Installation Manual

Lynx NGT-9000
Installation Manual
0040-17001-01 (Revision W) Maintenance Page 4-12
4.4.2 System Status Messages
The system status messages are seen on the panel mount Lynx NGT-9000 during either start up or when
the System Test button is pressed. The typical meanings of the messages are detailed in the bullets below.
Use the information in
Table 4-2 to help determine cause and corrective actions.
• A “Fail” message is caused by something internal to the unit.
• An “External Fail” message is caused by a problem with the external equipment input signals. The
unit continues to attempt to acquire the signal without rebooting. These messages automatically clear
once communications have been restored to the external equipment.
• A “Degraded” message indicates a function has limited capability due to an internal failure.
• An “External Degraded” message indicates a function has limited capability due to an external
failure.
• A “Coverage” or “No Signal” message indicates that no signal is being received from a ground
station.
Attempt to clear fail or degraded messages by cycling power to the unit. View the message list and use
the MPC (MAT) to access the configuration and fault logs to isolate this issue.
The Continue button is active whenever a failure or degraded window message is shown. It may be used
to begin normal operation with degraded performance.
The unit continues to operate non-fatal failures detected during the System Test by providing any
functionality unaffected by the failures. If one or more of the secondary faults are detected, then the unit
displays the "Service Unit Soon" as part of the message. (That information is recorded in the maintenance
log, but is not displayed. These faults do not directly affect the operation and function of the NGT-9000.)
Tap the MSG button located on the Transponder Application screen to view fail messages during normal
operation. The MSG button blinks when new messages have been received and have not yet been viewed.
When all the faults are cleared, the MSG button is removed from the screen.
Table 4-2: System Status Messages
SYMPTOM CAUSE/CORRECTIVE ACTIONS
ADS-B In – External Degraded
ATAS – External Degraded (if ATAS
enabled)
The message is seen due to the following failure(s):
• ARINC 429 AHRS Input
• Altimeter – Gillham Altitude Input
• Altimeter – RS-232 Input
• Altimeter – ARINC 429 Input
1. Cycle power to the unit to try clearing the failure.
2. If the problem continues check, the interface devices
listed above for possible errors.
3. If the problem continues, replacement or the listed input
device may be required. Contact ACSS Field Service
before removal.