190-01004-02
GTN 625/635/650 TSO Installation Manual
Rev. F
Page 6-55
6.10.8
GAD 42 Interface Check
This check verifies that the GTN is interfaced with
the GAD 42.
1. Access the GAD 42 Configuration page, as
shown in Figure 6-56, by touching the ‘GAD
42’ key on the External Systems page.
2. Verify that Status is ACTIVE.
3. Change any of the options to a different num-
ber.
4. Verify that after changing one of the options
the STATUS field changes to SENDING
then changes back to ACTIVE. If the entry reverts to the previous number when ACTIVE is dis-
played, then refer to the latest revision of the GAD 42 Installation Manual (P/N 190-00159-00).
6.10.9
Lighting Bus Interface Check
CAUTION
When 14 VDC or 28 VDC lighting buses are connected to the GTN, connection of the
aircraft lighting bus to the incorrect input pins can cause damage to the GTN. Always
start this test with the dimming bus at the lowest setting, and slowly increase the
brightness. If it is noticed that the LIGHTING level displayed on the GTN does not
increase as the lighting is increased in brightness, verify that the wiring is correct before
proceeding.
The display and key backlighting on the GTN can track an external lighting/dimmer bus input and use it to
vary the display and key backlight levels accordingly. This check verifies that the interface is connected
correctly.
1. Access the Lighting Configuration page, as
shown in Figure 6-57, by touching the ‘Light-
ing’ key on the GTN Setup page. For installa-
tions using the Enhanced Lighting
Configuration, touch ‘Day Mode Operation’
after touching the ‘Lighting’ key. Ensure the
Day/Night switch is in the ‘Day’ position (if
installed).
2. Touch the Source key to change the source to
Lighting Bus 1 or 2.
3. Touch the Minimum Level key to set the
lighting bus to its minimum setting of 0.14%.
4. Slowly vary the lighting bus level that is con-
nected to the GTN. Verify that the Source Input Level value displayed on the configuration screen
tracks the lighting bus setting. Continue to maximum brightness and verify proper operation.
Figure 6-56. GAD 42 Configuration Page
Figure 6-57. Lighting Configuration Page
Summary of Contents for GTN 625
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