Is that possible when i make a stuff like engine only activate when touching a ground and stop activating when hovering in air using group activate? and how to set a speed decision? for example i have a engine and it only activate when plane touching ground at speed 200-50. if speed less tan 50 the engine is not active anymore and if the plane take off so the plane not touching ground... the engine not activate.

i have seen this code on someone plane, but this code is only activate engine on ground speed 0-50 so if ground speed is more than 50 the engine will stop working (from low to high)
i wanna turn it to > (from high to low)

here's the code

(((-(floor(min((TAS/13.41), 1)))+1)*Activate-

the 13.41 is speed decision

thank you. hope someone help me :)