Garmin GTN Xi Series, Maintenance Manual

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190-01007-C1 GTN Xi Part 23 AML STC Maintenance Manual
Rev. 1 Page 7-16
7.3.3.3 Sandel SN3500/4500 Interface Check
If a Sandel SN3500/4500 EHSI has been connected to the GTN Xi, the interface should be verified as
described in this section.
1. Cycle power to the GTN Xi and acknowledge the prompts until on the Instrument Panel Self-Test
page (refer to Section 6.1.1).
2. Ensure that the SN3500/4500 receives valid heading. The Vertical Deviation Indication will not
display unless the SN3500/4500 is receiving valid heading.
3. While the GTN Xi displays the Instrument Panel Self-Test page, verify that the SN3500/4500
displays data from the GPS source:

Course Deviation: Half-scale left deviation, TO indication, flag pulled

Vertical Deviation: Half-scale up deviation, flag pulled

Active Waypoint: GARMN
4. On the GTN Xi, verify that an OBS value displays and is not dashed out.
5. Acknowledge the self-test on the GTN Xi by touching the
Continue key.
6. Select VLOC on the GTN Xi and verify that the SN3500/4500 displays “NAV 1” or “NAV 2”
depending on which navigation source the GTN xi is.
7. Ensure that the NAV1 (or NAV2) indication does not have a red line through it.
8. Repeat steps 3 through 7 for GTN Xi #2, if installed.
7.3.3.4 EHSI Deviation Scaling for HSI/CDI Driven by GTN through ARINC 429 Data
If the GTN Xi has a serial connection to an EFIS display, proper scaling of the EFIS CDI and VDI must be
verified.
1. Cycle power to the GTN Xi and acknowledge the prompts until on the Instrument Panel Self-Test
page (refer to Section 6.1.1).
2. With the
Instrument Panel Self-Test
page displayed on the GTN Xi, look on the EHSI/EFIS and
verify that the lateral deviation is half-scale left and not flagged.
3. With the Instrument Panel Self-Test page displayed on the GTN Xi, look on the EHSI/EFIS and
verify that the vertical deviation is half-scale up and not flagged.
7.3.3.5 GMX200/MX20 Interface Check
The Garmin GMX 200 or MX20 interface should be verified as described in this section.
1. Ensure that the GTN Xi has a 3-D position fix.
2. Create and activate a flight plan on the GTN Xi by touching the
Direct-To key and entering a
waypoint.
3. Verify that the RTE and POS data flags does not display on the GMX 200/MX20.
4. Verify that the flight plan displays on the GMX 200/MX20 using the flight plan (FPL) function.