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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:

INTERNAL FAULT CH A

Message Code:

B3-007694

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:

Critical internal fault reported by Remote Data Concentrator (RDC) channel A.

Possible Causes:

  • Maintenance Diagnostics Table (MDT)
  • Remote Data Concentrator (RDC) (A13)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

NOTE: This message could be posted if the wrong Maintenance Diagnostics Table (MDT) is loaded on the aircraft.

RDC Diagnostic Wd 1 - Label 350 (internal failure bit only)
Bit Bit Definition Bit Bit Definition
11 #RAM Fault (1 = Fault) 14 #ATM 1 TX/RX Loopback Test (1 = Fault)
12 #Map Checksum/CRC (1 = Fault) 15 #ATM 2 TX/RX Loopback Test (1 = Fault)
13 #Application Code Checksum/CRC (1 = Fault) 16 #ATM 3 TX/RX Loopback Test (1 = Fault)

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
Load the Maintenance Diagnostic Tables (MDT) to the Maintenance Diagnostic Computer (MDC) AMM 45-45-01-970-803

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. Check to see what MDT P/N is loaded on the aircraft. Make sure to reload the correct MDT for the aircraft configuration. Is the fault still present?

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

  3. Replace the RDC (A13).
  4. Do close out.

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