Thanks for all your help everyone. I have been blown away by everyones help. I am not making any progress and I have tried everyone

Hi TristanI might as well throw my 2 cents into the mix.I have noticed that with FS2004 that the Auto Pilot is a little buggy.When I first got the program, like yourself I tried the Lear and found that at times when the auto pilot was activated, executing an ILS approach that the Plane would not capture the G.S. and I would manually have to fly the plane on the G.S.This may have been answered in previous post, have you tried another plane such at the 172 or 182 and see if they also will not respond to the Altitude input.Good Luck.Kenny G.

Greetings,I run FS9 on an old Dell 733/389ram/64mb nvidia card, with win98se.I also have FSUIPC (pay version) and have had no trouble with thedefault Learjet such as described above...in FSUIPC menu, on the"technical" tab the first item re "v/s" is checked...Maybe this will help?JR

Dunno...Whenever I've had that happen, resetting the "ALT" cured it. But by resetting, I mean you actually have to change the alt setting to another altitude setting, then change it back, and then reingage the ALT button. Say if you are at 32k and have the ALT set to 29k, but it won't descend at the stated 1800 fpm. Change the ALT to say 28K, and then roll it back up to 29k. And then reset the ALT. Actually, I don't even think you actually have to repress the ALT button, but might as well try it. That's never failed to work here, when thats happened. But it doesn't happen very often. My lear 45 does not have that problem normally. Neither does the 31a I fly.MK

Try engaging the altitude selector of the autopilot first and then engage the VS selector to the default 1800 fpm. In other words select the altitude you want, hit the altitude select buttom. This should set the VS at 1800 fpm. Then hit the VS button let it capture the 1800 fpm and then adjust as desired.