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

6.3 Connector Engagement Check

Check the connector engagement prior to configuration and checkout of the GTR/GNC.
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. Do not 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:
1. Remove power from the GTR/GNC.
2. Press and hold the ENT key.
3. Apply power to the GTR/GNC by turning the COM volume knob.
4. When "Garmin" appears on the screen release the ENT key.
The first page displayed is the CONFIG MODE page. In configuration mode there are five configuration
groups. The five groups, SYS, NAV, COM, AUD, and LOG each have pages. The outer knob is used to
access the groups. The inner knob is used to access the pages of the groups. The ENT key is used to
confirm the selection of page.
190-01182-02
Rev. F

Figure 6-1 Configuration Mode Page

GTR 225/GNC 255 TSO Installation Manual
Page 6-2