TruTrak DFC Operating Manual - Manual (Page 5)

4
Controls
Switches labeled
[MODE]
and [ALT] when depressed
sequentially step through the
respective lateral and vertical
mode setup screens. When the
desired setup screen is
displayed, the numerical data to
be entered will be underlined.
The data is then set by rotating
the encoder knob and entered
by depressing and then quickly
releasing the knob. This will be
referred to hereafter as enter.
Another means of entering
numerical data is the sequential
pressing of a [VS] switch.
Each time a [VS] switch is
pressed, the vertical speed will
be changed in increments of
100 feet per minute. Still
another means of altering the
display presentation is engaging
or disengaging the autopilot.
This is accomplished by using
the [ON OFF] switch on the
programmer or the switch
located on the control wheel or
stick. The control stick switch
serves a dual purpose.
Momentary closure will
disengage the autopilot. If the
switch is held closed more than
two seconds, the autopilot will
engage upon release. This
means that in addition to
disengaging the autopilot, this
switch also provides the
function referred to as Control
Wheel Steering in that the
autopilot synchronizes to both
direction and vertical speed
upon being engaged.
Lateral Modes
Upon being engaged, the
autopilot will be in the basic
lateral mode, and it will be
synchronized to the direction
being flown at the time. (See
figure on page 3.) Note: The
number following
SEL
(Selected
direction) is underlined,
meaning that rotation of the
encoder will select heading.
Rotation of the knob when it is
not depressed will cause 5
°
steps of
SEL
and when it is
depressed the steps will be 1
°.
When an external heading
source (DG or HSI) is present,
depressing [MODE] one time
will select the
EXT DG
entry
screen. If this is the desired
mode, pressing the encoder
knob makes it the active lateral
mode. When in this mode the
heading “bug” within the
external DG or HSI will be used
to control direction.
The next sequential entry
screen will be either GPS NAV or
GPSS
depending on which, if
either, steering signal is
available to the autopilot.
TRK 135 ALT 4500
EXT DG SVS 500+
In
GPS NAV
mode the
autopilot follows a flight plan
programmed into the GPS. The
autopilot will however overfly
each waypoint prior to turning
and intercepting the course line
to the next waypoint.
TRK+135 ALT 4500
GPS NAV SVS 500+