Garmin GTN 6 series Maintenance Manual - page 78
GTN 6XX/7XX Part 27 AML STC Maintenance Manual
190-01007-B1
Page 6-14
Rev. 1
6.4.1.1
HTAWS System Check
While on the ground, apply power to the GTN and audio panel following normal power-up procedures.
NOTE
A 3D GPS position fix is required to conduct the check.
1. Select the Terrain page from the normal mode Home page.
2. Touch the Menu key.
3. Touch the Test HTAWS key.
4. Verify that all external HTAWS annunciators (if installed) light up. If any of the annunciators do
not light up, then verify that the discrete output is configured properly. If the discrete output is
configured properly, then the fault exists within the annunciator or the wiring.
5. Wait until the HTAWS self-test completes (10-15 seconds) to hear the HTAWS system status
aural message.
◦
The aural message “HTAWS System Test OK” will be annunciated if the HTAWS system is
functioning properly.
◦
The aural message “HTAWS System Failure” will be annunciated if the HTAWS system is
NOT functioning properly. Also, “HTAWS 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
HTAWS capability must be considered non-functional. Verify the HTAWS audio wiring to the audio
panel.