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Revision A5
HXr Installation Manual GRT Avionics
SECTION 4: CHECK OUT & CALIBRATION
4.1 Display Unit Check Out
1. Apply power to the display unit. The LCD may flicker, and within 10 seconds, the display should
show the first page.
2. If multiple power buses connect to the display unit, apply power from each bus individually
to test.
4.2 AHRS/Air Data Computer Test
1. Verify that the serial ports to all AHRS units have been programmed into the EFIS. (Refer to
the HXr Setup Guide for instructions to program serial ports.)
2. Apply power to display unit with internal AHRS.
3. Proper operation of the AHRS and magnetometer is indicated as follows:
a. The display unit shows altitude and airspeed tapes.
b. Attitude and heading data appears on the screen at the completion of the alignment period
(typically less than 2 minutes).
c. No "ATTITUDE FAIL" message is shown on the PFD screen.
d. No failure messages are listed on the EFIS screen (check lower left corner for MSG box).
4. Press “MORE” softkey, then “SET MENU.” Select the “AHRS Maintenance” page.
5. Verify AHRS communications status is valid, and AHRS status is OK. Verify the AHRS is receiving
serial communications from the display unit by observing that no data fields are grayed out.
Verifying Magnetometer Wiring
The magnetometer can be verified to be wired correctly and operating when the PFD screen
indicates the heading reference is valid (not dashes) and is identified as “HDG”.
Troubleshooting
Since the EFIS will automatically detect and configure the serial port for the magnetometer, this
Setting page can be reveiwed to see if the EFIS detected serial data from the magnetometer at
some point. If it did, one of the serial ports will be configured as a magnetometer, and if serial data
is being received, the serial data counter will be incrementing rapidly.