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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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04/01/21

Message Overview:

Message Name:

NO R-GPS-3 BUS OUTPUT

Message Code:

B3-633781

Associated CAS:

None

Reporting LRU: GPS 2
System Description: 34-55-00
Schematic Diagram: 34-55-00
Wiring Diagram: 34-55-01
34-55-03

Message Description:

R-GPS-3 input to R IRS and L IRS is reported inactive.

Possible Causes:

  • Global Positioning Receiver 2 (GPS) (A24)
  • Config Connector (J2000)
  • Inertial Reference Unit 1 (IRU) (A233)
  • Inertial Reference Unit 2 (IRU) (A232)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Inertial Reference Unit (IRU) AMM 34-45-01-000-801
Installation of the Inertial Reference Unit (IRU) AMM 34-45-01-400-801
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. Reset R GPS (CB2-A3) circuit breaker.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  2. Swap GPSs.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  3. Dowiring check of the ARINC 429 data bus R-GPS-3 form GPS 2 connector A24BP1, through J2000 config connector, to IRU 1 connector A233P1 and to IRU 2 connector A232P1. Replace/repair as required.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.
      NOTE: An internal short of any LRUs connected to this data bus might cause this failure.

  4. Swap IRUs.
  5. Do close out.

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