TruTrak DFC Operating Manual User Manual

Page 16

will now move to the torque
setting:

In a manner similar to

activity, use the encoder knob to
select the desired value of pitch
servo torque. This value should
be between 75 and 250. A
default value is set at the factory
but may need to be modified to
suit a particular aircraft. The
value chosen should be
sufficient to fly the aircraft, but
not so much that it is difficult to
override the autopilot if
necessary.

Having selected the desired

torque level, again press and
quickly release the encoder
knob to confirm and enter the
selected torque value into
storage. The next screen will
show:

Use the encoder knob to

select the minimum airspeed at
which the autopilot will fly the
aircraft. This speed should be a
safe margin above a stall. Press
the knob to enter the minimum
airspeed into storage, and the
cursor will move to the second
line, as shown below.

Select, using the encoder

knob, the default value most
commonly used for a climb to a
selected altitude. Press the

encoder knob to enter this value
into storage.

MIN AIRSPD 120KT
NORM CLIMB 170KT

VRT ACTIVITY 4
VRT TORQUE 200

The next screen in the pitch

setup sequence allows
adjustment to compensate for
the lag (delay) in the aircraft’s
static system.

STATIC LAG 0

Select the lowest value

over the range 0 to 2 which
results in the elimination of
“hunting” in the altitude hold
mode. This adjustment should
be done in still air at cruise
airspeed. Press the encoder
knob to enter this value into
storage.

This concludes the DFC-

series autopilot pitch setup
procedure.

MIN AIRSPD 95KT
NORM CLIMB 120KT