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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 BCU-A (IB) BUS OUTPUT

Message Code:

B3-006384

Associated CAS:

INBD BRAKES FAIL
(Caution)

Reporting LRU: BRAKE CTRL UNIT
System Description: 32-43-00
Schematic Diagram: 32-43-00
Wiring Diagram: 32-43-01

Message Description:

The Remote Data Concentrator (RDC) is not receiving the inboard BCU ARINC signal.

NOTE: This code will be logged during power interruptions (C/B reset, BCU internal reset).

Possible Causes:

  • Brake Control Unit (BCU) (A67)
  • Remote Data Concentrator (RDC) (A13)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of Remote Data Concentrator (RDC) AMM 31-41-05-000-802
Installation of Remote Data Concentrator (RDC) AMM 31-41-05-400-802
Removal of the Brake Control Unit AMM 32-43-01-000-801
Installation of the Brake Control Unit AMM 32-43-01-400-801
Data Download from the Maintenance Diagnostic Computer (MDC) AMM 45-45-01-970-802
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Electrical Wiring - Continuity Test - Adjustment/Test SPM 20-12-01-05
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. If other brake system related fault codes are shown in B3-006384 fault code time frame, troubleshoot the other codes first.
    NOTE: This code will be logged during power interruptions (C/B reset, BCU internal reset).
  2. Verify that there are no L ESS BUS related CAS messages. Troubleshoot as required.
  3. Reset the following circuit breakers.

    Location CB Number CB Names Zone
    LCBP C15 INBD BRAKES 211
    LCBP D2 RDC A 211

    1. If fault disappears, no other action is required.
    2. If fault is still shown, go to next step.

  4. Carry out a wiring check per the following table:

    From Connector Pin To Connector Pin
    A67P2 (BCU) 54 A13DP1 (RDC) 3A
    A67P2 (BCU) 55 A13DP1 (RDC) 3B

    1. Repair as required.
    2. If wiring is found serviceable, go to next step.

  5. Carry out a power check per the following table:

    From Connector Pin To Connector Pin Expected Results
    A67P2 (BCU) 4 A67P2 (BCU) 5 ≈ 28 VDC

    1. Repair as required.

      1. If no fault found, replace BCU.

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