Originally Posted by
212man
I’ve not flown the 139, but other automated types I have will keep the heading very accurately if you keep your feet off the pedal micro switches, and typically do so even with some bank applied below a certain IAS, above which they revert to coordinated turn mode. It’s not even a function of the automation - it’s a fairly basic ATT mode AFCS function.
The 139 works exactly like that....