QUOTE (jgoggi @ 06/11/2010, 16:14)
Massimo, do you mean I did not enter the correct format for the altitude constraints?
Do you also mean that in Maddog 2010 speed constraints are not implemented?
By the way, I found out that the "AT" is quite followed, while what is often overlooked is the "AT OR ABOVE" constraint, the aircraft overflies the waypoint too high. But it doesn't happen all the times, I'm trying to understand why at times it is respected and at times not.
Your constraints are ok anyway. Try to select 250A.
What I have reported is the correct FMS constraints syntax format input.
By the way, as I have mentioned in others reply, the FMS functions aren't 100% reliable, specially for computation and predictions related to vertical path.
I have seen your picture, and you are 0.3 NM outbound NORNI. So if you have armed a lower altitude before reaching or before passing the active waypoint, the system will follow the speed and the precomputed altitude or, if inserted, the speed and/or constraint altitude for the active waypoint.
In this case if the FMS for the waypoint before NORNI wpt, it was precomputed a lower altitude or a lower constraint altitude it was selected, arming a lower altitude will cause a change in the vertical profile that will bring the aircraft to catch (as probably in your case) the lower level.
I apologize, but unfortunatly it is difficult to found on the web a complete Honeywell FMS literature; for this reason the complex FMS system it isn't 100% reliable. I hope as soon, some simmer will help the community in this way.