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Most popular questions for - A2 ADAHRS
ATTENTION:  Make sure to properly calibrate attitude before proceeding with Compass Calibration.
the magnetometer calibration data is invalidated after every attitude calibration procedure (full attitude calibration and horizon alignment).

The Compass Calibration procedure must be executed in-flight and requires to steer the aircraft in 4 directions and execute some pitch up/down maneuvers. The total duration for this procedure is about 4 minutes.


Press MENU > TOOLS > EFIS > Compass Calibration.
The screen switches to Primary Flight Display mode, where a flight director (a magenta frame) shows the maneuvers to perform. Follow the magenta frame until the procedure is finished.
Assuming that the calibration is started with the aircraft heading North, the steps required are:

1.  Maintaining heading 000° execute: pitch up + 20°, back to straight flight and then pitch down -20°

2. Turn left to heading 270° by performing a standard rate turn (the proper bank will be shown by the flight director). The target heading for each step is shown as a magenta reference inside the heading tape.

3. Execute pitch up/down maneuvers as described in step #1

4. Repeat steps #2 and #3 for headings 180° and 090°, until reaching again the original heading.

5. At the end of a successful calibration procedures the compass instruments is enabled (i.e. red cross removed) and the HSI instrument correctly shows AHRS as data source, meaning that magnetic compass data are now available to the EFIS system.

Note: it’s not required to start the procedure heading north. Any starting direction is acceptable.
Note: If the calibration fails or the compass indicator is not enabled, repeat the calibration procedure. If several calibration attempts fails review the installation location of the A2. Magnetic disturbance could be too high in the selected area.



The small and light weighted ADAHRS module easily fits into the aircraft as it can be installed in any orientation (a proper calibration procedure must be performed). It is suggested to install the A2 aligned with the aircraft longitudinal axis, as it simplifies the attitude calibration process.

The right position should be:
- Near the pitot and static lines
-  In a location clear of strong magnetic or electromagnetic disturbances as much as possible.
- Avoid installing the A2 ADAHRS near electronic equipment (other digital EFIS, radios, transponders, etc), AC or variable DC cables, alternators, electrical motors, ferrous materials, etc. In such cases the proper behavior of the compass is not guaranteed (i.e.
the compass may be crossed as “out of order” or may give erroneous indications).

Hint: Use a hand-held compass to verify the magnetic disturbance in the area selected for installation. If the needle shows relevant changes or unstable indication, the location is not suitable for installation. Make sure to perform this test with all on-board electronic devices switched ON.



Scenario A.

No calibration needed.






Scenario B.
A2 ADAHRS  is aligned with the aircraft longitudinal axis, is not aligned with straight & level flight attitude but pitch and roll offsets are present: a Horizon Alignment procedure is required.






Scenario C.
A2 ADAHRS is not aligned with aircraft longitudinal axis,
nor with straight & level flight attitude:
Full Attitude Calibration procedure is required.
 


Horizon Alignment
Press MENU > STRUMENTI > EFIS > Horizon Alignment.
1. Make sure the aircraft is in straight and level flight attitude
2. Press the joystick to record a sample of pitch and roll angles



Full Attitude Calibration
Press MENU > STRUMENTI > EFIS > Full Attitude Calibration.

1. Select if the maneuver will be pitch up or down. For tricycle aircraft the pitch up maneuver can be performed by pushing the tail (pitch up), while tail draggers will execute a pitch down maneuver by raising the tail.

2. Reset A2 ADAHRS calibration data; select Start. Wait until the reset phase is completed.

3. Set the aircraft in level and straight flight attitude by using jacks or blocks (or by asking a friend to push or lift the tail and hold). Press ENTER (joystick click) to record the sample in level & straight flight.

4. Set the aircraft in a pitch up (or down) attitude and press ENTER to record the pitch up/down sample. WARNING: be very careful not to change the aircraft heading while performing the pitch up /down maneuver.

5. Set values to A2 by pressing ENTER. Wait a few minutes for the sensor to stabilize and realign. If pitch and roll after a few minutes are still not aligned fine-tune pitch and roll offset by executing a Horizon Alignment procedure.

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AvMap navigators are guaranteed for 2 years after  the purchase date.