Garmin GPS 400W Installation Manual page 120

5.5.6.11.1 Main OBI Output
If the Main OBI output from the 400W Series unit is connected to an RMI navigation indicator verify the
interface as follows:
1. Apply power to the equipment and wait for the 400W Series unit to acquire a position.
2. In the 400W Series unit, set a course to a destination waypoint and ensure GPS is selected for
display on the CDI.
3. If installed, set the RMI select switch to the GPS position.
4. Verify that the RMI needle swings and points towards the GPS waypoint selected.
5. If the Main OBI Output is configured to ―Track CDI,‖ ensure that a valid VOR station is not
tuned. Select VLOC on the CDI and verify that the RMI needle is parked at the invalid position.
6. If the Main OBI Output is configured to output ―Always GPS,‖ select VLOC on the CDI and
verify that the RMI needle still points towards the GPS waypoint selected.
5.5.6.11.2 VOR OBI Output (GNS 430W Only)
If the VOR OBI output from the 430W is connected to an RMI navigation indicator verify the interface
as follows:
1. Apply power to the equipment.
2. If installed, set the RMI select switch to the VLOC position.
3. Tune a local VOR station, or use a simulated signal from an approved VOR Test System.
4. Verify that the RMI needle swings and points towards the VOR station.
5.5.6.12 DME Tuning Check (GNS 430W Only)
If the 430W is set up to remotely channel a DME, verify the interface as follows:
1. Select a VOR/ILS channel that corresponds to (1) a DME station within a 40 nautical mile range,
or (2) the frequency of a DME ground tester.
2. Verify that the DME locks on to the signal and a valid distance, ground speed and time are
displayed.
3. Tune an invalid VOR station. Verify that the DME changes to an invalid station.
5.5.6.13 GDU 620 (G500/G600) Interface Check
The 400W Series unit can receive data from the GDU 620. Verify the interface as part of the
GDU 620 installation checkout procedure.
5.5.6.14 GDL 88 Interface Check
If a Garmin GDL 88 has been connected to the GNS 400W Series unit, the traffic interface should be
verified as described in this section.
1. Go to the Traffic page on the GNS 400W Series unit (in the NAV page group).
2. Verify that NO DATA is not displayed in yellow on the center of the traffic page.
3. Verify that the traffic system mode can be changed from STBY to OPER.
4. Switch the traffic system mode to STBY, and then run a traffic self test from the Menu.
5. Verify that the GDL 88 executes a self test and a self test pattern is displayed on the GNS 400W
Series unit.
Page 5-42
Rev. G
GNS 400W Series Installation Manual
190-00356-08