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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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03/15/21

Message Overview:

Message Name:

LGDLK2 SC FAIL

Message Code:

B3-007591

Associated CAS:

PROX SYS FAULT
(Advisory)

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

Message Description:

Left Main Landing Gear Downlock2 Sensor PX39 signal conditioning failed.

Possible Causes:

  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Main Landing-Gear Downlock 2 Proximity-Sensor (LH) (PX39)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Operational Test of the Proximity Sensors AMM 32-61-00-710-801
Functional Test of the Proximity Sensors AMM 32-61-00-720-801
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
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
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. If PX33, PX42 and PX45 also indicate Signal Conditioning Failure, troubleshoot these sensors for a short to ground. Repair as required.

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

  3. Replace PX39.
    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 if the failure is on PX39 only and the NVM download does not identify external inputs as the fault.
  5. Do close out.

60_lh_cbpnl60_rh_cbpnl60_mlg_dwn_lkd_proxpseu_location

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