Page 762 - PPL-engelsk 2025
P. 762
Aircraft general knowledge
8.12.2 Engine instruments
The engine instruments are mentioned in the order in which we use them during
the flight.
8.12.2.1 Tachometer and hour meter
Before the flight, the aircraft's logbook is checked for any
notes from the last flight. It is also checked whether the
aircraft is due for inspection or service on a specific
component.
Therefore, we check the hour meter (tachometer).
The hour meter is combined with the tachometer. The tachometer shows the
engine's speed. If there is a fixed propeller, it is an expression of how much
power the engine is producing.
The tachometer is provided with a green area from 500 to 2700 rpm. Normal idle
is usually 1000 rpm.
Some engines have a critical area with respect to revolutions, e.g. 2100 to 2250.
This area will then be marked yellow.
8.12.2.2 Fuel gauge
During the external inspection, the tanks are drained, and the tank contents are
measured. Before starting the engine, the engine must be primed, and this is
done with the fuel pump switched on. Here, the fuel pressure is checked, and
the tank gauge reading is compared with the readings
made of the fuel quantity.
The tank gauges show full when full and empty when the
tank is empty. Between the two positions, reading cannot
be completely trusted. Therefore, we always measure the
content with a dipstick before flight.
Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 762
