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Human Performance

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2.6.5 Fatigue and exhaustion

Flying requires alertness. Fatigue and exhaustion both reduce alertness, which
can have fatal consequences.

2.6.5.1 Fatigue

Fatigue can be the result of prolonged, sustained physical and/or mental stress.

It is a feeling of reduced energy.

We are all familiar with acute, short-term fatigue after a day's work. A need for

rest and recovery arises. A good night's sleep removes acute fatigue.

The short, dangerous periods that can be achieved with microsleeps have no

restorative effect! They can be extremely dangerous if you are a pilot, driver or

anything else that requires full and constant attention.

The consequences of fatigue can be:

- Reduced work capacity and performance

- Feeling tired

- Desire for rest/sleep

Fatigue usually disappears after rest or sleep.

2.6.5.2 Exhaustion

Exhaustion is a more extreme form of tiredness than fatique. The body or mind

feels completely drained of energy, and this cannot be easily remedied with

rest or sleep.

Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 176