Dynon Avionics EFIS-D100 Installation Guide - Manual (Page 64)

Autopilot Installation and Configuration
Step 9d – Allow a few minutes of stable flight under AP control
Note that the AP is only flying in Altitude Hold Mode, so you will need to control the aircraft in
roll. Ensure that you are not affecting the Autopilot’s control of the pitch axis, so you can
determine the AP’s altitude hold and change performance.
Step 9e – Adjust pitch servo TORQUE and/or SENSITIVITY values as needed
On the EFIS, observe the AP status indicator (lower left corner - AP:OFF- ALT ) while the AP
flies. If the ALT indicator is frequently highlighted yellow, that is an indication that the Pitch
Servo is slipping and the torque needs to be increased. Occasional slips due to turbulence are
acceptable.
If necessary, adjust the TORQUE value in the EFIS > SETUP > AP > PITCH SERVO menu.
P
gle
If you have adjusted the pitch servo TORQUE value to 100% and are still seeing frequent
slips, you may need to move the linkage attachment point on the pitch servo 1 hole closer
to the shaft. When doing this, take all precautions to ensure that an over center condition
cannot occur and that the servo can provide the necessary travel for your system. If a
mechanical solution is not possible, you may wish to try a higher strength servo (e.g., if
you have an SV32 installed, try swapping for an SV42).
After verifying that the TORQUE value is set appropriately, watch closely for A
“wandering” around the target altitude. The AP should keep the inverted trian
of the altitude bug closely aligned with the triangle of the numerical magnetic
altitude indicator (as shown at right).
If excessive wandering is observed, increase the SENSITIVY parameter in the EFIS >
SETUP > AP > PITCH SERVO menu. If the AP control seems “twitchy” or aggressive,
decrease the SENSITIVITY value. All adjustments of SENSITIVITY should be done in
increments of 1 or 2, allowing you to notice subtle changes in control.
Step 9f – Initiate AP-controlled climbs and descents
Change the ALT bug to 500 feet above your current altitude via any of these methods:
 On the EFIS, enter the EFIS > AP > BUGS > ALT menu, press SEL► to highlight the
hundreds digit, and press INC + to set desired altitude.
On the AP74 or HS34, press the VALUE knob (or just begin rotating knob, if you have
configured the VALUE KNOB settings to allow for immediate adjustment of the altitude
bug) until the ALT bug adjustment window is displayed. Rotate the knob until the desired
target altitude is set.
As soon as the altitude bug is changed, the AP begins changing the aircraft’s altitude to follow.
Repeat this step, setting the altitude bug to 500 feet below your current altitude.
Step 9g – Verify pitch TORQUE and SENSITIVITY settings during climbs and descents
During an AP-commanded climb, observe the AP status indicator as you did in step 9e; if
excessive slipping is observed (indicated by a yellow highlight around the ALT status), then
increase the pitch servo’s TORQUE parameter. Repeat this verification in a descent.
6-28 EFIS-D100 Installation Guide