Installation Manual

Lynx NGT-9000
Installation Manual
0040-17001-01 (Revision W) Maintenance Page 4-23
Table 4-3: Troubleshooting The Remote Mount NGT-9000R
SYMPTOMS CAUSE / CORRECTIVE ACTIONS
• CP-2500 - Normal operation.
• Lamps - Normal operation.
• Traffic (STIF) displays continues
to show "DATA-FAIL" even
though no ADS-B Out Fail lamp
or message is indicated.
Display is not receiving 429 STIF data. Normal operation is that
"DATA-FAIL" is displayed until GPS is acquired, and then the
STIF display should indicate Standby mode.
1. Verify DCM and display are configured for STIF traffic only
(not set to both, i.e. not set to DTIF or Both) and the correct
speed. The Unit emulates L3 Avionics System SKY497
format. This is a high speed 429 bus. Consult display
manufacturer's installation manual for proper set-up
procedures.
2. Replacement of the Unit may be required. Contact ACSS
Field Service before removal of the unit.
• CP-2500 - Normal operation.
• Lamps - Normal operation.
• Traffic symbols on the Traffic
display are open diamonds and
not directional traffic
(arrowheads or triangles).
This is normal for all STIF displays. Directional symbology can
only be displayed on a DTIF display.
1. The traffic display does not support the DTIF format
necessary to show directional data provided by ADS-B.
2. The directional information that is being received by the
Unit does not have directional data. The Unit continues to
transmit non-directional data to the traffic display.
The four digit squawk code is
missing from the “ALT” and “ON”
screen of the CP-2500. NOTE: Code
appears OK in “STB” mode.
This is an indication that the Lynx NGT-9000R has failed and
may also be seen if the aircraft is in the hanger with no GPS
signal for > 2 minutes.
1. Move the aircraft into an area with access to a GPS signal.
2. Cycle power to the Lynx MSS.
3. Replacement of the Lynx MSS or system component may
be required. Contact ACSS Field Service before removal of
the unit.
• XPDR FAIL is displayed on the
CP-2500.
• The CP-2500 altitude page
displays "INVLD PA".
• Baro Altitude (Pressure altitude)
is not being transmitted as
indicated by the IFR-6000 in
Monitor mode.
• Geometric altitude is being
transmitted from the Unit, and all
other information is available.
• Lamps - Normal operation.
• Display/PED – Altitude
information is shown as dashes.
Either the Unit is not receiving BARO-ALT (Pressure altitude), or
the control panel is set to ON mode.
1. Verify that the CP-2500 is set to ALT Mode.
2. Verify that the Unit is receiving BARO-ALT (Pressure
altitude). On the CP-2500 go to the Altitude page. The page
should display the altitude for example as: 800PA (for 800 ft
pressure altitude). In the case of missing altitude, it displays
"INVLD PA". Pressure altitude is a required output for FAA
compliance. In the event of the loss of Pressure altitude,
the UAT device continues to operate by reverting to GPS
altitude as a back-up. The GPS altitude can be viewed with
the MAT device.
NOTE
Some altitude encoders can take 1-3 minutes to
output data after initial power on.