Installation Instructions

GTN 6XX/7XX AML STC Installation Manual 190-01007-A3
Page 5-88 Rev. 4
5.6.10 Air/Fuel Data Interface Check
The GTN can receive fuel and altitude data from an external source. This check verifies that the GTN is
receiving data from these sources. Ensure that the GTN is powered on and in configuration mode. If the
following steps do not perform correctly, check the electrical connections (Appendix E) and configuration
setup (Section 5.5.1.2) for the interfaced data source.
1. Go to the GTN Diagnostics page from the
Configuration Mode Home page.
2. Touch the Main Data Inputs key.
3. If there are multiple sources providing data to the
GTN, remove power from all but one source.
4. Verify that the appropriate data is displayed and
agrees with the active source.
NOTE
After applying power to an altitude source it may take
several minutes to warm up. During the warm-up
period the Pressure Altitude display on the GTN will
be dashed out.
5. If there are multiple sources, remove power from the
currently active source and apply power to another
source that has not been checked.
6. Repeat steps 4 and 5 until all available sources have
been checked.
5.6.11 AHRS/IRU Interface Check
The GTN can receive heading data from an external source.
This check verifies that the GTN is receiving data from these
units. Ensure the GTN is powered on and in configuration
mode. If the following steps do not perform correctly, check the electrical connections and configuration
setup for the interfaced AHRS/IRU.
1. Go to the GTN Diagnostics page from the Configuration Mode Home page.
2. Touch the Main Data Inputs key.
3. Scroll to the Heading data display.
NOTE
If a Sandel EHSI or an ARINC 429 EFIS is also installed, ensure that it is
turned off so that it does not supply heading to the GTN. Verify that the HDG
field displays valid heading data.
4. Remove power from the heading source and verify that the magnetic heading field is dashed out.
Figure 5-54. Main Data
Inputs Page