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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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03/19/21

Message Overview:

Message Name:

NO LB-RIU-6 BUS INPUT

Message Code:

B3-006425

Associated CAS:

None

Reporting LRU: CDU 1
System Description: 34-61-00
Schematic Diagram: 34-61-00
Wiring Diagram: 34-61-03

Message Description:

CDU1 is reporting LB-RIU-6 bus inactive, while at least 2 of the following are reporting LB-RIU-6 active; DCU1, MFD1, PFD1.

Possible Causes:

  • Control Display Unit (CDU) (A68)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. LRU = CDU1 CDU 1
  2. ATA Chapter = 34-61
  3. Message# = 15
  4. Comp Id = A068
  5. {Term Definitions}

    1. CDU1-7 1X 350 01 EXCT XXXX-XXXX XXXX-XXXX TXXX-XXXX 350: 16;NO LB-RIU-6 I
    2. DCU1-28 1X 357 01 EXCT XXXX-XXXX TXXX-XXXX XXXX-XXXX 357: 24;LB-RIU-6 BUS INOP
    3. PFD1-35 1X 351 NA EXCT XXXX-XTXX XXXX-XXXX XXXX-XXXX 351: 27;NO LB-RIU-6 INPUT
    4. MFD1-35 1X 351 NA EXCT XXXX-XTXX XXXX-XXXX XXXX-XXXX 351: 27;NO LB-RIU-6 INPUT

Quick Links:

Removal of the Control Display Unit (CDU) AMM 34-61-05-000-801
Installation of the Control Display Unit (CDU) AMM 34-61-05-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Suspect wiring, or the CDU.
  2. Do close out.

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