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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7 Page 7-4
7.1.1 GTN Configuration Steps
7.1.1.1 COM Configuration Page (GTN 635/650/750 Only)
Select the COM Configuration page from the GTN Setup page. These values are set at the factory and
rarely require calibration.
To enable or disable the COM radio, touch the COM key to toggle between enabled and disabled. The
COM radio defaults to the enabled state.
Review the COM configuration settings on the GTN and compare them against the GTN Configuration
and Checkout Log. A copy of the GTN Configuration and Checkout Log form may be found in the
appendices of this document. If any of the settings differ from the checkout log, update the settings to the
correct value. For information regarding individual settings, refer to the GTN 6XX/7XX AML STC
Installation Manual.
7.1.1.2 Enabled Features
Refer to Section 7.5 for instructions on feature enablement. If the configuration module is not replaced, the
enabled features will be retained upon replacing the GTN.
7.1.2 GTN Ground Checks
Ground checks of the GTN require the GTN to be powered up in configuration mode as described in
Section 3.4.
7.1.2.1 Connector Engagement Check
Prior to configuration and checkout of the GTN, the connector engagement should be checked as described
below:
1. Ensure that the GTN GPS/NAV and COM circuit breakers are pulled.
2. Slide the GTN straight into the rack until it stops about 1" short of the fully seated position.
3. Insert a 3/32" hex drive into the unit retention mechanism access hole at the bottom of the unit face
and turn the
tool clockwise while pressing the bezel until the unit is firmly seated in the rack.
4. With the GTN seated, reapply power by closing the circuit breakers and turning on the avionics
ma
ster switch (if installed).
5. Again, insert the hex drive into the unit retention mechanism access hole. Turn the tool counter-
clockwise to back out the retention mechanism. Ensure that three (3) complete revolutions of the
Allen
screw can be performed without red ‘X’ indication or loss of power to the GTN.
NOTE
If power is lost or the red ‘X’ condition occurs with fewer than three (3) turns, ensure there
are no obstructions to the unit fully seating in the rack. Also, the mounting rack may need
to be moved aft (toward the pilot) such that the aircraft panel does not obstruct the unit
from properly engaging in the rack.
6. Pull the circuit breakers to remove power from the unit and re-seat the GTN per step 3.
Close the
breakers to rest
ore power to the unit.