Dynon Avionics EFIS-D10A Installation Guide - Manual (Page 61)

Autopilot Installation and Configuration
EFIS-D10A Installation Guide 6-21
When the AP is engaged and aircraft airspeed rises above the maximum, the AP enters an
airspeed hold mode, pitching the aircraft up to prevent exceeding the maximum airspeed.
When the aircraft’s altitude rises above the target ALT bug and the AP cannot pitch the aircraft
down without going above the maximum airspeed, the EFIS presents the prompt:
MAX AIRSPEED – REDUCE POWER
Airspeed Maximum is specified in knots, kilometers/hr, or miles/hr, depending on the units
chosen in the EFIS > SETUP > UNITS > IAS menu. Maximum/default: 5% below V
NE
.
To set the AIRSP MAX, perform the following (continuing from AIRSP MIN):
 DOWN▼ > (AIRSP MAX: value is highlighted)
 Press DEC - and INC + to adjust APRSP MAX to preferred initial setting for the aircraft.
Step 4e – Set Pitch Servo VSPD Maximum: The PITCH SERVO > VSPD MAX parameter is
specified in feet/minute (or meters/second, if the setting chosen in the EFIS > SETUP > UNITS
> ALT is METERS). This parameter sets the average vertical speed the autopilot will command
for climbs and descents. If you set this value above a vertical speed the aircraft can achieve, the
AP will run into the airspeed limiter in climbs and descents. Minimum: 100 feet/minute; default:
500 feet/minute; maximum: 4,000 feet/minute.
On the EFIS, perform the following (continuing from Pitch Servo Airspeed Maximum):
 DOWN▼ > (VSPD MAX: value is highlighted)
 Press DEC - and INC + to adjust VSPD MAX to preferred initial setting for the aircraft.
 > BACK > EXIT
STEP 5 – DISENGAGE/CWS BUTTON CONFIGURATION
We recommend that you perform the following on the ground at zero airspeed.
Step 5a – Enable/Disable Hold to Engage: Setting HOLD TO ENGAGE to Y allows you to
engage the Autopilot by holding the Disengage/CWS Button for more than 2 seconds. This
allows for a convenient alternative to engaging the Autopilot via the menus and/or AP74 AP
button. Default is N.
When this mode is active, anytime the autopilot is disengaged you can engage it by pressing and
holding the Disengage/CWS Button for more than 2 seconds. Note that after 2 seconds, the AP
status indicator at lower left of the EFIS screen shows
AP:CWS-CWS . This indicates that the
servos are in Control Wheel Steering mode and are waiting for the button to be released before
engaging.
Step 5b – Enable/Disable Broken Disengage Line Detect: The BUTTON CONFIG >
RESISTOR INST parameter should only be set to Y if the optional 5 kΩ resistor is installed
across the Disengage/CWS Button, as shown on page 6-3. If the resistor is installed and this
parameter is set to Y, the EFIS continuously monitors the AP Disengage/CWS Button circuit for
proper resistance. If a broken line is detected the following message is displayed on the EFIS:
AUTOPILOT DISCONNECT LINE BROKEN
If the AP is engaged when this condition is detected, it will remain engaged.