The later HS.121 Trident models did indeed have DROOPS.
These were not slats, nor were they leading edge devices, ala Boeing.
They were DROOPS.
And, yes there is a difference.
Now, as to the reference to the B707-400, yes it was indeed true, flaps up at 400agl.
This was also true for the B707-300 straight-pipe engine equipped aircraft as well.
Sterling performers these were...NOT.
How about...climbing at V2, at heavy weights, and achieving just 300-400 feet/min, with all 4 turning?
Never mind one inop.
The younger guys would be absolutely shocked.
