EFIS-D100 Installation Guide - Dynon Avionics
EFIS-D100 Installation Guide - Dynon Avionics
EFIS-D100 Installation Guide - Dynon Avionics
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Autopilot <strong>Installation</strong> and Configuration<br />
STEP 3 - ROLL SERVO INITIAL SETUP<br />
We recommend that you perform the following on the<br />
ground at zero airspeed.<br />
Step 3a – Set Roll Servo Torque: The ROLL<br />
SERVO > TORQUE parameter specifies how much<br />
torque the servos will exert before slipping. Servo slip<br />
is indicated by a yellow background on the slipping<br />
axis in the AP status indicator. Torque must be set<br />
high enough to prevent any slip due to air loads, but<br />
low enough that the pilot can comfortably override<br />
the AP should the need arise. If the servo slips continuously, the AP cannot fly the aircraft.<br />
Torque is specified in % of maximum the servo is capable of exerting. Minimum: 10%,<br />
maximum 100%, default: 100%.<br />
On the <strong>EFIS</strong>, perform the following:<br />
If not already in the SETUP > AP menu, enter the menu and select ROLL SERVO and press<br />
SEL►<br />
(TORQUE value is highlighted)<br />
Press DEC - and INC + to adjust TORQUE to preferred initial setting for the aircraft.<br />
It may take some experimentation to find the right value for your aircraft, but if you are<br />
comfortable overriding the servo with the default value of 100%, it is safe to leave that setting at<br />
the default value. To test servo override, exit the SETUP > AP menu and return to the main <strong>EFIS</strong><br />
menu. Center the aircraft controls. Enter the <strong>EFIS</strong> > AP menu and press HDGOFF. Note that the<br />
mode toggles to HDGON, the HDG bug synchronizes to the current heading, and the roll servo<br />
engages. Ensure that the controls do not deviate far from center.<br />
If you have an AP74 installed and configured, you can accomplish this same procedure<br />
by doing the following: Push the HDG button to ensure that it is lit; push the ALT button<br />
until it is not lit. Push the AP button to engage the AP in Heading Hold mode.<br />
Now, take the controls and override the servo by moving to either roll left or roll right<br />
(remember, you are only overriding the roll servo, so you should feel no resistance in the pitch<br />
axis). Ensure that you are comfortable with the amount of force it takes to override the servo. If<br />
you are not, decrease the roll servo TORQUE value by 10% and repeat the test.<br />
Step 3b – Set Roll Servo Sensitivity: The ROLL SERVO > SENSITIVITY parameter specifies<br />
the how fast or slow the AP responds to deviations between commanded direction and actual<br />
heading or track. If Sensitivity is set too low, the aircraft will “wallow” during changes in<br />
heading. If Sensitivity is set too high, the aircraft will be “twitchy,” with frequent, fast,<br />
aggressive adjustments. Sensitivity is specified in digits. Minimum: 1 (low sensitivity),<br />
maximum: 25 (high sensitivity), default: 10.<br />
This parameter can be tuned in flight; leaving it at the default of 10 is sufficient for initial setup.<br />
If the autopilot is not as “decisive” as you’d like, increase this value; if it is too aggressive,<br />
decrease it.<br />
On the <strong>EFIS</strong>, perform the following (continuing from TORQUE):<br />
<strong>EFIS</strong>-<strong>D100</strong> <strong>Installation</strong> <strong>Guide</strong> 6-17