Page 739 - PPL-engelsk 2025

Aircraft general knowledge

However, the air intake can be blocked by ice.

Some aircraft are equipped with a spring-loaded

damper, as shown in the illustration, which

automatically opens for air supply from the

engine compartment.

Not all engines are equipped with the

system, but most engines with an

injection system are.

In the section in the red ring above, the

carburetor preheater is closed.

In the section in the machine, the

carburetor preheater is opened.

8.9.4.5 Cowl flaps

Some aircraft are equipped with cowl flaps, which are operated via levers in the

machine.

These regulate the amount of air for cooling the engine.

High-performance aircraft need to be able to

regulate the engine temperature during flight.

During take-off and climb, the cowl flaps must be

opened.

During take-off and climb, the speed is relatively

low, and it is necessary that the cooling is good, so the cowl flaps are open.

During cruise flights at high speed, the engine will not reach ideal operating

temperature unless the cold air is slightly closed off.

Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 739