Using the Asobo 747 and A320, I noticed the autopilot cannot be engaged on the ground. Pressing the CMD button (in 747) or AP1(in A320) has no effect, which is confirmed with the SimVar Watcher: the AUTOPILOT MASTER simvar value is always 0.
On the other hand, it works fine with the Cessna Caravan, I can activate the AP on ground, the light runs on and the simvar is set to 1, everything is OK.
I can't understand this difference. Of course I saw the min_feet_for_ap setting in systems.cfg, but for all these planes it is not defined, which means it takes the default value of -1000, which menas it is disabled. To make sure, I added the line: min_feet_for_ap=-1000 in my aircraft systems.cfg and it didn't change anything, the autopilot still can't be activated on the ground.
Do you have any explanation? Did I miss something?