"Regarding normal flap operation: I never understood how the flaps 1 position worked on an airbus. I see the flap lever only has a "1" position, but the indicator sometimes says 1 or 1+F. So when would it have flaps in addition to slats? Is it an FMS input or system logic?”
This is a great question!
This is how the system works:
Anytime the flap lever is moved to position 1, the slats move.
The question is… when will the flaps come out?
In this photo, the flaps and slats are out… thus the 1+F. Meaning, flaps 1 has been selected, and on the left we see that slats "S" are in position 1, and on the right flaps "F" are in position 1.
If only slats were out, then we would only see 1.
In addition to the slats, the flaps will move to 1 when…
- Anytime on the ground.
- Anytime we’re retracting from flaps "greater than" 1, the flaps will stay at 1 until we move them to "O" position.
Sequentially this makes sense when retracting. We wouldn’t want them to go from flaps 2 to up, losing our lift, until we're ready
When won't we get flaps 1 when we select the 1 position?
- When airborne and we go from a clean wing to flaps 1 selection we only get the slats. Flaps will not come out until we select flaps 2 position.
When flying this plane everyone knows that Flaps 1 on arrival doesn’t really do a whole lot for slowing their plane. Do they know why? I'm not sure how many remember that we don't even have flaps when we select 1.
So what would be a really good beer question?
- In flight when you select flaps one, how many flaps come out? Answer…. ZERO.
Enjoy the Journey!