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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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03/10/21

Message Overview:

Message Name:

NO RDC CH B OUTPUT

Message Code:

B3-007693

Associated CAS:

None

Reporting LRU: RDC A&B
System Description: 31-41-00
Schematic Diagram: 31-41-00
Wiring Diagram: 31-41-01
31-41-02
31-41-11
31-41-13

Message Description:

Remote Data Concentrator (RDC) channel B buses are reported inoperative by Data Concentrator Unit (DCU) channel A and B.

Possible Causes:

  • Remote Data Concentrator (RDC) (A13)
  • EICAS RDC B Circuit Breaker (CB2-D2)
  • Right Circuit Breaker Control Panel (CBP2)
  • Junction Box 3 (JB3)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Box JB3 AMM 24-63-09-000-802
Installation of the Junction Box JB3 AMM 24-63-09-400-802
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
Installationof the Cockpit Circuit-Breaker Panel (CCBP) AMM 24-65-01-400-801
Removal of the Remote Data Concentrator (RDC) AMM 31-41-05-000-802
Installationof 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. Reset EICAS RDC B Circuit Breaker CB2-D2. Is the fault message still present?

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

  2. Disconnect RDC Cooling Fan (A193) connector. Is the fault still present?

    1. If NO, replace defective RDC Cooling Fan (A193).
    2. If YES, continue with next step.

  3. Confirm RDC strapping at RDC (A13).

    Measurements at Expected Result Result
    Conn. A13CP1-7B Aircraft Ground
    Conn. A13CP1-8K Aircraft Ground
    Conn. A13CP1-7A Aircraft Ground
    Conn. A13CP1-7K Aircraft Ground

    1. If the check is satisfactory, go to next step.
    2. If the check is not satisfactory, repair defective wire.

  4. Confirm presence of the grounds at RDC (A13).

    Measurements at Expected Result Result
    Conn. A13CP1-2J Aircraft Ground (PWR GND)
    Conn. A13CP1-2K Aircraft Ground (PWR GND)
    Conn. A13CP1-7C Chassis Ground
    Conn. A13CP1-7D Chassis Ground
    Conn. A13CP1-7G Chassis Ground
    Conn. A13CP1-7H Chassis Ground

    1. If the check is satisfactory, go to next step.
    2. if the check is not satisfactory, repair defective wire.

  5. Confirm presence of the 28 VDC at RDC (A13) and at RDC Cooling Fan (A193).

    Measurement at Expected Result Result
    Conn. A13CP1-1K 28 VDC
    Conn. A13CP1-1J 28 VDC
    Conn. A193P2-A 28 VDC

    1. If the check is satisfactory, replace defective RDC (A13).
    2. If the check is not satisfactory, go to next step.

  6. Do wiring check between RDC (A13) and the right Circuit Breaker Panel (CBP2) for the following wires:

    From To Result
    Conn. A13CP1-1A Conn. CBP2J1-30
    Conn. A13CP1-1B Conn. CBP2J1-30

    1. If the check is satisfactory, continue with next step.
    2. If the check is not satisfactory, repair defective wiring or defective Junction Box 3.

  7. Replace EICAS RDC B Circuit Breaker CB2-D2. Is the fault message is still present?

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

  8. Replace right Circuit Breaker Panel (CBP2).
  9. Do close out.

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