Garmin GTN 6XX System Maintenance Manual page 120

7.5.1.1 TAWS System Check
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 the 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.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 7-24
190-01007-A1
Rev. 5