TruTrak Digiflight II Operating Manual - Manual (Page 5)

4
Controls
The Digiflight II series
autopilot uses the simplest
controls available. All
programming is done via a
rotary encoder knob and two
buttons labeled MODE and
ALT. The MODE button
toggles between the default
(TRK) mode and the
GPSS
mode (or GPS
NAV
mode if
GPS steering is not available),
as well as moves the cursor
back to the SEL numerals. The
ALT button engages altitude
hold or moves the cursor to the
SVS numerals. If in the
GPSS
mode, the ALT button will
engage the
GPSV
mode, if it is
available. Both buttons are also
used to enter the setup modes as
well as maneuver through the
setup screens. Engaging the
autopilot can be done either by
momentarily pushing and
releasing the encoder knob on
the programmer or by pushing
and holding the switch located
on the control wheel or stick for
more than two seconds and then
releasing. Disengaging can be
done either of two ways: by
pushing and holding the
encoder knob on the
programmer for approximately
three seconds and then releasing
the knob, OR by momentarily
pushing and releasing the
switch located on the control
wheel or stick. 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.
Initializing the
Autopilot
The autopilot master switch
should be in the off position
when the engine is started.
Aircraft electrical systems can
generate voltage transients
during an engine start, and like
other avionics systems, the
autopilot should not be
subjected unnecessarily to these
conditions. After start up, turn
on the autopilot master switch
and hold the aircraft stationary
as the internal gyros are
initialized. The model and
software version will be
displayed for approximately ten
seconds in the lower left. Then
PWR UP
in the lower right
takes approximately another ten
seconds.
When initializing is complete
PWR UP
will change to
AP
OFF