Garmin GTN 725 Installation Manual page 103

5.6.9.2.2 Two GTNs/One SN3308
The checkout for two GTNs also applies to one GTN 6XX and one GTN 7XX.
1. Remove power from GTN #2.
2. Cycle power to the 1st GTN and acknowledge the prompts until it gets to the self test page (see
Section 5.6.1).
3. Select GPS1 as the navigation source by pressing the NAV key on the SN3308.
4. Ensure that the SN3308 is receiving valid heading.
The Vertical Deviation Indication will not be displayed unless the SN3308 is receiving
valid heading.
5. While GTN #1 is displaying the self test page, verify that the SN3308 is displaying the following
data from GPS1.
Course Deviation:
Vertical Deviation:
Active Waypoint:
6. On GTN #1 verify that an OBS value is displayed (and not dashed out).
7. Acknowledge the self test on GTN #1 by touching the 'Continue' button.
8. Select VLOC on GTN #1 and verify that the SN3308 displays NAV 1 or NAV 2 (depending on
what navigation source the GTN is).
9. Using a VOR test set verify that the CDI deviation on the SN3308 is displayed correctly.
10. Remove power from GTN #1 and apply power to GTN #2 and acknowledge the prompts until it
gets to the self test page (see Section 5.6.1).
11. Select GPS2 by pressing the NAV key on the SN3308.
12. Repeat steps 4-9 with the second GTN.
5.6.9.3 Sandel SN3500/4500 Interface Check
If a Sandel SN3500/4500 EHSI has been connected to the GTN, the interface should be verified as
described in this section.
1. Cycle power to the GTN and acknowledge the prompts until it gets to the self test page (see
Section 5.6.1).
2. Ensure that the SN3500/4500 is receiving valid heading.
The Vertical Deviation Indication will not be displayed unless the SN3500 is receiving
valid heading.
3. While the GTN is displaying the self test page, verify that the SN3500/4500 is displaying data
from the GPS source.
Course Deviation:
Vertical Deviation:
Active Waypoint:
GTN 725/750 TSO Installation Manual
190-01007-02
NOTE
Half-scale left deviation, TO indication, flag pulled
Half-scale up deviation, flag pulled
GARMN
NOTE
Half-scale left deviation, TO indication, flag pulled
Half-scale up deviation, flag pulled
GARMN
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