I've never seen Flaps 1 or 10 in 15 years on the 727. Some had 20 though. You got the #2, 3, 6 and 7 slats with flaps 2 and all the rest of the slats and all the Kruegers with flaps 5.

Blocking 40 meant you'd use less thrust on approach and therefore be quieter coming in. There's one hush kit that has you landing with flaps 25 but I'd say most folks still land "30, 30, green light."

And all that stuff is anti iced after it unfolds except the #1 and 6 Kruegers with bleed air. All sorts of telescoping and twisting tubes.