Page 697 - PPL-engelsk 2025

Aircraft general knowledge

In the table below you can see different types of slots and the lift increase that

is in relation to the basic profile.

At the top, the basic profile,
then five different types of

flaps.

The three lower figures show

leading edge slots.

As you can see from the

table, slots give a larger
critical angle of attack.

8.3.7.5 Slats

Slats (boards) are also placed on the wing leading edge. It can be slid diagonally

downwards and increase the curvature of the profile. The purpose of slats is to
increase the critical angle of attack.

Slats are mostly used on larger aircraft.

Leading edge slats on commercial aircraft and fighters move diagonally forward

and downward and lie close to the leading edge of the wing without forming

slots.

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Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 697