Instruction manual

400W Series 190-01226-04 Rev. 2
Instructions for Continued Airworthiness Bell 206B Page 15 of 22
Alert Text Possible Cause Solution
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 400W 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 400W 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
400W/GNS430W”.
No basemap data available
• The 400W 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.
Not receiving input data on
429 Channel #1 or #2
• No data has been received on
the ARINC 429 channel #1
connection for a period
exceeding five seconds.
• Refer to Table 6-1 “ARINC 429
device is not receiving data
from the GPS
400W/GNC420W/GNS430W”