I'm sure this has been addressed before but I searched and couldn't find anything.
I have tried several different panels in a project opensky A330-300 and can't seem to get the speed control to work. Some of the panels in other aircraft have a speed on/off button but I can't locate one in any of these.
Once in flight I push the "speed" button after setting the IAS speed to 250 kts but I can't get it to engage. Any ideas?