04/09/21
Message Overview:
Message Description:
Proximity-Sensor Electronic Unit (PSEU) detects an OPEN circuit within the Proximity Sensor PX46, Baggage Bay Door Closed or in the wiring to the proximity sensor or aircraft.
Possible Causes:
- Proximity Sensor Electronic Unit (PSEU) (A9)
- Baggage Door Handle Locked Proximity Sensor (PX46)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Quick Links:
| 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 |
| Operational Test of the Door Sensors | AMM 52-71-00-710-801 |
| Built-In Test of the Door Proximity-Sensors | AMM 52-71-00-740-801 |
| Removal of the Baggage-Door Locked Proximity-Sensor | AMM 52-71-05-000-802 |
| Installation of the Baggage-Door Locked Proximity-Sensor | AMM 52-71-05-400-802 |
| Wiring - Maintenance Practices - ALL | SPM 20-12-00-02 |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- Pull and reset the PSEU gear system breakers (CB1-C13, CB1-C14, CB2-C13,CB2-C14), recheck the system for the fault.
- Remove the PSEU from its rack and disconnect the connector SP114 from PX46. Verify the wiring check from the PX46 SP114 PIN A2 to ground and from PX46 SP114 PIN B2 to ground. The wires should be open to ground.
- If the wiring checks good, download and have field service review the PSEU NVM. Further troubleshooting will depend on results of the PSEU NVM.
- If the fault is still there, replace PX46 per the installation procedure, and then check the sensor out.
- If the fault is still there, replace the PSEU.
- Functional check the proximity sensor electronic unit.
- Do close out.
