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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 TRK19 NO LOAD

Message Code:

B3-006603

Associated CAS:

None

Reporting LRU: TR-K19;MLGWOW
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 32-61-01

Message Description:

Proximity Sensor Electronic Unit (PSEU) detects that the discrete output to the Thrust Reverser (TR) Relay K19 is not connected to the user.

Possible Causes:

  • Left Secondary Power Center Relay (K19)
  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Connect the Batteries AMM 24-32-00-440-801
Removal of the Secondary Power Center (SPC) Relays AMM 24-62-04-000-801
Installation of the Secondary Power Center (SPC) Relays AMM 24-62-04-400-801
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
Test of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-720-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. Do wiring check from the Left Secondary Power Center connector A37P1 Pin 8 to the PSEU connector A9CP1 Pin 7B. Repair as required.

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

  2. Replace the Relay K19.

    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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