Page 6-10
GTN 625/635/650 TSO Installation Manual
Rev. C
190-01004-02
6.6.5
Main Indicator (Analog) Configuration Page
Access the Main Indicator (Analog)
Configuration page, as shown in Figure 6-8, by
touching the ‗Main Indicator (Analog)‘ key on
the GTN Setup page. This page allows you to
calibrate the OBS resolver, enable the CDI key,
selected course for GPS and/or VOR/LOC, and
configure the V-Flag state. The following fields
can be configured:
CALIBRATE OBS RESOLVER
To calibrate the OBS resolver, touch the
‗Calibrate‘ key from the Main CDI Configuration
page. Next, select 150˚ on the OBS, then touch
the ‗OK‘ key, as prompted on the display. After
the OBS resolver is finished calibrating, the GTN
will display ‗OBS Resolver Calibration
Complete‘. Touch ‗OK‘ after the calibration is
complete. Verify OBS operation by checking that
the course displayed on the GTN is within 2° of
the selected course.
CDI KEY
If it is desired to disable the CDI key, touch the key to the right of ‗CDI Key‘ to toggle between enabling
and disabling the CDI key. Disabling the CDI key removes the CDI key from the screen and sets the
CDI/VDI outputs always to GPS. This may be necessary for certain EFIS systems where navigation
sensor selection must be accomplished on the EFIS or its control panel.
SELECTED COURSE FOR GPS
If it is desired to ignore a selected course input for GPS operation in OBS mode, touch the key to the right
of ‗Selected Course for GPS‘ until ‗Ignored‘ is displayed on the key.
SELECTED COURSE FOR VOR/LOC
If it is desired to ignore a selected course input such that the VOR valid flag is dependent only on a valid
VOR signal, with lateral deviation calculated by another display device, touch the key to the right of
‗Selected Course for VLOC‘ until ‗Ignored‘ is displayed on the key.
V-FLAG STATE
Select either Normal or Declutter for the V-Flag State by touching the key until the desired selection is
displayed on the key.
Selection
Description
Declutter
Whenever vertical deviation is invalid, the vertical deviation bar is
parked in the maximum UP position and the vertical flag is removed
from view, except in the following cases: (i) the CDI is in VLOC mode
and an ILS frequency is tuned, or (ii) the CDI is in GPS mode and a
GPS approach with vertical guidance is active. In these cases,
whenever the vertical deviation is invalid, the vertical deviation bar
parks in the centered position and the vertical flag is shown.
Normal
Whenever vertical deviation is invalid the vertical deviation bar parks in
the centered position and the vertical flag is shown.
Figure 6-8. Main Indicator (Analog)
Configuration Page
