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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7 Page 7-15
7.4.3.2.2 Two GTNs/One SN3308
1. Remove power from GTN #2 by opening up the circuit breaker.
2. Cycle power to GTN #1 and acknowledge the prompts until it gets to the Instrument Panel Se
lf-
T
est page (see Section
6.1.1).
3. Select GPS1 as the navigation source by pressing the NAV key on the SN3308. Verify that GPS1 is
d
isplayed on the SN3308
.
4. Ensure that the SN3308 is receiving valid heading. The Vertical Deviation Indication will not be
dis
played unless the SN3308 is receiving valid heading.
5. While GTN #1 is displaying the Instrument Panel Self-Test page, verify that the SN3308 is
displaying the following data from GPS1.
Course
Deviation: Half-scale left deviation, TO indication, flag pulled
Vertical Deviation: Half-scale up deviat
ion, flag pulled
Active W
a
ypoint: GARMN
6
. On GTN #1 verify that an OBS value is displayed (and not dashed ou
t).
7. Acknowledge the self test on GTN #1 by touching the Continue key.
8. Select VLOC on GTN #1 and verify that the SN3308 displays NAV 1 or NAV 2 (depending on
which 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. Acknowledge the prompts until th
e
Ins
trument Panel Self-Test page is displayed. See Section 6.1.1. Select GPS2 by pressing the NAV
key on the SN3308.
Repeat steps 5 through 9 with the second GTN.