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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 CVRK40 OVLD FAULT

Message Code:

B3-006600

Associated CAS:

None

Reporting LRU: CVR-K40;MLGWOW
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 23-71-01
32-61-09

Message Description:

Proximity Sensor Electronic Unit detects an overload condition on the discrete output to the Cockpit Voice Recorder (CVR) Erase Enable Relay, K40.

Possible Causes:

  • Cockpit Voice Recorder (CVR) Relay (K40)
  • Junction Box JB4 Circuit-Card 4 (JB4-DB4)
  • 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 JB2 Circuit-Cards AMM 24-63-05-000-802
Installation of the Junction Box JB2 Circuit-Cards AMM 24-63-05-400-802
Operational Test of Junction Box JB2 Card 4 AMM 24-63-05-710-829
Removal of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-000-801
IInstallation 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 checks from the JB2-DB4 connector JB2BP1 Pin 26 to the PSEU connector A9AP1 Pin 2K. 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 4 of the Junction Box #2.

    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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