Dynon Avionics EFIS-D10A Installation Guide - Manual (Page 29)

EFIS Calibration and Configuration
EFIS-D10A (INTERNAL) HEADING CALIBRATION (ON GROUND AND IN FLIGHT)
NOTE: if you own the EDC-D10A Remote Compass Module, you do not need to perform this
set of steps. Skip to the next section for calibration of the remote compass.
EFIS-D10A Installation Guide 4-3
It is crucial that compass heading
calibration be done after the unit is
completely integrated into your
panel. If the unit is calibrated away
from the panel and then inserted at
a later time, it will be improperly
biased by the unique magnetic field
characteristics of your plane.
Because our goal is to give the EFIS-D10A a
compass that is accurate in all attitudes, our user
magnetic calibration process is more comprehensive
than that for many other products. The magnetic field
vector in North America is predominantly vertical;
this requires that any complete calibration maneuver
bank the aircraft significantly in order to accurately
map out the unique magnetic signature of your plane
in this three-dimensional field. Therefore, a large
quantity of data needs to be recorded in a variety of
attitudes. Simpler calibration processes do not perform these steps and suffer by being accurate
only at level attitudes. When properly completed, a magnetic calibration of this complexity will
produce a compass that is accurate during banked maneuvers. Note that the EDC-D10A remote
compass calibration process is not as complex because it is assumed that you have mounted it in
a more magnetically clean environment. Three dimensional calibration has already been done on
the EDC-D10A at the factory.
Before proceeding with the calibration, ensure that you have determined and entered the
magnetic inclination (dip angle) as described above.
Performing the calibration
Perform the first portion of the heading calibration on the ground in an area where you can
accurately determine magnetic North such as on a compass rose. You must also have enough
room to perform a 540 turn on the ground as described below. Turn the EFIS-D10A on and let it
warm up for 10-15 minutes before proceeding. Turn all instruments on that you would normally
be operating during a flight, including the engine.
During magnetic calibration, do not turn the power off on the EFIS-D10A. This will cause any
recorded compass calibration data to be lost; the calibration will need to be restarted.
1. Enter the EFIS calibration menu by pressing any button beneath an EFIS page (except the
far left or far right hotkeys), then MORE > SETUP > MORE > MORE > MAGCAL. You
should see a menu that reads GNDNRT, AIRRGT, and AIRLFT. If it reads NORTH,
EAST, SOUTH, and WEST, you have the EDC-D10A installed and should proceed with
the EDC-D10A heading calibration as described on the following page.
2. With the plane in the normal flight state (engine running, all instruments and avionics
on), align the plane to point as close as possible to magnetic North. Press the GNDNRT
button (the button’s text will toggle to DONE – do not press this until the maneuver is
complete) and hold the plane still for 10 seconds. After the 10 seconds of holding still,
maneuver the plane smoothly to the right through 540 degrees of heading change at a rate
of 20 to 30 seconds per 90 degrees of change; the whole maneuver should take between 2
and 3 minutes. At the end of the maneuver, the aircraft will be pointing magnetic South.
At this point, press DONE. If at any time, you make a mistake, press DONE, align the