Garmin GNS 480 Installation Manual page 114

Post-Installation Configuration & Checkout
5. If installed, set the RMI select switch to the Nav position. Tune a local VOR station, or use a
simulated signal from an approved VOR Test System.
6. Verify that the RMI needle swings and points towards the VOR station.
3.3.2.4.11 DME
The GNS 480 can channel a DME based upon the tuned VOR frequency. This check verifies that the
GNS 480 is properly tuning the DME. If the following steps do not perform correctly, check the
electrical connections and configuration setup.
1. Tune a co-located VOR/DME station. Listen to the DME ident via the audio panel and ID the station
to verify that it is correct.
2. Tune an invalid VOR station. Verify that the DME changes to an invalid station.
3.3.2.4.12 Skywatch
The GNS 480 can display traffic from a Skywatch system, and can optionally provide the user interface
to control the Skywatch system. This check verifies that the GNS 480 is properly receiving traffic data
and (if applicable) controlling the Skywatch operating modes. If the following steps do not perform
correctly, check the electrical connections and configuration setup.
1. On the GNS 480 go to the traffic page. This page is accessed by pressing the FN key repeatedly until
the TFC smart key is displayed. The TFC smart key is then pressed to display the traffic page.
2. Verify that 'Data Fail' is not displayed and the Skywatch operating mode is displayed in the upper
right hand corner.
The following steps need to be completed only if the GNX 480 is providing the user
interface to the Skywatch. The Skywatch weight-on-wheels switch must indicate 'on
ground' in order for the following checks to be completed.
3. Press the MENU/ENTER key to display the line select key functions and press the STBY / OPER
line select key. Verify that pressing the STBY / OPER line select key toggles the Skywatch mode
between STBY and OPER.
4. Ensure that the Skywatch is in Standby, and press the TEST line select key. Verify that 'Self Test in
Progress' is displayed and the Skywatch test pattern is displayed on the traffic page.
For dual GNS 480 installations, this check must be performed for each GNS 480 that is
configured to display traffic. Both GNS 480 units can be on while this check is carried
out on each unit.
3.3.2.4.13 CO Guardian
The GNS 480 can receive carbon monoxide level from an external sensor. This check verifies that the
GNS 480 is receiving data from these units. Ensure that the GNS 480 and carbon monoxide sensor are
turned on and in normal mode. If the following steps do not perform correctly, check the electrical
connections and configuration setup.
For dual GNS 480 installations, this check must be performed for each GNS 480 that is
receiving information from the carbon monoxide sensor.
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NOTE
NOTE
NOTE
560-0982-01 Rev A GNS 480 (CNX80) Installation Manual