Instruction Manual

500W Series 190-01226-03 Rev. 2
Instructions for Continued Airworthiness Bell 206B Page 15 of 22
Alert Text Possible Cause Solution
• GPS antenna cable is shorted • Verify that the center
conductor is not shorted to
the braid in the coaxial
cable.
GPS is not responding –
check GPS antenna (main
software version 3.20 and
later).
• Internal system-to-system
communication between the
main processor and the GPS
receiver has failed.
Operational status of the GPS
receiver is unknown.
• Contact Garmin technical
support.
GPS needs service
• The 500W Series unit has
detected a failure in its GPS
receiver.
• Contact Garmin technical
support.
Large magnetic variance
• A valid value of magnetic
variation is not available for
this location.
• Verify all course angles
• Contact Garmin technical
support.
• Improper antenna installation
or coax routing
• Check GPS antenna
installation, connections,
and cable routing. The
GPS antenna must be
mounted on the top of the
aircraft.
• Antenna shaded from satellites • Make sure the aircraft is
clear of hangars,
buildings, trees, etc.
Loss of integrity — cross-
check NAV
• RF interference at 1575.42
MHz from VHF COM.
• Move GPS antenna
further from the COM
antenna. Add a 1575.42
MHz notch filter in COM
coax. Fix or replace the
COM. Disconnect the
ELT antenna coax to
check for possible re-
radiation.
Low Battery - Unit Needs
Service
• Time data may have been lost
due to a memory battery
failure.
• Replace the battery (refer
to Section 8.4).
MAIN processor requires
service
• The 500W Series unit has
detected a failure in the main
system processor.
• Contact Garmin technical
support.
No altitude input is being
received
• No altitude data is being
received from RS-232
(Serializer: Icarus, Rosetta or
Shadin) or grey code inputs.
• Refer to Table 6-1
“RS-232 device is not
communicating with the
GPS 500W/GNS530W”.
No basemap data available
• The 500W Series unit has
detected a failure in the built-in
basemap (land data) memory.
Land data does not appear on
the Map Page. Other unit
functions continue to work
normally.
• Contact Garmin technical
support to reload the
basemap data.