Avidyne 700-00182-XXX and 700-00179-XXX
Instructions for Continued Airworthiness
Confidential property of Avidyne Corporation
AVIFD-315
Not to be disclosed without permission
Revision: 08, Date: 01/18/17
Page 15 of 15
6. Troubleshooting Information
Refer to the manufacturers’ installation and user’s manuals to assist in
troubleshooting. The following items present common installation
problems and recommended actions for the Avidyne IFD5XX/IFD4XX
System.
Component
Trouble
Probable Cause
Solution
GPS
The IFD5XX/IFD4XX is not
computing a position
Aircraft is not positioned in a
location to receive GPS satellites
Move aircraft to a better location
GPS Antenna System
Check Antenna coaxial cables for
proper assembly
Check or replace the GPS
antenna
The GPS Signal Levels drop
when avionics are turned on.
Noise interference from other
avionics
Turn off all avionics off, then turn
on each piece one at time to
isolate the interference to the
The GPS signal levels are very
low.
Antenna
Verify the GPS antenna is
connected to the correct antenna
Repair or Replace antenna
Antenna shaded from satellites
Move aircraft to a better location
Interference from avionics
Re-route GPS antenna system
away from sources of interference.
Interference from a VHF
Communication transmitter
Move GPS antenna away from the
VHF Communication antenna or
install a 1575.22 MHz notch filter.
VHF
Communication
VHF Communication transceiver
is not transmitting
The PTT input is not being
grounded
Check PTT input to the
IFD5XX/IFD4XX
VHF Communication transceiver
power is low
VSWR too high
Check VSWR is less than 3:1
Coaxial Cable
Repair or replace coaxial cable
Antenna
Repair or Replace VHF Com
antenna
Navigation
Receiver
VHF Navigation Receiver not
receiving VOR/LOC station
VHF Navigation station not tuned
correctly.
Tune the IFD5XX/IFD4XX to the
correct station
Antenna
Repair or Replace Antenna
Diplexer
Repair or Replace Diplexer
Coaxial Cables
Repair or Replace Cable
Attitude
Reference
System (ARS)
(IFD545/550)
The pitch ladder and horizon are
replaced with Red X
ARS Failure
Replace IFD
RMI pointer
RMI not displaying indicating
Wiring
Check wiring
