Page 523 - PPL-engelsk 2025

Principles of flight

The distance from the aircraft making contact with the ground until it comes to

a complete stop is called the landing roll.

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5.10.7 Landing distance

The factors that are used when we calculate the
landing distance are shown in the box here.

We will now look at them one by one.

5.10.7.1 Approach speed

Normally, the landing is carried out with an approach speed of:

1,3* stall speed

When landing in strong winds, e.g. >16 Kt, ¼ of the mean wind is added.

If there are gusts, e.g. 270/20g32, the higher of ¼ of the mean wind or ½ of the

gusts is added. Here, the gusts are 12 Kt greater than the mean wind, so the

approach speed must be 6 Kt higher.

If you fly at a higher approach speed than described in the aircraft manual, the

landing distance will increase by the square of the additional speed.

For example, if the speed is 50 Kt, and you approach at 55 Kt, i.e. a factor of 1.1,

you must multiply the landing distance by 1.1².

The result is that this gives an increase in the landing distance of 21%.

Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 523