ORIGINAL: Heer
@ John
no the are from a A 380, sorry I don't use US-hardware !
I do this modification for short landings on small fields.
We don't have so large runways like you in USA.
With this slotted flaps are steep descendings possible without high increase of the speed.
Brg
Fritz
Fritz we fly of 100 meters(300ft) and need only half of this for landing.
i suggest looking at CG