Thanks I got it working. Just had to change it a bit but that was easy.
Typed it out like this: (getpos heli select 2) < 2
I'm using Helicopter Transport script by Skumball which is great but the engine stays on while it waits at whatever point player has directed it to so I wanted to add a couple triggers to stop engine by using setfuel command but I didn't want anyone stopping engine while chopper was high in air & crashing it. Thats why I needed the extra condition for chopper to be low.
Works great, thanks again.