Dynon Avionics EFIS-D100 Installation Guide - Manual (Page 67)

Autopilot Installation and Configuration
EFIS-D100 Installation Guide 6-31
PRE-SELECT CONFIGURATION
In the -BUGS- section of the AP74/76 SETTINGS menu, you can choose when the heading and
altitude bugs should be synchronized to their respective current values:
 ON ENGAGE: The HDG and ALT bugs are synchronized to the heading and altitude values
each time the AP is engaged (via the AP button on the AP74 or in the EFIS AP menu). This
is the default setting.
 ON MODE ARM: The HDG and ALT bugs are synchronized when their respective mode is
armed. When the HDG or TRK buttons are pushed on the AP74, the HDG/TRK bug is
synchronized to the current heading. When the ALT button is pushed on the AP74, the ALT
bug is synchronized to the current altitude. When the autopilot is engaged, the bug settings
are not modified. This allows you to enter a desired heading and/or altitude prior to engaging
the AP.
 NEVER: The HDG and ALT bugs are never automatically modified by turning on the AP or
changing AP modes. Be aware that the bugs are highly likely to be set far away from the
current heading and altitude at the time of AP engagement; this will result in the AP
immediately commanding a turn and a climb or descent at time of engage. When using
this mode, we recommend that you verify the EFIS’ bugs settings prior to EVERY
Autopilot engage.
MODE CLEARING CONFIGURATION
In the –CLEAR MODES– section, you can configure whether the autopilot clears the active
modes (HDG, TRK, or NAV; and ALT) on AP disengage. If you select NO, the AP leaves the
mode(s) pre-armed when the AP is off. This leaves the last-used roll mode (HDG, TRK, or
NAV) and/or pitch mode (ALT) lights lit on the AP74. You may, of course, switch to new modes
prior to re-engaging the AP. If you select YES, the AP disarms all modes upon disengaging the
AP, turning off all mode lights on the AP74. You must then select the active modes prior to re-
engaging the AP (although if no modes are pre-armed, pressing the AP button causes the HDG
mode to be engaged by default).
Clearing modes on disengage is most useful when used in conjunction with the ON MODE
ARM pre-select configuration above. This forces you to explicitly enable (and thus synchronize)
the modes you wish the autopilot to control when you press the AP button.
The default value for this setting is NO, leaving all modes pre-armed after turning off the AP.