If you don’t have a flight plan then the aircraft managed speed doesn’t have any data to follow e.g. airport restriction 250kts/10000ft. The system is probably defaulting to the speed you are currently flying. I would recommend at least having a flight plan, so the plane has some data it can use, even if you want to fly in hdg.
Also, what plane are you using? 140kts is very slow for an aircraft such as the A320 or 737.
The real aircraft does that too if you transition to the approach phase.
Yes, but I assume that he was in clean or at least takeoff configuration…
Display MoreHi all,
Thank you for your answers.
To complete it happens recently with Q400 and A380 as well as A32x so mainly large airplanes.
I always have a flight plan and it is not happening during the approach phase only during climb.
Basically I flying manually for take-off, reach 6,000-7,000 feet and put the autopilot and around 18,000/22,000 feet the speed move from 280 to 140... I can after few second overwrite and increase the speed again but it is very surprising and can be dangerous...
I really would like to understand what is going. I don't have the feeling to overspeed the limit imposed by the location or altitude.
Thank you
EK
Are you using the copilot with the screen overlay or the autopilot in the virtual 3D cockpit?
Hi Jan,
I'm using the screen overlay only 
EK
OK, that changes everything. That's not the autopilot, that's the copilot. And yes, the copilot is allowed to change the speed for you. It also limits the airspeed between the minimum and maximum allowed airspeed when it's active.
