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AvMap
Ultra EFIS
knob for 5 seconds and release it.
Push again the rotor knob, select CALIBRATE to enter the Calibration menu and select
HORIZON to enter the HORIZON menu.
In the Horizon menu select ZERO to calibrate the AHRS. Now the Horizon line of the Ultra
EFIS is aligned with the aircrafts straight & level flight attitude.
IMPORTANT: If after the first attempt the horizon is not alligned with the aircrafts straight &
level flight attitude, execute the horizon calibration again but before executing the calibration
first restore the Horizon to DEFAULT in the Horizon menu.
IMPORTANT: If you want to restore AHRS calibration to the factory default (scenario A),
select DEFAULT in the Horizon Menu.
3.2 Magnetometer (compass) calibration
The purpose of this procedure is to compensate magnetic disturbances the Ultra EFIS
is subject to, due to aircraft metal structures and electromagnetic components. These
disturbances, if not compensated, could alter the heading value provided by the system.
For this reason the magnetometer is disabled before the Magnetometer Calibration procedure
is executed.
The procedure requires to point the aircraft nose in 4 directions (North, East, South and West
oriented to Magnetic North) . The total duration for this procedure is about 20 minutes.
IMPORTANT: When the magnetometer of the Ultra EFIS is not enabled the Ultra EFIS
uses GPS source to show COG (course over ground) on the compass. To enable compass
heading it is neccessary to calibrate the magnetometer. In case both GPS and Magnetometer
sources are lost the compass becomes RED and is out of order.
IMPORTANT: Before you proceed with the magnetometer (compass) calibration, make
sure that the horizon line of the Ultra EFIS is aligned with the aircrafts straight & level flight
attitude (see paragraph 3.1)
IMPORTANT:
The Compass Calibration procedure must be executed in an open field
clean of magnetic disturbances (we recommend at the compass rose of your airport).
Note: Most airports have a compass rose, which is a series of lines marked out on a ramp
or maintenance run up area where there is no magnetic interference. Lines, oriented to
magnetic north, are painted every 30° which is used to perform a compass calibration.
Magnetometer (Compass) Calibration procedure:
STEP 1: Prepare aircraft position and system
Taxi the aircraft to the airports compass rose or an open field free from magnetic
disturbances.
Have the aircraft nose pointed to the Magnetic NORTH (0°) radial on the Airport Compass
User and Installation Manual -
11
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