Installation Manual

Lynx NGT-9000
Installation Manual
0040-17001-01 (Revision W) Maintenance Page 4-22
Table 4-3: Troubleshooting The Remote Mount NGT-9000R
SYMPTOMS CAUSE / CORRECTIVE ACTIONS
• CP-2500 displays no message
for first 2 minutes, then displays
"GPS-INIT" indefinitely until a
GPS position is acquired.
• ADS-B Out Fail lamp is Off for 2
minutes and then flashes (1
second On/Off) indefinitely until
a GPS position is acquired.
• Compatible displays may
indicate “STANDBY” or "DATA-
FAIL" and WI-FI information is
not available.
GPS is Acquiring (On Ground – no previous position fix).
1. The GPS may need up to 4 minutes 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 MPC (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 ACSS Field Service before removal of unit.
• CP-2500 displays "GPS-INIT"
for first 2 minutes and then
changes to “ADS-B System Fail”
and “GPS Fail” indefinitely until a
GPS position is acquired.
• ADS-B Out Fail lamp flashes (1
second On/Off) for 2 minutes,
and then remains ON indefinitely
until a GPS position is acquired.
GPS is Acquiring (In Air – no previous position fix).
1. The GPS may need up to 4 minutes 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. Cycle power to the unit.
4. Contact ACSS Field Service before removal of unit.
• CP-2500 displays "GPS-INIT"
for 2 minutes, and then displays
“ADS-B System Fail” and “GPS
Fail”.
• ADS-B Out Fail lamp is Flashing
(1 second On/Off) for 2 minutes
and then remains ON.
• Compatible displays may indicate
“STANDBY” or "DATA-FAIL" and
WI-FI information is not available.
GPS-Acquiring (previous position fix - On Ground or In Air) 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. If inside a hangar, verify GPS repeater is operational and is
within line of site of the aircraft GPS antenna.
3. Verify correct wiring of the GPS antenna. Verify that the
GPS and L-band antenna cables are not swapped.
4. Observe the GPS Receiver Information using the MPC
(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.
5. Remove the GPS antenna connector from the Unit, and
verify that approx +12 VDC is available at the center pin of
the GPS connector of the Unit.
6. Remove power from other broadcasting equipment and
wait 2 minutes for the GPS to acquire a signal.
7. Replacement of the Unit may be required. Contact ACSS
Field Service before removal of the unit.