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-D100 Pilot’s User Guide
7-11
AP Button
: When its indicator is off, pressing the AP button engages the AP in the pre-armed
mode(s) indicated by the Horizontal and Altitude Mode button indicators below. Depending on
how you have configured bug synchronization, the AP may synchronize the bugs for pre-armed
HDG, TRK, or NAV modes upon pressing the AP button. Read Pre-select Configuration on page
7-14 for more details on configuring this behavior for your needs. If no mode is armed, pressing
the AP button engages the AP in HDG mode only.
