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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:

MLGWOW CCRK50 OVLD FAULT

Message Code:

B3-006590

Associated CAS:

None

Reporting LRU: CCR-K50;MLGWOW
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 32-31-01
32-61-09

Message Description:

Proximity Sensor Electronic Unit detects an overload condition on the discrete output to the Completion Center Relay (CCR)-K50.

Possible Causes:

  • CCR-K50 (Junction Box 4 - Circuit Card 2)
  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Box JB4 Circuit-Cards AMM 24-63-13-000-803
Installation of the Junction Box JB4 Circuit-Cards AMM 24-63-13-400-803
Operational Test of Junction Box JB4 Card 2 AMM 24-63-13-710-802
Removal of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-000-801
Installation of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-400-801
Functional Test of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-720-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Do wiring check from the JB4-DB2 connector JB4EP1 Pin 19 to the PSEU connector A9CP1 Pin 10A. Repair as required.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  2. Replace the Circuit Board 2 of the Junction Box 4.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  3. Replace the PSEU.
  4. Do close out.

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