I have used 4.5 and then updated to ASV5. I never had this problem before I upgraded, but not really sure it is ASV but have to go through the process. While flying FS9 using AVS in about 30minutes at high altitude my air speed goes to zero and the aircraft goes straight down. Someone told me it was the pitot which is Shift H. I tried that but it didn't work in 747-400 and in the default 737 I turned it on and still crashed. If I fly without AVS everything is fine. That is why I am posting this message.Has anyone encountered the same. Thanks in advance for any help.

Hi,You can try with Prevent All Icing in ASV and see if this goes away while running ASV.Hope this helps,JimActiveSky Sales and Supporthttp://www.hifisim.com/images/asv_dev_team.jpg http://www.hifisim.com/images/asv_proud_supporter.jpg

You have to put on both pitot heat and wing anti ice when you encounter this problem.John

I have tried that and works great. Thanks for the info.