GTR 225/GNC 255 TSO Installation Manual
190-01182-02
Page 6-14
Rev. B
6.5.2 Flags Check (GNC Only)
The Flags test sends an active signal for each selected flag so you can test the interface to the connected
devices directly from the front panel while you are on the ground. The Flag tests include NAV (NAV), GS
(Glideslope), and T/F (To/From). The Test Analog Flag page (Figure 6-24) can be found in the NAV
group (Figure 6-1).
NOTE
Some CDIs/HSIs require that the ILS ENERGIZE discrete be active for flags check and
CDI/VDI check to function properly.
Figure 6-24. Test Analog Flags Page
1. Select the Test Analog Flags page. Press
ENT
.
2. Turn the large outer knob to change the flag selection. Turn the small knob to select valid or
invalid. Check the connected indicator for the appropriate flag.
3. Turn the large knob to the next flag type and turn the small knob to change it to valid or invalid.
You can only select From, To, or Hidden as active, not at the same time.
4. Ensure the flags on the connected indicator function as intended.
6.5.3 VOR/Localizer/Glideslope Indicator (GNC Only)
The Test CDI/VDI page (Figure 6-25) of the NAV group, allows the analog indicator connected to the
GNC to be checked for proper wiring and operation.
Figure 6-25. Test CDI/VDI Page
If the GNC is interfaced to an analog indicator, perform the following steps:
1. Select the Test Analog CDI/VDI page and press
ENT
. Rotate the larger outer knob to select
between CDI and VDI.
2. On the CDI selection, verify correct operation of the lateral deviations on the indicator by using
the corresponding selections (Max Left, Full Left, Centered, Full Right, Max Right).
3. On the VDI selection, verify correct operation of the vertical deviations on the indicator by using
the corresponding selections (Max Up, Full Up, Centered, Full Down, Max Down).
Summary of Contents for GNC 255
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