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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7 Page 7-13
7.4.2 Serial Tuned DME
7.4.2.1 Serial Tuned DME Configuration
Under the VOR/LOC/GS configuration page, set the DME mode and DME Channel Mode to the values
specified in the Configuration Checkout Log. Configuration of these settings is required if exchanging
GTN 650/750 units, but is not required if replacing a DME with an equivalent unit.
7.4.2.2 Interface Check (650/750 Only)
Verify the interface performing the following steps:
1. Select a VOR/ILS channel that corresponds to (1) a DME station within a 40 nautical mile range,
or (2) the frequency of a DME ground tester.
2. Verify that the DME locks on to the signal and a valid distance is displayed.
3. Tune an invalid VOR station. Verify that the DME data is flagged.
4. If multiple GTNs are set up to remotely channel a DME, repeat steps 1-3 using the other GTN.
7.4.3 Displays
Perform the appropriate interface check for the replaced EHSI, EFIS, PFD, or MFD. No additional
configuration on the GTN is required when replacing a display with an equivalent unit.
7.4.3.1 Honeywell (Bendix/King) EFS 40/50 Interface Check
If a Honeywell EFS 40/50 has been connected to the GTN, the interface should be verified as described in
this section.
1. Cycle power to the first GTN and acknowledge the prompts until it gets to the Instrument Panel
Self-Test page (see Section 6.1.1)
2. Ensure that GPS1 data is displayed by pressing the 1-2 key on the EFS 40/50 control panel.
3. While the GTN is displaying the Instrument Panel Self-Test page, verify that the EFS 40/50 is
displaying data from the GPS source.
Course Deviation: Half-scale left deviation, TO indication, flag pulled
Active Waypoint: GARMN
Vertical Deviation: Half-scale up deviation (only if installation is setup to display GPS vertical
deviation)
4.
On the GTN verify that an OBS value is d
isplayed (and not dashed out).
5. Using a VOR test set verify that the CDI deviation on the EFS 40/50 is displayed correctly.
6. Cycle power to the second GTN and acknowledge the prompts until it gets to the Instrument Panel
Self-Test page.
7. If a second GTN is installed, switch to GPS2 data by pressing the 1-2 key on the EFS 40/50 control
panel and repeat steps 3 through 5 with the second GTN.