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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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03/11/21

Message Overview:

Message Name:

NG WOFW1 SHORTED

Message Code:

B3-007423

Associated CAS:

PROX SYS FAULT
(Advisory)

Reporting LRU: NGWOFW1 SNSR
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 32-61-05
32-61-12

Message Description:

PSEU detects an internal SHORT circuit in the proximity sensor PX03 Right Nose Gear WOFW1 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 1 Proximity-Sensor (PX03)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

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. Separate P165 and J165.
  3. Perform continuity check of NOSE GEAR WOFW 1 (RIGHT) Proximity Sensor PX03 (shorted to ground = failure). Repair as required.

    From: To: Expected Results:
    PSEU P165 Pin 6 GND ∞Ω (Open)
    PSEU P165 Pin 18 GND ∞Ω (Open)

    1. If continuity checks fail, replace NOSE GEAR WOFW 1 (RIGHT) Proximity Sensor PX03.
    2. Reconnect P514 and J514 and continue with next step.

  4. Does B3-007423 MDC Fault Code clear?

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

  5. Do continuity wiring check between PSEU A9AP1 and NOSE GEAR WOFW 1 (RIGHT) Proximity Sensor PX03. Repair as required.

    From: To: Expected Results:
    PSEU A9AP1Pin 1C J165 Pin6 ≈0Ω
    PSEU A9AP1Pin 2C J165 Pin18 ≈0Ω

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

  6. Do continuity check of NOSE GEAR WOFW 1 (RIGHT) Proximity Sensor PX03. Repair as required.
    CAUTION: Sensor resistance should be made with a meter using a < 10 mA supply of current. Never apply voltage through a sensor!
    Current will magnetize the sensor rendering it unreliable.

    From: To: Expected Results:
    PX03 P165 Pin 6 P165 Pin18 11 - 13 Ω

    1. If PX03 checks are good, do close out.
    2. If fault remains, continue with next step.

  7. Replace PX03.

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

  8. Replace PSEU.
  9. Do close out.

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