Page 5-26
GTN 725/750 TSO Installation Manual
Rev. A
190-01007-02
5.6.9 Interface
Checkout
This section describes the checks that must be carried out to verify that systems interfacing to the GTN
are communicating properly. Only those interfaces that are connected to the GTN must be verified.
5.6.9.1
Honeywell (Bendix/King) EFS40/50 Interface Check
If a Honeywell EFS40/50 has been connected to the GTN, the interface should be verified as described in
this section.
1.
Cycle power to the first GTN and acknowledge the prompts until it gets to the self test page (see
Section 5.6.1).
2.
Ensure that GPS1 data is displayed by pressing the “1-2” key on the EFS40/50 control panel.
3.
While the GTN is displaying the self test page, verify that the EFS40/50 is displaying data from
the GPS source. Note that vertical deviation will not be displayed.
•
Course Deviation:
Half-scale left deviation, TO indication, flag pulled
•
Active Waypoint:
GARMN
•
Vertical Deviation:
Half-scale up deviation (only if installation is setup to display
GPS vertical deviation)
4.
On the GTN verify that an OBS value is displayed (and not dashed out).
5.
Using a VOR test set verify that the CDI deviation on the EFS40/50 is displayed correctly.
6.
Cycle power to the second GTN and acknowledge the prompts until it gets to the self test page.
7.
Switch to GPS2 data by pressing the “1-2” key on the EFS40/50 control panel and repeat steps 3
through 5 with the second GTN.
5.6.9.2
Sandel SN 3308 Interface Check
If a Sandel EHSI has been connected to the GTN, the interface should be verified as described in one of
the following sections, as appropriate for the installation.
5.6.9.2.1 One GTN/One SN 3308
1.
Cycle power to the GTN and acknowledge the prompts until it gets to the self test page (see
Section 5.6.1).
2.
Ensure that the SN3308 is receiving valid heading.
NOTE
The Vertical Deviation Indication will not be displayed unless the SN3308 is receiving
valid heading.
3.
While the GTN is displaying the self test page, verify that the SN3308 is displaying the following
data from the GPS source.
•
Course Deviation: Half-scale left deviation, TO indication, flag pulled
•
Vertical Deviation: Half-scale up deviation, flag pulled
•
Active Waypoint: GARMN
4.
On the GTN verify that an OBS value is displayed (and not dashed out).
5.
Acknowledge the self test on the GTN by touching the ‘Continue’ button.
6.
Select VLOC on the GTN and verify that the SN3308 displays NAV 1 or NAV 2 (depending on
what navigation source the GTN is).
7.
Using a VOR test set verify that the CDI deviation on the SN3308 is displayed correctly.
Summary of Contents for GTN 725
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