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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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03/23/21

Message Overview:

Message Name:

NO L-GPS-3 BUS INPUT

Message Code:

B3-006984

Associated CAS:

None

Reporting LRU: IRS 1
System Description: 34-45-00
Schematic Diagram: 34-45-00
Wiring Diagram: 34-45-01
34-45-05
34-45-13

Message Description:

L-GPS-3 input to IRS 1 is inactive, while L-GPS-3 input to IRS 2 is reported active.

Possible Causes:

  • Internal Reference Unit (IRU) No. 1 (A233)
  • Configuration Connector (J2001)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Inertial Reference Unit (IRU) AMM 31-45-01-000-801
Installation of the Inertial Reference Unit (IRU) AMM 31-45-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset IRU 1 (CB1-C2) circuit breaker.

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

  2. Swap IRUs.

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

  3. Do wiring check of the ARINC 429 data bus L-GPS-3 from IRU 1 connector A233P1 to configuration connector J2001. Repair/replace as required.

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

  4. Repair/replace configuration connector J2001.
  5. Do close out.

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