some questions stated to be 10)

From this formula we can derive that the radius of turn decreases with decreasing airspeed.
If we fly at a lower speed and still keep the same bank angle, the rate of turn will increase.
Therefore, if the speed decreases and we still want to achieve the rate one turn (3 degrees per second) we have to decrease our bank angle.

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