Installation Instructions

190-01007-A3 GTN 6XX/7XX AML STC Installation Manual
Rev. 4 Page 5-109
Table 5-65. Marker Beacon Annunciator Light Duration
Groundspeed (Knots)
Light Time (seconds)
2000 ft 3000 ft
90 13 20
110 11 16
130 9 14
150 8 12
If the marker beacon annunciator lights do not remain illuminated for the required time, adjust the marker
beacon low sensitivity threshold as described in Section 5.5.4.8.2.5, and then repeat steps 1 and 2.
5.9 Database Check
Check the navigation database to ensure it is current. The database information is displayed during the
unit display start-up sequence. To check the database:
1. Cycle power on the GTN. The GTN will go through its normal start-up sequence.
2. Wait for the Database Verification page to be displayed.
3. Verify that the expiration dates displayed have not passed for each database.
4. The database expiration date can also be viewed in the System Status page which is accessed
from the System page in normal mode. If the database has expired, then remove and replace the
navigation database card and see Section 1.8.