Hi DontSync,

Thanks for your reply, I had never heard of the mentioned "elevation protection" before, but it makes sense, you'd not want to open the windows in flight, and I was starting from Flytampa Zurich, windows opened, and landing at a freeware Samedan, using UTX GEX europe, which is alot higher. You have peeked my interest and I will try again at an addon at sea level and see what happens.

I will have a look for your erroneous line under the wing next time I fly my 727 and let you know if I see it too.

Thanks and regards.

David Phillips.