Dynon Avionics EFIS-D10A Pilots Users Guide - Manual (Page 71)

Autopilot Operation
AP74 Autopilot Control
This section describes how to control the Autopilot via the AP74. When an AP74 is installed, the Autopilot can still be
controlled via the EFIS-based AP menu. The AP74 has all the functionality of the EFIS > AP menu, while providing a
more efficient way to interpret and use the Autopilot. It also provides some additional features, such as the ability to arm
modes prior to engagement, and easy adjustment of AP targets via its dedicated knob.
AP74 INDICATORS
The AP74’s button indicators (red lights) have the following meanings:
 AP button indicator: ON when any Autopilot axis is active (i.e., servo controlling aircraft).
 HDG button indicator: ON when lateral/roll servo is armed or active in Heading Mode. If the
AP button indicator is on, the roll servo is active in Heading Mode. If the AP button i
is off, the roll servo is armed in Heading Mode. ndicator
 TRK button indicator: ON when lateral/roll servo is armed or active in Track Mode.
 NAV button indicator: ON when lateral/roll servo is armed or active in Navigation Mode.
 ALT button indicator: ON when vertical/pitch servo is armed or active in Altitude Mode.
AP74 CONTROLS
EFIS-D10A Pilot’s User Guide 7-11
Each of the four mode buttons on the AP74 is only usable if the associated modes are enabled,
and configured, and the necessary device(s) are connected. For example: if a GPS is not
connected to the system, the TRK and NAV buttons cannot be used; if a pitch servo is not
installed, the ALT button cannot be used. The mode buttons and indicators correspond to the
Autopilot modes described on page 7-5.