I click on the FD and it goes on. But when I click on the A/T ARM it either goes on and then immediately off or it doesn't move at all.What am I doing wrong please?Cliff

Cliff -I bet it's the same as this one: http://forums.avsim.net/dcboard.php?az=sho...id=71539&page=2

Thanks Per....problem solved. And thanks too for drawing my attention to the Search facility which I've just used to solve another problem.Cliff