background
x
loader
Troubleshooting
arrow By ATA By Message Color By Observed Faults by MDCBy Tips

Select color for CAS message that you wish to troubleshoot

(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.

This page includes :

For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

07/12/19

Message Overview:

MDC Fault Message:

NO RB-RIU-6 BUS INPUT

Equation ID:

B3-006538

Associated CAS:

None

Reporting LRU: DCU 2
System Description: 31-41-00
Schematic Diagram: 31-41-00
Wiring Diagram: 23-51-26
31-41-01
31-41-02
31-41-03
31-41-13

Message Description:

No RB-RIU-6 bus input at B-DCU, but data is present at R-MFD and R-CDU.

Possible Causes:

  • Data Concentrator Unit (DCU) (A14)
  • Junction Box 4 (JB4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Radio Interface Unit (RIU) AMM 23-51-21-000-801
Installation of the Radio Interface Unit (RIU) AMM 23-51-21-400-801
Removal of the Junction Box JB4 AMM 24-63-13-000-802
Installation of the Junction Box JB4 AMM 24-63-13-400-802
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
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 2 Circuit Breaker CB2-D1. Is the fault message still present?

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

  2. Do wiring check between DCU (A14) and RIU 2 (A18), through Junction Box 4, for the following wires:

    From To Result
    Conn. A14DP1-13A Conn. A18P2-31
    Conn. A14DP1-13B Conn. A18P2-32

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

  3. Replace DCU (A14).
  4. Do close out.

Registered and/or unregistered trademarks of Bombardier Inc. or its subsidiaries. © 2015 Bombardier Inc. All rights reserved.