In case Kumpu doesn't have time to fix this great little mod here is a quick fix.
open the zip with the mod and open this file:
/Helicopters_0.2.13/prototypes/entities/heli_entity.lua
Go to line 10 and 97 and change
flags = {"pushable", "placeable-off-grid", "player-creation"},
to
flags = {"placeable-off-grid", "player-creation"},
I have no idea if it breaks something, but i loaded the mod a flew a little around the and everything seems to work.
PS. thanks for a fun little mod (: