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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:

LMLG DNLK1 SHORTED

Message Code:

B3-007443

Associated CAS:

PROX SYS FAULT
(Advisory)

Reporting LRU: LGDLK1 SNSR
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 32-61-01
32-61-09
32-61-12

Message Description:

PSEU detects an internal SHORT in the proximity sensor PX09 Left Main Landing Gear Downlock1 or in the wiring to the proximity sensor is shorted to the aircraft.

Possible Causes:

  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Main Landing-Gear Downlock 1 Proximity-Sensor (LH) (PX09)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Main Landing-Gear (MLG) Proximity-Sensors AMM 32-61-01-000-801
Installation of the Main Landing-Gear (MLG) Proximity-Sensors AMM 32-61-01-400-801
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. Remove the PSEU from its rack and disconnect the connector PX09P1.
  3. Do wiring checks (shorted to ground = failure) between PX09J1 (pins1, 2) and ground. Repair as required.

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

  4. Replace PX09.
    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.

  5. Replace PSEU.
  6. Do close out.

60_lh_cbpnl60_rh_cbpnlpseu_location

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