Mooney M20M, Pilot Operating Handbook

Page: 283 / 377

GI 275 Part 23 AML STC
190-02246-12 Rev. 4
Airplane Flight Manual Supplement Page 43 of 70
FAA APPROVED
4.2.3 GPSS Emulation
When enabled by the installer for autopilots that do not support GPSS roll
steering, GPSS allows a configured legacy autopilot to fly GPS curved plan legs
(e.g., arcs, procedure turns, etc.) as well as straight legs. When the GPSS
emulation mode is enabled in the GI 275 ADI, the autopilot will direct the
aircraft to and then guide the aircraft along the active GPS flight plan leg. To
use GPSS:
1. Select the desired GPS navigation source on the Pilot’s ADI.
2. Enable GPSS emulation on the ADI using the AP REF button in the
Menu → Options → NAV Options → HDG Options menu.
3. Engage the autopilot in HDG mode.
NOTE
When GPSS emulation is enabled, the GI 275 ADI’s heading
bug function will be disabled. This is indicated by a hollowed-
out heading bug, and the ADI/HSI heading button will display
“GPSS” near the crossed-out heading bug. The “GPSS” text
will be white when GPSS commands are available, and it will
be yellow when there is no GPSS command available.
The following images show GPSS mode active, but no signals are sent.
The following images show GPSS mode active and sending signals.
NOTE
The GPSS commands to the autopilot are based on the GPS
source displayed on the pilot’s side ADI (typically the primary
ADI or ADI #1).