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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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03/16/21

Message Overview:

Message Name:

MLGDLK CCRK51 NO LOAD

Message Code:

B3-307513

Associated CAS:

PROX SYS FAULT
(Advisory)

Reporting LRU: CCR-K51; MLGDNLK
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 32-31-01
32-61-09

Message Description:

PSEU detects that the discrete output to the Completion Center Relay (CCR) K51 is not connected to the user. Verify user interface, CCR K51 and related wiring.

Possible Causes:

  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Relay (K51)
  • Junction Box JB4 Circuit-Card 2 (JB4-DB2)
  • 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. Dowiring check from the JB4-DB2 connector JB4EP1 Pin 20 to the PSEU connector A9AP1 Pin 1K. 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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