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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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03/24/21

Message Overview:

Message Name:

NO L-IRS-2 BUS INPUT

Message Code:

B3-007176

Associated CAS:

None

Reporting LRU: MFD 1
System Description: 31-61-00
34-45-00
Schematic Diagram: 31-61-00
34-45-00
Wiring Diagram: 31-61-03
34-45-01

Message Description:

L-IRS-2 bus data absent at MFD 1 and NOT absent at PFD 1.

Possible Causes:

  • Junction Box 1 (JB1)
  • Adaptive Flight-Display Unit (MFD) (A29)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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 Adaptive Flight-Display Unit AMM 31-61-01-000-801
Installation of the Adaptive Flight-Display Unit AMM 31-61-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset L MFD (CB1-C5) and L MFD HTR (CB3-F7) circuit breakers.

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

  2. Swap AFDs.

    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-2 from MFD 1 connector A29P1 to Junction Box #1. connector JB1AP1 or respective Test Points. Repair/replace as required.

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

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

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