Garmin GNC 420AW, Installation Manual

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400W Series Installation Manual Page 5-33
190-00356-02 Rev. G
5.5.6.2.2 Two 400W Series Units/One SN3308
The checkout for two 400W Series units also applies to one 400W Series unit and one 500W Series unit.
1. Remove power from the second (no. 2) 400W Series unit.
2. Cycle power to the first GNS 400W Series unit and acknowledge the prompts until it gets to the
self test page (see Section 5.5.1).
3. Select GPS1 as the navigation source by pressing the NAV key on the SN3308.
4. Ensure that the SN3308 is receiving valid heading.
NOTE
The Vertical Deviation Indication will not be displayed unless the SN3308 is receiving valid
heading.
5. While the first GNS 400W Series unit is displaying the 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 deviation, flag pulled
•
Active Waypoint: GARMN
6. On the first GNS 400W Series unit verify that an OBS value is displayed (and not dashed out).
7. Acknowledge the self test on the first GNS 400W Series unit by pressing the ENT key.
8. Select VLOC on the first GNS 400W Series unit and verify that the SN3308 displays NAV 1 or
NAV 2 (depending on what navigation source the GNS 430W is).
9. Using a VOR test set verify that the CDI deviation on the SN3308 is displayed correctly.
10. Remove power to the first 400W Series unit and apply power to the second 400W Series unit and
acknowledge the prompts until it gets to the self test page (see Section 5.5.1).
11. Select GPS2 by pressing the NAV key on the SN3308.
12. Repeat steps 4-9 with the second GNS 400W Series unit.