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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:

NG DNLK2 OPEN

Message Code:

B3-007507

Associated CAS:

PROX SYS FAULT
(Advisory)

Reporting LRU: NGDLK2 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 internal SHORT circuit in the proximity sensor PX40, Left Nose Gear Door Closed, or the wiring to the proximity sensor to the aircraft.

Possible Causes:

  • Nose Landing-Gear Downlock 2 Proximity-Sensor (PX40)
  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • 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 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
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. Remove the PSEU from its rack and disconnect the connector PX40P1. Verify the wiring from the PX40J1 to ground and from PX40J1 PIN B2 to ground. The wires should be open to ground.
  3. If the wiring checks good, download and have field service review the PSEU NVM. Further troubleshooting will depend on results of the PSEU NVM.
  4. If the fault is still there, replace PX40 and then check the sensor.
  5. If the fault is still there, replace the PSEU.
  6. Functional check the proximity sensor electronic unit.

pseu_location60_lh_cbpnl60_rh_cbpnl

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