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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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03/08/21

Message Overview:

Message Name:

NO OUTPUT

Message Code:

B3-006524

Associated CAS:

None

Reporting LRU: DCU 2
System Description: 31-41-00
Schematic Diagram: 31-41-00
Wiring Diagram: 31-41-01
31-41-02
31-41-03
31-41-13

Message Description:

No B-DCU data received at R-IOC AND 2-of (L-PFD, L-MFD, R-PFD, R-MFD, IASC1A, IASC1B, IASC2A, IASC2B, B-LDU, R-RIU).

Possible Causes:

  • Data Concentrator Unit (DCU) (A14)
  • EICAS DCU B Circuit Breaker (CB2-D1)
  • Data Concentrator Unit (DCU) Cooling Fan (A194)
  • Right Cockpit Circuit-Breaker Panel (RCBP) (CBP2)
  • Junction Box 4 (JB4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Box JB4 AMM 24-63-13-000-802
Installation of the Junction Box JB4 AMM 24-63-13-400-802
Replacement of DC Circuit Breakers AMM 24-65-00-960-801
Removal of the Cockpit Circuit-Breaker Panel (CCBP) AMM 24-65-01-000-801
Installation of the Cockpit Circuit-Breaker Panel (CCBP) AMM 24-65-01-400-801
Removal of the Data Concentrator Unit (DCU) AMM 31-41-01-000-802
Installation of the Data Concentrator Unit (DCU) AMM 31-41-01-400-802
Removal of the Data Concentrator Unit (DCU) Tray Fan AMM 31-41-03-000-802
Installation of the Data Concentrator Unit (DCU) Tray Fan AMM 31-41-03-400-802
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset EICAS DCU B Circuit Breaker CB2-D1. Is the fault message still present?

    1. If NO, do close out.
    2. If YES, continue with next step.

  2. Disconnect DCU Tray Fan (A194). Is the fault message still present?

    1. If NO, replace defective DCU Tray Fan.
    2. If YES, continue with next step.

  3. Confirm presence of the Ground at the DCU (A14).

    Measurement at Expected Result Result
    Conn. A14CP1-2J Aircraft Ground (PWR GND)
    Conn. A14CP1-2K Aircraft Ground (PWR GND)
    Conn. A14CP1-7C Aircraft Ground (Chassis GND)
    Conn. A14CP1-7D Aircraft Ground (Chassis GND)
    Conn. A14CP1-7G Aircraft Ground (Chassis GND)
    Conn. A14CP1-7H Aircraft Ground (Chassis GND)

    1. If the check is satisfactory, continue with next step.
    2. If the check is not satisfactory, repair wiring.

  4. Confirm presence of the 28 VDC at the DCU (A14).

    Measurement at Expected Result Result
    Conn. A14CP1-1J Aircraft Ground (PWR GND)
    Conn. A14CP1-1K Aircraft Ground (PWR GND)

    1. If the check is satisfactory, continue with step 7.
    2. If the check is not satisfactory, continue with next step.

  5. Do wiring check between DCU (A14), right Circuit Breaker Panel (CBP2) and DCU Tray Fan (A194), through Junction Box 4, for the following wires:

    From To Result
    Conn. A14CP1-1J CBP2J1-31
    Conn. A14CP1-1K CBP2J1-31
    Conn. A194P2-A CBP2J1-31

    1. If the check is satisfactory, continue with next step.
    2. If the check is not satisfactory, repair defective wire or Junction Box 4.

  6. Replace EICAS DCU B Circuit Breaker CB2-D1. Is the fault message still present?

    1. If NO, do close out.
    2. If NO, replace defective Circuit Breaker Panel.

  7. Replace DCU (A14).
  8. Do close out.

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