User guide

The VRT ACTIVITY is displayed. Rotate the knob as necessary to set the vertical activity
value to a value of 2. Push the ALT button to move to the next setup screen.
The next setup screen is VRT TORQUE. Insure that the value displayed is set to the
maximum value of 12. Once that is done, press the ALT button to advance to the next setup
screen.
The next screen allows a MIN AIRSPD to be set. The minimum airspeed value is the
slowest indicated airspeed the autopilot will fly, independent of what it is commanded to do.
Rotate the knob to adjust this airspeed to a value safely above a stall but lower than normal
approach or climb out speeds. Select the desired value, and then press the ALT button to
advance to the next setup screen.
The next screen allows a MAX AIRSPD to be set. The maximum airspeed value is the
fastest indicated airspeed the autopilot will fly, independent of what it is commanded to do.
Rotate the knob to adjust this airspeed to a value safely below the red line airspeed, but
above the normal cruise speed. Select the desired value, and then press the ALT button to
advance to the next setup screen.
The next screen allows an adjustment for the amount of delay, or “lag” in the aircraft static
system. Start with a value of zero (0) until the first flight test of the autopilot. Having
verified this selection and set it to zero, press the ALT button to advance to the next setup
screen.
The next setup screen is MICRO ACTIVITY for the pitch axis, as with the lateral micro
activity this setting should be set initially to a setting of 0. Once the micro activity is set to
0, press the ALT button to advance to the final setup screen.
The final setup screen is the HALF-STEP setup screen. This screen is to change the
resolution of the pitch servo. Initially this setting should be set to N (No). Once this is
done, press the knob to exit and return to the main flight screen.
The next step in the check-out procedure is to verify that the servos run, and in the correct direction. At this point, the display
differs depending on autopilot model.
TruTrak Flight System 4 DigiFlight II Series Auto Pilot Installation Manual
December 2009 8300-008 Rev D
DigiFlight II DigiFlight IIVS
The screen will show that the
altitude portion of the
autopilot is still disengaged.
Press the ALT button to
engage the altitude hold
function.
Ø
The lower right of the
screen will show the
present value of s
elected
v
ertical speed, (SVS)
which will be
approximately zero. If it
is not zero, press the
ALT button to move the
cursor to the SVS field,
and then use the knob to
set the value to 0. The
display will change to
show altitude hold
mode.
Ø
In both cases, the selected heading will be underlined on the bottom left of the display, and the autopilot will be in the altitude
hold mode. Both the pitch and roll servos should stop, or move only very slowly.