Garmin MX20 Installation Manual - page 40
Installation
MX20 Installation Manual
33
8. Demo Mode must be disabled for all aircraft installations.
9. If the GDL 90 UAT is installed, select Disp/Ctrl or Disp Only for theGDL 90 UAT Radio setting.
The Disp Only setting should be selected when another device controls the GDL 90 UAT.
10. If the GDL 90 UAT is installed and you want to allow entering/editing the GDL 90 transponder
squawk code, select Enabled. The squawk code is accessed from one of the Menu selections in
Traffic mode. If the aircraft has an operating transponder, the GDL 90 Code Edit option must be
disabled.
11. Enter GDL 69 cable loss. Refer to the GDL 69/69A Installation Manual (Garmin P/N 190-00355-02).
12. Enter in antenna gain. Refer to the GDL 69/69A Installation Manual (Garmin P/N 190-00355-02).
13. Enter the Radar Indicator number. This number should match the port number of the radar that the
MX20’s ARINC 429 control lines are connected. The ALL option is not recommended when there
are multiple radar control/display devices being used.
14. Press Enter/Menu to confirm all settings.
15. After the 30-second waiting period, turn the MX20 power off to apply all configuration settings.
NOTE
MX20 power must be cycled before configuration changes will take effect. After a configuration
change, a message will appear on the screen telling you to wait 30 seconds before turning off
power. You may continue to make configuration changes without pausing; however, do not turn
off power to the MX20 until waiting 30 seconds after the last configuration/ setting change. The
message will disappear when it is safe to cycle power.
2.8 Configuring the KMH 820 IHAS for the MX20
Figure 2-18 shows the connections between the MX20 display and the KMH 820 IHAS. To work properly
with the MX20, the KMH 820 IHAS must be configured as described below.
The EGPWS function of the KMH 820 IHAS must be configured as follows:
- Category 4: Terrain Display ID = 4
- Category 5: I/O Discrete ID = 1
- Category 9: Terrain Display Popup ID = 0
The remainder of the EGPWS configuration items are installation-specific and consequently not specified.
Refer to the KMH 820 Installation Manual for configuration instructions.
NOTE: The MX20 will automatically range to 10nmi if a terrain pop-up occurs.
NOTE: With Terrain Display ID 4 the peaks data will be embedded in the terrain sweep.
For the TAS functions of the KMH 820 IHAS, the configuration module should be strapped as follows:
- Controller type: Discrete
- Display Valid: Ignore
The remainder of the TAS configuration items are installation-specific and consequently not specified. Refer
to the KMH 820 Installation Manual for configuration instructions.