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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:

MLGWOW K159 DRV FAULT

Message Code:

B3-230144

Associated CAS:

PROX SYS FAULT
(Advisory)

Reporting LRU: PSEU LRU
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 25-72-23
32-61-09

Message Description:

Proximity Sensor Electronic Unit Discrete Output DOT13A, MLGWOW to L Dataload Relay K159 Driver Failed.

Possible Causes:

  • 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 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
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Pull and reset the PSEU gear system breakers (CB1-C13, CB1-C14, CB2-C13, CB2-C14), recheck the system for the fault.
  2. Check continuity of the aircraft wiring between the JB1-DB1 JB1EP1 PIN 57 to PSEU A9CP1 PIN 9B, the wire should be open to ground. With the PSEU installed, the JB1EP1 PIN 57 should be open for WOW. PSEU discrete block diagram.
  3. If possible, download and have field service review the PSEU NVM. Further troubleshooting will depend on results of the PSEU NVM.
  4. If the failure still exists with the wiring good, and the NVM download does not identify external inputs as the fault, replace the PSEU IAW.
  5. Functional check the proximity sensor electronic unit IAW AMM 32-61-09-720-801.

60_lh_cbpnl60_rh_cbpnl60_pseu_discrete_outputsproximity_sensor

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