There are five main flap positions: 0, 1, 2, 3 and Full. However, there is actually one more called ‘1+F’ in a real A320. What it means is that, due to the A320’s design, ‘Flaps 1’ when extended in the air (for example during approaches) only extends the slats. Nevertheless, there’s more to it. When ‘flaps 1’ are extended during takeoff, the aircraft is actually running the flaps on 1+F because both the slats and flaps are extended. (The ‘F’ means ‘flaps’, hence 1 (slats) + F (flaps).) There is no true ‘1’ position in IF, because whenever you select ‘1’ the flaps always come down along with the slats, meaning that it is more of a ‘1+F’
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