Lynx NGT-9000s
Installation Manual
Table 4-1: Troubleshooting
SYMPTOM
SCREEN CAUSE/CORRECTIVE ACTIONS
•
No data on the weather
display.
•
ADS-B Out Fail lamp is OFF.
Weather The FIS-B data is not being transmitted to the weather
display.
Note: NEXRAD data is only transmitted every 5 minutes.
CONUS data is only transmitted every 15 minutes.
1. No ground station is in range.
2. The ground station may not provide FIS-B service.
•
Display indicator
INITIALIZING (white text)
showing on FIS-B
application screen.
•
ADS-B Out Fail lamp is
Flashing at a slow rate (1
sec On and 1 sec Off).
Flashing last only 2 minutes
before the lamp stays ON.
•
A compatible weather
display may have the
message “NO DATA”
showing.
Weather The indication is shown on the weather map indicating that
GPS is Acquiring (On Ground – no previous position fix).
1. This is a normal condition. It continues to be shown
until internal operations have completed. The GPS
requires approximately 60 to 90 seconds to provide a
position after power is applied to the unit.
2. The GPS signal may be weak. Move the aircraft into an
area where the unit can acquire the GPS signal.
3. Make sure nothing is covering or blocking the GPS
antenna.
4. Cycle power to the unit.
5. Check System Status Messages.
6. Check the Lynx MAT fault log.
7. Check that GPS Antenna Short pin doesn’t get
grounded.
8. Observe the GPS Receiver Information MPC (Service –
GPS) for correct signal strength (C/No) of the GPS
satellites. This has a range from 30 dB to 50 dB. If this
is not the case, then check if the antenna cable loss is
more than 10 dB.
9. Check if 12V power is available at GPS antenna port,
when the unit is powered on.
10. Contact L-3 Field Service before removal of unit.
•
Display indicator MAP FAIL
(red text) showing on FIS-B
application screen.
•
ADS-B Out Fail lamp is
Flashing at a slow rate (1
sec On and 1 sec Off).
•
A compatible weather
display may have the
message “NO DATA”
showing.
Weather GPS-Acquiring (On Ground or In Air– previous position fix)
This means only GPS data is not available however, the
GPS position was available once during this power ON or it
is shown when a fault is detected that prevents the FIS-B
data from showing on the screen.
1. The GPS signal may be weak. Move the aircraft into an
area where the unit can reacquire the GPS signal.
2. Cycle power to the unit.
3. Possible problem with L-Band antenna or internal
hardware.
4. Check System Status Messages.
5. Check the Lynx MAT fault log.
6. Observe the GPS Receiver Information using the Lynx
MAT (Service – GPS) for correct signal strength. Verify
that the signal bars are showing at least 40 -50% in the
GPS Receiver Information Packet. If this is not the
case, then check if the antenna cable loss is more than
10 dB.
7. Check if 12V power is available at GPS antenna port,
when the unit is powered ON.
8. Contact L-3 Field Service before removal of unit.
Page 4-8
Maintenance
0040-17001-01
January 15, 2015
Revision A
