Michael wrote:
wrote

My two cents worth: any autopilot that acts in that manner is probably
best not used for "coupled" approaches.


I concur. But then I'm not a fan of doing coupled approaches with
old-technology autopilots anyway.


I put "coupled" in quotes
because a truely coupled approach would be independent of the heading
bug once the localizer has been captured.


Do you fly an approach without reference to heading once the localizer
is captured? Of course not - you fly a heading, and use the CDI as a
correction on the heading. So do most Century autopilots. There is
nothing wrong with using heading information to stabilize the
approach. The problem is with the way the unit does it.

I make reference to the heading, but once coupled I have no autopilot
input to modify or adjust heading in any manner, so I certainly do not
fly heading while in NAV, APPROACH, or AUTOLAND modes. If I am hand
flying using the flight director while in NAV or APPROACH modes then,
indeed, I am using heading to track the course (course and vertical path
in case of ILS). But, the autopilot completely takes over steering of
heading when its doing the task, as its alway been with any autopilot
I've used since 1960 or so.