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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:

RMLG WOW1 SC FAIL

Message Code:

B3-007569

Associated CAS:

PROX SYS FAULT
(Advisory)

Reporting LRU: PSEU LRU
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 32-61-03
32-61-12

Message Description:

Right Main Landing Gear WOW1 Sensor PX01 signal conditioning failed.

Possible Causes:

  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Right Main Landing-Gear Weight-On-Wheels 1 Proximity-Sensor (PX01)
  • 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
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),recheck the system for the fault.
  2. If PX04, PX10, PX13 and PX16 also indicate Signal Conditioning Failure, troubleshoot these sensors for a short to ground. Perform the operational test of the proximity sensors IAW AMM TASK 32-61-00-710-801.
  3. Troubleshoot and repair or replace PX01 per the installation procedure IAW AMM TASK 32-61-01-400-801, then check the sensor out IAW AMM TASK 32-61-00-720-801.
    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.
  4. If possible, download and have field service review the PSEU NVM. Further troubleshooting will depend on results of the PSEU NVM.
  5. If failure is on PX01 only with the sensor and wiring good, and the NVM download does not identify external inputs as the fault, replace the PSEU IAW AMM TASK 32-61-09-000-801, AMM TASK 32-61-09-400-801.
  6. Functional check the proximity sensor electronic unit IAW AMM TASK 32-61-09-720-801.

pseu_location60_lh_cbpnl60_rh_cbpnl60 Ground Spoiler60_mlg_uplock_prox50_passenger_door_prox60_nlg_dwn_lkd_proxwow_prox_sensorsproximity_sensor1

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