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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7 Page 7-14
7.4.3.2 Sandel SN3308 Interface Check
If a Sandel EHSI has been connected to the GTN, the interface should be verified as described in one of the
following sections, as appropriate for the installation.
7.4.3.2.1 One GTN/One SN3308
1. Cycle power to the GTN and acknowledge the prompts until it gets to the Instrument Panel Self-
Test page (see Section
6.1.1).
2.
Ensure that the SN3308 is
receiving valid heading.
NOTE
The Vertical Deviation Indication will not be displayed unless the SN3308 is receiving
valid heading.
3. While the GTN is displaying the Instrument Panel Self-Test page, verify that the SN330
8 is
displaying the following data from the GPS source.
Course Deviation: Half-scale left deviation,
TO indication, flag
pulled
V
ertical Deviation: Half-scale up deviation, flag pulled
Active Waypoint:
GARMN
4.
On the GTN verify that an OBS value is displayed (and not dashed ou
t).
5. Acknowledge the self-test on the GTN by touching the Continue key.
6. Select VLOC on the GTN and verify that the SN3308 displays NAV 1 or NAV 2 (depending on
the
GTN n
avigation source configuration)
.
7.
Using a VOR test set verify that the CDI deviation on the SN3308 is displayed correctly
.