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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

04/06/21

Message Overview:

Message Name:

GPS TIMEMARK INVALID

Message Code:

B3-672146

Associated CAS:

None

Reporting LRU: TDR 1
System Description: 34-54-00
Schematic Diagram: 34-54-00
Wiring Diagram: None

Message Description:

GPS Timemark status is reported as invalid by L TDR while L GPS data to L IOC reported as being present. This could be caused by loss of GNSS data from satellites or inputs do not have enough resolution. Possibly no maintenance action may be required.

Possible Causes:

  • Global Positioning Satellite Receiver 1 (GPS) (A25)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Air Traffic Control (ATC) Transponder AMM 34-54-01-000-801
Installation of the Air Traffic Control (ATC) Transponder AMM 34-54-01-400-801
Removal of the Global Positioning Receiver AMM 34-55-01-000-801
Installation of the Global Positioning Receiver AMM 34-55-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. If this fault persists, perform wiring check.

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