Garmin International Inc 0181200 Manuel D’Utilisation
190-01277-00
GRA 5500 Installation Manual
Revision A
Page A-3
Table A-3 identifies the various unit faults that can be encountered during normal operation of the GRA 5500. Use Table A-3 as a reference to
determine the proper actions to take after a fault has been identified.
determine the proper actions to take after a fault has been identified.
Table A-3 GRA 5500 Fault Descriptions
Fault Type
Fault Name
Description
Cause
Resolution
Configuration
N/A
Unit does not boot
GRA HW Revision ID
invalid for SW version
invalid for SW version
Update software to correct version for hardware
GRA Unit ID invalid
(Both discrete inputs
grounded)
(Both discrete inputs
grounded)
Check Unit ID strapping and set to a valid ID
Hardware failure
Return unit to Garmin for service
Calibration
Zero-Foot Lock
Average frequency of
zero-foot signal is
larger/smaller than
allowable
frequencies
zero-foot signal is
larger/smaller than
allowable
frequencies
Improper antenna
connections
connections
Check antenna installation and all cable
connections and retry calibration. Note there are no
assert log entries for this fault.
connections and retry calibration. Note there are no
assert log entries for this fault.
Antenna cables are
too long or calibration
completed while
aircraft is in air
too long or calibration
completed while
aircraft is in air
Calibrate unit while on ground. Note there are no
assert log entries for this fault.
assert log entries for this fault.
Zero-Foot Cal
Zero-foot point not
set
set
Calibration not
complete
complete
Calibrate the unit. Note there are no assert log
entries for this fault.
entries for this fault.
POST (Power On
Self-Test)
Self-Test)
PLL Register
After programming,
read-back of the PLL
register values does
not match what was
sent from the CPU
read-back of the PLL
register values does
not match what was
sent from the CPU
Internal
communication error
communication error
Cycle power to unit. If fault persists, return unit to
Garmin for service.
Garmin for service.
RF Self-Test
The self-test signal is
not within the
acceptable frequency
range
not within the
acceptable frequency
range
Improper antenna
connections
connections
Check antenna installation and all cable
connections
connections
Internal failure
Download the assert log and send to Garmin for
diagnosis. If fault persists, return unit to Garmin for
service.
diagnosis. If fault persists, return unit to Garmin for
service.
Sensor Boot
Sensor processor
software not
successfully loaded
software not
successfully loaded
Internal
communication error
communication error
Cycle power to unit. If fault persists, return unit to
Garmin for service.
Garmin for service.
Various
(see
(see
)
Numerous tests
identified in this table
are run during Power
On Self-Test (POST).
Failure of these tests
is identified as a
POST fault during
power up and also
identified by the fault
name in the fault log.
identified in this table
are run during Power
On Self-Test (POST).
Failure of these tests
is identified as a
POST fault during
power up and also
identified by the fault
name in the fault log.
Various
(see
(see
Cycle power to unit. If fault persists, return unit to
Garmin for service.
Garmin for service.
(continued on next page)
DRAFT