
Page 5-52 G1000 System Maintenance Manual – Diamond DA40/40F
Revision G 190-00545-01
Table 5-37. COM Alerts (Cont)
Failure Message Cause Solutions
COM2 RMT XFR – COM2 remote
transfer key is stuck.
The COM2 external remote
transfer switch is stuck in the
enabled (or “pressed”) state.
Press the COM2 external remote transfer
switch again to cycle its operation.
Check COM2 external remote transfer
switch and wiring.
Switch GIA1 and GIA2, to identify
whether the unit or connectors/wiring is
at fault (Both GIAs must be configured
when swapped, see Section 3.5):
9 If problem follows the unit,
replace GIA2.
9 If problem persists, continue to
troubleshoot remote transfer
switch & wiring.
COM1 TEMP – COM1 over temp.
Reducing transmitter power.
The COM transceiver is
reporting a high temperature
condition and is reducing
transmit power to prevent
damage.
Check avionics cooling fans for proper
operation. Verify that cooling air can flow
freely into and out of the remote avionics
box.
9 If problem persists, replace
overheating GIA.
COM2 TEMP – COM2 over temp.
Reducing transmitter power.
5.10.2 NAV Alerts
Table 5-38. NAV Alerts
Failure Message
Cause Solution
NAV1 SERVICE – NAV1 needs
service. Return unit for repair.
The system has detected a failure
in NAV1 receiver.
Replace GIA1.
NAV2 SERVICE – NAV2 needs
service. Return unit for repair.
The system has detected a failure
in NAV2 receiver.
Replace GIA2.
NAV1 RMT XFR – NAV1 remote
transfer key is stuck.
The NAV1 external remote
transfer switch is stuck in the
enabled (or “pressed”) state.
Press the NAV1 external remote transfer
switch again to cycle its operation.
Check NAV1 remote transfer switch and
wiring.
Switch GIA1 and GIA2, to identify whether
the unit or connectors/wiring is at fault (Both
GIAs must be configured when swapped, see
Section 3.5):
9 If problem follows unit, replace
GIA1.
9 If problem persists, continue to
troubleshoot remote transfer switch
& wiring.
NAV2 RMT XFR – NAV2 remote
transfer key is stuck.
The NAV2 external remote
transfer switch is stuck in the
enabled (or “pressed”) state.
Press the NAV2 external remote transfer
switch again to cycle its operation.
Check NAV2 remote transfer switch and
wiring.
Switch GIA1 and GIA2, to identify whether
the unit or connectors/wiring is at fault (Both
GIAs must be configured when swapped, see
Section 3.5):
9 If problem follows unit, replace
GIA1.
9 If problem persists, continue to
troubleshoot remote transfer switch
& wiring.
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