Weather Radar - Garmin GTN Xi Series Maintenance Manual

7.3.6

Weather Radar

Perform the appropriate interface check for the weather radar. No additional GTN Xi configuration steps
are required for replacing a weather radar with an equivalent unit.
7.3.6.1 GWX 68/70/75 Weather Radar Interface Check
This section verifies that the interface between the GTN 7XX Xi and the GWX 68/70/75 weather radar is
functional.
1. Power on the GTN Xi in Normal mode.
2. On the home page, touch the Weather key and then the Radar key.
3. Touch the Mode key and select Standby mode and wait for the warm-up to complete.
4. Touch the Mode key again and select Test mode.
5. Verify that the GWX 68/70/75 begins sweeping and the test pattern is shown.
6. If supported by the installation, verify that stabilization is on ("STAB On" is displayed in the
upper-right corner of the radar display).
7. Touch the Mode key, set the mode to Off.
8. Repeat steps 1 through 7 for the second GTN 7XX Xi, if installed.
7.3.6.2 ARINC 708 Weather Radar Interface Check
This section verifies that the interface between the GTN 7XX Xi and ARINC 708 weather radar is
functional.
WARNING
Aircraft should be outdoors and personnel should not be in front of the weather radar
when it is radiating (i.e., when Weather or Ground mode is selected on the GTN Xi).
1. Power on the GTN Xi in Normal mode. If there are dual GTN 7XX Xi units, power on both in
Normal mode.
2. On each GTN Xi, touch Weather from the home page and then Radar.
3. On GTN Xi #1, touch the Mode key and select Standby Mode and wait for the warm-up to
complete.
4. Touch the Mode key again and select Test Mode.
5. Verify that the radar begins sweeping and the test pattern is shown.
6. If stabilization is supplied to the radar, turn the radar to Weather mode and turn stabilization on in
the weather menu. Verify that "STAB On" is displayed in the upper-right corner or the radar
display. If "STAB INOP" is displayed, verify that stabilization is being supplied to the weather
radar R/T.
7. Touch the Mode key to set the mode to Off.
NOTE
If only one GTN 7XX Xi is installed, the following steps do not have to be carried out.
8. Repeat steps 1 through 7 for GTN Xi #2.
190-01007-C1
Rev. 1
GTN Xi Part 23 AML STC Maintenance Manual
Page 7-20