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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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02/25/21

Message Overview:

Message Name:

NO R-DCPC-1 BUS TO RDC

Message Code:

B3-007846

Associated CAS:

None

Reporting LRU: R PROTECTION PCB
System Description: 24-61-00
31-41-00
Schematic Diagram: 24-61-00
Wiring Diagram: 24-61-01
24-62-03

Message Description:

No R-DCPC output bus data to RDC.

Possible Causes:

  • Right DC Power-Center Protection (RPROT) (PCB2)
  • Remote Data Concentrator (RDC) (A13)
  • Right Power Center (DCPC) (A36)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the DC Power Center (DCPC) AMM 24-61-01-000-801
Installation of the DC Power Center (DCPC) AMM 24-61-01-400-801
Functional Test of the DC Power Center (DCPC) AMM 24-61-01-720-801
Removal of the DC Power-Center Protection AMM 24-61-77-000-801
Installation of the DC Power-Center Protection AMM 24-61-77-400-801
Removal of the Remote Data Concentrator (RDC) AMM 31-41-05-000-802
Installation of the Remote Data Concentrator (RDC) AMM 31-41-05-400-802
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Swap the Right DC Power-Center Protection (PCB2) with the Left DC Power-Center Protection (PCB1). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace the defective DC Power-Center Protection.

  2. Do wiring check of the following wires:

    From
    		 To
    		 Results
    RDC conn. A13EP1 - pin 2A R DCPC conn. A36P2 - pin L
    RDC conn. A13EP1 - pin 2B R DCPC conn. A36P2 - pin M

    1. If wiring check is satisfying, continue with next step.
    2. If wiring check is not satisfying, repair the defective wire.

  3. Replace Remote Data Concentrator (A13). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace the defective Remote Data Concentrator.

  4. Replace Right DC Power Center (A36).
  5. Do close out.

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