TruTrak EFIS AP (8300-057C) - Manual (Page 20)

TruTrak Flight Systems 18 EFIS Autopilot Installation Manual
irst
rticular
rak, it is advisable to start with a setting of zero and work up from there.
ns would ultimately require somewhat higher settings.
On the the
AP but he
SEL (s
First Flight
The first flight should be done after having completed all the setup and testing on the ground. For the f
flight, it is important that the GPS unit is properly functioning with the EFIS.
The two activity adjustments (LAT ACTVTY and VRT ACTVTY) determine how briskly the autopilot
responds to roll and pitch disturbances. They can be adjusted, in flight, over a wide range; thus the
autopilot can be tailored to adapt to any aircraft installation.
Each of the two activity adjustments covers a numeric range of 0 to 36. Unless the value for a pa
aircraft is provided by TruT
Most installatio
Prior to takeoff on the first flight, a barometer set will be required; the default value will always be 29.92.
first flight, manually fly the aircraft to a suitable area for testing. Engage the autopilot using
ton. Observe that the TRK GREEN BUG now shows the captured present ground track and t
elected vertical speed) field shows the approximate present rate of climb or descent in feet pe
. Use the right knob to set the selected vertical speed to zero. Press the right knob for a few
s until SETUP is shown on the display in the same location that AP was, click the soft key below
the setting for the AP. Select the LAT AP then
r
minute
second
to enter ACTVTY, default is 3. Rotate the knob to select
the valu in
conditi
e zero (0), and observe the resulting control movement. It is best if these adjustments are made
ons of moderate turbulence (the EFIS loves turbulence) so as to make it easy to observe the
e of the autopilot to disturbances. Increase the value one setting at a time, taking time to observe
easing level of control response. At some point, if too hi
nd over-active. Back the setting down until the autopilo
respons
an incr
gh a setting is chosen, the autopilot will be
jittery a t is responsive but not over-active. It will
vity setting will be acceptable; too low a value will result in
. It should be noted that any builder can accomplish this adjustment procedure and no
served in very still air. Sometimes there will be a small amount of lost motion
n.
,
return to the setup screen.
. Click
the appropriate response. Again,
too high a value will be jittery or oscillatory and too low a setting will be sluggish and unresponsive.
Having found the desired VRT ACTIVITY setting, click the right knob to return to the setup screen.
be noted that a fairly limited range of acti
sluggish response, while too high a value will result in nervous, inappropriate response. Within this
acceptable range there is room for individual preference; some people prefer a more aggressive autopilot
than others
professional is required. Once the desired LAT ACTVTY level is established, click the right knob to
return to the setup screen.
MICRO setting in most aircraft will be left at zero (0). Micro activity is used only in aircraft in which a
slow wing rock has been ob
in an aircrafts control system, and the micro activity setting is a way to compensate for the lost motion.
Once the desired MICROACTIVITY has been selected, click the right knob to return to the setup scree
The HALF-STEP setting in most cases will not need to be changed. If the half step setting is set to ON,
then the roll servo will now have higher resolution, and take smaller steps. While this setting will make
the servo take smaller steps, it will decrease the amount of available torque. This setting should be left at
OFF, unless it is observe that the wing moves up and down very slightly while in straight and level flight
in very still air. Once this setting has been done, click the right knob to return to the setup screen.
BANK selection screen default is MED. Set the desired bank angle that is comfortable, options are LO
about 12.5 degs, MED about 19 degs, and HI about 25 degs. Once the BANK ANGLE has been selected
click the right knob to
Having set the autopilot for its proper roll response, it is time to move to the pitch axis adjustments
the VRT AP button that is shown on the first set up screen. Then click ACTVTY, in the same manner as
was done for the roll axis, use the knob to find a setting which results in
April 2009 8300-057 Rev D