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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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11/21/25

Message Overview:

Message Name:

NG WOFW2 SHORTED

Message Code:

B3-007487

Associated CAS:

PROX SYS FAULT
(Advisory)

Reporting LRU: PSEU
System Description: 32-60-00 - Position and Warning
Schematic Diagram: 32-61-00-101 - Position Indication System
Wiring Diagram: 32-61-05-1 - Nose-Landing-Gear Proximity Sensors
32-61-12-1 - Proximity-Sensor Electronic Unit (Power)

Message Description:

PSEU detects an internal SHORT circuit in the proximity sensor PX33 Left Nose Gear WOFW2 or the wiring to the proximity sensor is shorted to the aircraft.

Possible Causes:

  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Nose Landing-Gear Weight-Off-Wheels 2 Proximity-Sensor (PX33)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

Quick Links:

Standard Aircraft Configuration for Maintenance AMM 12-00-00-867-803
Electrical/Electronic Safety Precautions AMM 24-00-00-910-801
Electrostatic-Discharge Safety Precautions AMM 24-00-00-910-802
Operational Test of the Proximity Sensors AMM 32-61-00-710-801
Removal of the Nose Landing-Gear (NLG) Proximity-Sensors AMM 32-61-05-000-801
Installation of the Nose Landing-Gear (NLG) Proximity Sensors AMM 32-61-05-400-801
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

Troubleshooting Recommendations:

  1. Pull and reset the PSEU gear system breakers (CB1-C13, CB1-C14,CB2-C13, CB2-C14).

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

  2. Do AMM task 32-61-00-710-801 - Operational Test of the Proximity Sensors and make sure that the health for the sensor shows ok.
  3. Are the results good?

    1. If YES, do the close out.
    2. If NO, continue with next step.

  4. Separate P164 and J164.
  5. Perform continuity check of NOSE GEAR WOFW 2 (LEFT) Proximity Sensor PX33 (shorted to ground = failure). Repair as required.

    From: To: Expected Results:
    PSEU P164 Pin A GND ∞Ω (Open)
    PSEU P164 Pin B GND ∞Ω (Open)

  6. Are the results good?

    1. If YES, continue with next step.
    2. If NO, go to step 9.

  7. Do continuity wiring check between PSEU A9AP1 and NOSE GEAR WOFW 2 (LEFT) Proximity Sensor PX33. Repair as required.

    From: To: Expected Results:
    PSEU A9CP1Pin H10 J164 Pin A ≈0Ω
    PSEU A9CP1Pin H9 J164 Pin B ≈0Ω

  8. Are the results good?

    1. If YES, continue with next step.
    2. If NO, repair as required and do close out.

  9. Replace PX33.

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

  10. Replace PSEU.
  11. Do close out.

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