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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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03/31/21

Message Overview:

Message Name:

INTERNAL FAULT

Message Code:

B3-481651

Associated CAS:

None

Reporting LRU: DBU 1
System Description: 34-61-00
Schematic Diagram: 34-61-00
Wiring Diagram: 34-61-09

Message Description:

An internal DBU fault is detected.

Possible Causes:

  • Data Base Unit 1 (DBU) (A191)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 1
  2. {Term Definitions}

    1. DBU1-6 2X 351 00 OR'D XXXX-XXXX XXXX-XTTT TXXX-XXXX 351 :19+18+17+16;MISC DBU FAIL

Quick Links:

Removal of the Data Loader Panel AMM 25-72-03-000-801
Installation of the Data Loader Panel AMM 25-72-03-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Replace the DBU.

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