Altitude Test; Compass Test - Garmin MX20 Installation Manual

Installation
2.9.3.3 Test with MX20
While performing the following tests, observe the MX20, external GPS navigation source (signal
reception), and the system under test for interference or abnormal operation.
1. Turn on power to the MX20.
2. Turn on the power to each avionics system. Observe for proper operation of the MX20 and the
other avionics systems.
____ Transponder (if equipped)
____ NAV/VOR/ILS unit and tune to a local frequency (VOR/DME)
____ Any other navigation source
____ Radio Altimeter
____ DME
____ ADF
____ VHF Comm Transceiver
____ Encoding Altimeter
____ Flight Director
____ Marker Beacon Receiver
____ Weather Radar
____ Ground Proximity Warning System or Enhanced Ground Proximity Warning System
(EGPWS)
____ Autopilot
____ Directional Gyro/HSI
____ RMI
____ TIS-A Sensor
____ GDL 69/69A Data Link Sensor
____ WSI InFlight Weather Sensor
____ TAWS Sensor
____ Traffic Sensor

2.9.4 Altitude Test

1. Perform the installation and calibration tests in accordance with the altitude source manufacturer's
installation manual.
2. Perform a flight check against the aircraft altimeter. Verify readings at ground level and at three
additional altitude points.
3. The altitude will be displayed on the bottom right-hand corner of the MFD terrain page, if the
terrain function is enabled.

2.9.5 Compass Test

If the MX20 is located within seven inches of any compass, the compass will require a compass
calibration.
36 560-1025-09 Rev E MX20 Installation Manual