Garmin 420 Guida Utente

GNS 430 Pilot’s Guide and Reference

13-2

  Cannot navigate locked FPL - The pilot has 

attempted to navigate a flight plan (FPL) with 
one or more locked waypoints.  A waypoint can 
be ‘locked’ when the NavData card is replaced 
and the waypoint(s) does not exist in the new 
database.

  Can’t change an active waypoint - An attempt 

has been made to modify the position of the active 
‘to’ or ‘from’ waypoint.  The GNS 430 does not 
allow modifications to user waypoints currently 
being utilized for navigation guidance.

  Can’t delete an active or FPL waypoint - An 

attempt has been made to delete the active ‘to’ or 
‘from’ waypoint.  The GNS 430 will not allow the 
deletion of user waypoints currently being utilized 
for navigation guidance.

  CDI key stuck - The CDI Key is stuck in the 

enabled (or pressed) state.  Try pressing the CDI 
Key again to cycle its operation.  If the message 
persists, contact a Garmin dealer for assistance.

  Check unit cooling - The GNS 430 has detected 

excessive display backlighting temperature.  The 
backlighting has been automatically dimmed 
to reduce the temperature.  Check for adequate 
ventilation or check cooling air flow.  Contact a 
Garmin dealer for assistance.

  COM has failed - The GNS 430 has detected a 

failure in its communications transceiver.  The 
COM transceiver is not available and the unit 
should be returned to a Garmin dealer for service.

  COM is not responding - Internal system-

to-system communication between the main 
processor and the COM transceiver has failed.  
Operational status of the COM transceiver is 
unknown and the unit should be returned to a 
Garmin dealer for service.

  COM needs service - The GNS 430 has detected 

a failure in its communications transceiver.  The 
COM transceiver may still be usable, but the unit 
should be returned (at the earliest convenience) to 
a Garmin dealer for service.

  COM push-to-talk key stuck - The external 

push-to-talk (PTT) switch is stuck in the enabled 
(or pressed) state.  Try pressing the PTT switch 
again to cycle its operation.  If the message 
persists, contact a Garmin dealer for assistance.

  COM remote transfer key is stuck - The 

remote COM transfer switch is stuck in the 
enabled (or pressed) state.  Try pressing the 
switch again to cycle its operation.  If the message 
persists, contact a Garmin dealer for assistance.

  COM transfer key stuck - The COM Flip-flop 

Key is stuck in the enabled (or pressed) state.  Try 
pressing the COM Flip-flop Key again to cycle 
its operation.  If the message persists, contact a 
Garmin dealer for assistance.

  COM transmitter power has been reduced 

- The GNS 430 has detected excessive unit 
temperature and/or an insufficient voltage level.  
The COM transceiver transmit power has been 
automatically reduced to compensate for the 
condition.  For excessive temperatures, check for 
adequate ventilation or check cooling air flow. If 
the message persists, contact a Garmin dealer for 
assistance.

  Data card failure - The GNS 430 has detected 

a problem with the NavData card.  The data is 
not usable and the card should be returned to 
Jeppesen or a Garmin dealer.