Page 783 - PPL-engelsk 2025
P. 783
Aircraft general knowledge
The concept is called deviation and is the angle between what the compass
points to and the magnetic north pole (on our part of the globe).
Another source of error in the compass is a concept called inclination.
In the figure here you can see what it is.
As can be seen, the field lines are almost vertical at
the poles. The angle becomes smaller the further
south you go.
In practice, this causes the compass needle to have a dip towards the magnetic
north pole.
When it is slightly tilted and the suspension point is in the center, the end facing
away from the north pole will have a greater mass and the center of gravity will
be offset from the suspension point. This will cause acceleration errors on east-
west courses. On north-south courses it will cause errors when turning.
Avoid placing things that can interfere with the compass near the compass
(headsets, GPS antennas and sunglasses).
8.12.9.2 Remote compass
In newer aircraft, in addition to the mandatory magnetic compass, a remote
compass is placed in the rear fuselage of the aircraft, where it is least affected
by foreign magnetism.
The remote compass is electronic and “slaves” or drives the direction indicator
eliminating the need to adjust it periodically.
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Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 783
