Installation Instructions

GTN 6XX/7XX AML STC Installation Manual 190-01007-A3
Page 5-96 Rev. 4
5.7.7 TAWS System Check (For Units with TAWS Only)
While on the ground, turn on the GTN following normal power-up procedures. Also turn on the audio
panel.
NOTE
A 3D GPS position fix is required to conduct this check.
1. Select the Terrain page from the normal mode Home page.
2. Touch the MENU key.
3. Touch the Test TAWS key.
4. Wait until the TAWS self-test completes (10-15 seconds) to hear the TAWS system status aural
message.
• The aural message “TAWS System Test OK” will be annunciated if the TAWS system is
functioning properly.
• The aural message “TAWS System Failure” will be annunciated if the TAWS system is NOT
functioning properly. Also, ‘TAWS FAIL’ will appear in amber on the screen.
If no audio message is heard, then a fault exists within the audio system or associated wiring and the
TAWS capability must be considered non-functional. Verify the TAWS audio wiring to the audio panel.
5.7.8 Interface Checks
5.7.8.1 Weather Radar Interface Check
5.7.8.1.1 GWX 68/70 Weather Radar Interface Check
This section verifies that the heading interface between the GTN 7XX and the GWX 68/70 weather radar
is functional.
1. Start the GTN in normal mode.
2. On the Home page, touch Weather and then Radar.
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 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. Using the Mode key, set the mode to Off
8. Repeat steps 2 through 7 for the second GTN 7XX (if installed).
5.7.8.1.2 ARINC 708 Weather Radar Interface Check
This section verifies that the interface between the GTN 7XX and ARINC 708 weather radar is
functional.
1. Start the GTN in normal mode. If there are dual GTN 7XXs, start both in normal mode.
2. On each GTN 7XX, go to the Home page, touch Weather and then Radar.
3. On one GTN, touch the Mode key and select Standby mode and wait for the warmup to
complete.
4. Touch the Mode key again and select Test mode.