GTN 725/750 TSO Installation Manual
Page 5-17
190-01007-02
Rev. A
5.5
Ground Checks (Configuration Mode)
The following checks are done in Configuration Mode. For instructions concerning entering
Configuration Mode, see Section 5.4.
5.5.1
Main Indicator Check (Analog Only)
NOTE
If the GTN is interfaced to an electronic HSI and the main indicator analog output is not
used, this check is not required.
If the GTN is interfaced to an analog indicator on the main
CDI/OBS, perform the following steps:
1.
Go to the GTN Diagnostics page. See Figure 5-17.
2.
Go to the Main Indicator (Analog) page.
3.
Verify correct operation of the lateral deviation, flag
and TO/FROM flag using the corresponding
selections.
4.
Verify correct operation of the vertical deviation
and flag using the corresponding selections.
5.
Verify correct operation of the OBS knob using the
SELECTED COURSE display. At 30° increments
around the OBS card, ensure that the indicated
value is within 2° of the value set on the indicator.
If the resolver is not within 2°, calibrate the resolver
as described in Section 5.4.4.
5.5.2
VOR/ILS Indicator (Analog)
If the GTN is interfaced to an analog indicator on the VOR/ILS Indicator output, perform the following
steps:
1.
Go to the GTN Diagnostics page. See Figure 5-17.
2.
Go to the NAV page.
3.
Verify correct operation of the lateral deviation, flag and TO/FROM flag using the corresponding
selections.
4.
Verify correct operation of the vertical deviation and flag using the corresponding selections.
5.5.3
Discrete Inputs Checkout
If the GTN is connected to external switches, perform the following steps:
1.
Go to the GTN Diagnostics page. See Figure 5-17.
2.
Go to the Discrete Inputs page.
3.
For each external switch that is connected, exercise the switch and check the ‘active’ or ‘inactive’
indication on the screen correlating to the appropriate switch input, and ensure it is displayed
correctly.
Figure 5-17. GTN Diagnostics Page
Summary of Contents for GTN 725
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