Page 869 - PPL-engelsk 2025

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We now return to our flight.

We must have found the time on each leg. We have cleared the wind so that it

is calm. From tables in the aircraft handbook, it appears that the aircraft's True

AIR Speed (TAS) at the selected altitude is 100 Kt.

We can now calculate the time on each route section (leg).

Route True Track Mag. track Dist. Time

EKHG → EKSD 254 252 18 10 min 48 sec

EKSD → EKLV 344 342 25

EKLV → EKHG 128 126 31

The innermost dial of the computer can be rotated.

When we calculate tasks that involve time, we have the time on the innermost

dial.

The red triangle is called the hour mark. An hour is 60 minutes. However, the
hour mark can also be 6 minutes.

The outermost scale, the one that cannot be rotated, is dedicated here to be

NM.

If you look closely, you will see that the

time 1 hour has been rotated below 10.

We can choose to say that the 10 is

100, and that is what we do here.

With the setup of 100 per hour, we

have the relationship between time

and speed, and can find out how long it

will take to fly any distance at 100 Kt.

Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 869