One thing I never liked about the 76 was the lack of audio annunciation when/if the modes decoupled. Some later 76 models would alert you with a " decouple " audio warning - but not all of them and even then it seemed to be sporadic at best. So if you got distracted, you may not have noticed that George wasn't driving anymore. The 139 gives you a big old bell chime whenever a mode is uncoupled or decoupled and you get used to hearing it after selecting a function and then you confirm that selection with a color change on the PFD. So in the 76, you had to be real careful that the aircraft was coupled and remember who had charge of the FD panel/APs. The 139 only has one center console mounted FD panel so takes care of that problem.
The 76 has needle monitors which correlate/mirror the moving AP actuators but not the trim.
Last edited by Sir Korsky; 15th Feb 2020 at 00:58.
Reason: corrected bad memory