Table 4-10 Third-Party Sensor Alert Troubleshooting Guide - Garmin GTN 6 Series Maintenance Manual

4.3.1.8 Third-Party Sensors Related Alerts

Table 4-10 Third-Party Sensor Alert Troubleshooting Guide

Alert Text
DATA SOURCE -
The GTN is configured to
Pressure altitude
receive pressure altitude, but
source inoperative
is not receiving it from any
or connection to
source.
GTN lost.
DATA SOURCE -
Heading source The GTN is configured to
inoperative or receive heading, but is not
connection to receiving it from any source.
GTN lost.
190-01007-B1
Rev. 4
Possible Cause
GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Corrective Action
If the GTN is not expected to receive pressure
altitude, ensure that ALTITUDE SOURCE INPUT
is configured for Not Connected.
Check RS-232 port setting for the port that the
device is connected.
Verify the configuration of the other device.
Verify the GTN RX channel is connected to the
remote device TX channel.
Verify there is only one TX source per RX port.
Check wiring.
If the GTN is not expected to receive heading,
ensure HEADING SOURCE INPUT and
SYNCHRO HEADING INPUT (GTN 7XX only) are
configured for Not Connected.
Check ARINC 429 or RS-232 port setting for the
port connected to the heading source.
Verify the configuration of the heading source.
Check RS-232, ARINC 429, or Synchro (GTN 7XX
only) wiring between the GTN and heading
source.
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