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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 OUTPUT

Message Code:

B3-249702

Associated CAS:

None

Reporting LRU: LDU
System Description: 31-41-00
Schematic Diagram: 31-41-00
Wiring Diagram: 31-52-01
31-52-03

Message Description:

A-LDU-1 bus and B-LDU-1 bus are reported inoperative by both Data Concentrator Unit (DCU) channels.

Possible Causes:

  • Lamp Driver Unit (LDU) (A52)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Lamp Driver Unit AMM 31-52-01-000-801
Installation of the Lamp Driver Unit AMM 31-52-01-400-801

Troubleshooting Recommendations:

  1. Reset ANNUNCIATOR CTRL 1 Circuit Breaker CB1-D3 and ANNUNCIATOR CTRL 2 Circuit Breaker CB2-D3. Is the fault message still present?

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

  2. Replace LDU (A52).
  3. Do close out.

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