Page 743 - PPL-engelsk 2025
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Aircraft general knowledge
8.9.5.3 Fuel injection
Modern aircraft have adopted the fuel injection technique. Fuel and air are
mixed immediately before each cylinder, or the fuel is injected directly into each
cylinder.
This allows for very precise control of the mixture ratio – and thus better
economy.
It can be done electronically and monitored electronically. There is no problem
with carburetor ice!
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8.9.6 Engine lubrication
Lubrication of the engine is necessary to reduce friction between moving parts,
prevent overheating and protect against wear and corrosion.
The engine is lubricated with oil, which may have been added with additives that
have a corrosion-inhibiting effect.
The oil pump provides pressure. The oil pressure is regulated with the Relief
Valve, which can be adjusted.
The oil flow is controlled by valves. The bypass valve directs the oil around a
blocked filter if necessary.
There can be 2 different sump systems:
- Wet sump
- Dry sump
8.9.6.1 Wet sump
The oil is stored in a sump at the bottom of the engine.
Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 743
