Page 721 - PPL-engelsk 2025
P. 721
Aircraft general knowledge
8.6.4.6 High Voltage Warning
If High Voltage lights up during flight, the generator has been
switched off due to high voltage. This can be remedied by restarting
the generator.
The most common faults for too high voltage are:
- V-belt for generator
- Battery collapsed
- Cable broken
- Carbon brushes worn out
Fortunately, this does not affect the operation of the engine, as the ignition
system for this has its own power supply via the magnets.
8.6.4.7 Voltmeter
Not all aircraft have a voltmeter. If it is in the aircraft, keep
an eye on it.
Here you can see the consumption for the
individual components in a 28 V electrical
system.
If it is a 12 V system, A (amperes) will be
twice as large.
Today, many aircraft are designed with 28 V systems, partly because of lower
losses, and partly because the cables can be dimensioned differently.
You can see more about the power supply here.
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Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 721
