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(WARNING)
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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 L-IRS-4 BUS OUTPUT

Message Code:

B3-539911

Associated CAS:

None

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

Message Description:

If SB100-23-22, SATCOM/FANS installation, is incorporated: SVC and SDU are reporting failed L-IRS-4 bus input.

If SB100-23-22, SATCOM/FANS installation, is not incorporated: SVC is reporting a failed L-IRS-4 bus input.

Possible Causes:

  • Inertial Reference Unit (IRU) No. 1 (A233)
  • Junction Box (JB1)
  • Synthetic Vision Computer (SVC) (A230)
  • Satellite Data Unit (SDU) (A82)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the SATCOM Satellite Data Unit (SDU) AMM 23-15-01-000-801
Installation of the SATCOM Satellite Data Unit (SDU) AMM 23-15-01-400-801
Removal of the Junction Box JB1 AMM 24-63-01-000-802
Installation of the Junction Box JB1 AMM 24-63-01-400-802
Removal of the Synthetic Vision Computer (SVC) AMM 34-34-01-000-801
Installation of the Synthetic Vision Computer (SVC) AMM 34-34-01-400-801
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
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

If SB100-23-22, SATCOM/FANS installation, is incorporated:

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

    1. If system checks are good, 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-IRS-4 between IRU 1 connector A233P1, Junction Box #1, SDU connector A82BP1 and SVC connector A230AP1. Repair/replace 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. Replace SVC.

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

  5. Replace SDU.

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

  6. Replace Junction Box #1.
  7. Do close out.

If SB100-23-22, SATCOM/FANS installation, is not incorporated:

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

    1. If system checks are good, 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-IRS-4 between IRU 1 connector A233P1, Junction Box #1 and SVC connector A230AP1. Repair/replace 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. Replace SVC.

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

  5. Replace Junction Box #1.
  6. Do close out.

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