In HSI mode, the autopilot will fly the lateral course guidance
that is displayed on the HSI from the provided source. For
example, if the selected HSI source is the SkyView GPS, and
there is an active Flight Plan, the autopilot will fly that flight
plan. Or if the source is a VOR the autopilot will seek to
capture and hold the set CRS to or from the VOR. If the HSI
source provided GPS roll steering commands (GPSS) the
autopilot will follow those commands.
Figure 221 – Simplified Autopilot Roll Modes
The following table summarizes the different autopilot modes of operation for the pitch axis.