Installation Instructions

GTN 6XX/7XX AML STC Installation Manual 190-01007-A3
Page 5-102 Rev. 4
5.7.8.7 EHSI Deviation Scaling for HSI/CDI Driven by GTN via ARINC 429 Data
If the GTN 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 and acknowledge the prompts until it gets to the Instrument Panel Self-
Test page (see Section 5.7.1).
2. With the Instrument Panel Self-Test page displayed on the GTN, 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, look on the EHSI/EFIS and
verify that the vertical deviation is half-scale up and not flagged.
NOTE
If the deviations are not as described, the EHSI/EFIS does not scale the GTN deviations
properly and this installation cannot be certified for GPS-based guidance. Contact
Garmin for further assistance
5.7.8.8 ARINC 429 Traffic System Interface Check
If a Garmin GTS 8XX Traffic system, L-3 Communications SKY497/SKY899 Skywatch sensor or a
Honeywell (Bendix/King) KTA 810 TAS/KMH 820 IHAS has been connected to the GTN via ARINC
429, the traffic interface should be verified as described in this section.
1. Go to the Traffic page on the GTN from the home page.
2. Verify that NO DATA is not displayed in yellow on the center of the traffic page.
3. If the GTN is configured to control the traffic system (Section 5.5.1.8), verify that the traffic
system mode can be changed from STBY to OPER.
4. Switch the traffic system mode to STBY, and then run the traffic self test from the Menu.
5. Verify that the traffic system executes a self test and that a self-test pattern is displayed on the
GTN traffic display.
6. Restart the GTN in Configuration Mode.
7. On the Traffic page in the External Systems page group, verify that there is data displayed in the
Altitude field.
5.7.8.9 Stormscope Interface Check
If an L-3 Communications WX-500 Stormscope has been connected to the GTN, the Stormscope
interface should be verified as described in this section.
1. Go to the Lightning page on the GTN.
2. Verify that ‘STORMSCOPE FAILED’ is not displayed in yellow on the center of the Lightning
page.
3. Verify that the Stormscope mode can be changed from Strike to Cell, and vice versa.