Connector Engagement Check; Configuration Mode Operations; Figure 6-1. Configuration Mode Home Page - Garmin GTR 225 Installation Manual

6.3 Connector Engagement Check

Prior to configuration and checkout of the GTR/GNC, the connector engagement should be checked as
described below:
1. Turn on the avionics master switch (if installed).
2. Place the GTR/GNC in the rack and engage the cam mechanism.
3. Turn the Allen screw of the locking cam (located on the lower left side of the unit) slowly
clockwise until the GTR/GNC just powers on. A T-handle can be used for this, but ensure that the
screw is not over-tightened.
4. Count the number of complete revolutions the Allen screw can be turned until it cannot turn any
more. Take care not to over-tighten. Three turns is the minimum for proper installation. If fewer
than three turns are possible, the mounting rack should be moved aft (toward the pilot) such that
the aircraft panel does not obstruct the unit from properly engaging in the rack.

6.4 Configuration Mode Operations

The configuration pages shown in this section reflect main software version 2.00. Some differences in
operation may be observed when comparing the information in this manual to later software versions.
Configuration mode is used to configure the GTR/GNC settings for each specific installation. To access
configuration mode, remove power from the GTR/GNC. With the GTR/GNC turned off, press and hold
the ENT key and apply power to the GTR/GNC by turning the COM volume knob clockwise. Release the
ENT key when the display activates and 'Garmin' appears on the screen.
The first page displayed is the Config Mode page. While in configuration mode, pages can be selected by
turning the outer knob to select the high-level page, turning the inner knob to select the subpage, and then
pressing the ENT key to select the desired page. There are five main page headings: SYS, NAV, COM,
AUD, and LOG. From the main heading, turn the inner knob to select the desired subpage and then press
the ENT key. See Figure 6-1.
GTR 225/GNC 255 TSO Installation Manual
Page 6-2

Figure 6-1. Configuration Mode Home Page

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