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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-1 INPUT TO CH A

Message Code:

B3-007708

Associated CAS:

None

Reporting LRU: RDC A&B
System Description: 31-41-00
32-43-00
Schematic Diagram: 31-41-00
32-43-00
Wiring Diagram: 31-41-09
31-41-13
32-43-25

Message Description:

A-BCU-1 bus is reported inoperative by Remote Data Concentrator (RDC) channel A, while A-BCU-1 is not reported inoperative by Remote Data Concentrator (RDC) channel B.

Possible Causes:

  • Remote Data Concentrator (RDC) (A13)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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

Troubleshooting Recommendations:

  1. Reset EICAS RDC A circuit breaker CB1-D2. Is the fault message still present?

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

  2. Replace RDC (A13).
  3. Do close out.

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