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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:

LINGSST SC FAIL

Message Code:

B3-007595

Associated CAS:

PROX SYS FAULT
(Advisory)

Reporting LRU: PSEU LRU
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 27-61-09
32-61-09
32-61-12

Message Description:

L Inboard Ground Spoiler Sensor PX43 signal conditioning failed.

Possible Causes:

  • Proximity Sensor Electronic Unit (PSEU) (A9)
  • Left Proximity Sensor (PX43)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Spoiler Proximity Sensor AMM 27-61-09-000-801
Installation of the Spoiler Proximity Sensor AMM 27-61-09-400-801
Operational Test of the Ground Spoiler Proximity Sensors AMM 27-61-09-710-801
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 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 PX31, PX34, PX40, PX46 and PX49 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 PX43.
    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 13 Ω.

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

  4. Replace PSEU if failure is on PX43 only and the NVM download does not identify external inputs as the fault.
  5. Do close out.

pseu_location60_lh_cbpnl60_rh_cbpnl

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