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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 UPLK OPEN

Message Code:

B3-007434

Associated CAS:

PROX SYS FAULT
(Advisory)

Reporting LRU: NGUPLK SNSR
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 32-61-05
32-61-09
32-61-12

Message Description:

PSEU detects an OPEN circuit within the proximity sensor PX06 Nose Gear Uplock or in the wiring to the proximity sensor or aircraft.

Possible Causes:

  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Nose Landing-Gear Uplock Proximity-Sensor (PX06)
  • 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
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. 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 wiring checks between PSEU A9AP1 (pins 4A, 3A) and J162 (pins A, B). Repair as required.

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

  3. Replace PX06.
    NOTE: 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. Sensor resistance is typically 11 to 13Ω.

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

  4. Replace PSEU.
  5. Do close out.

60_lh_cbpnl60_rh_cbpnlpseu_locationproximity_sensor6a

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