04/09/21
Message Overview:
Message Description:
Proximity Sensor Electronic Unit (PSEU) detects an OPEN circuit within the Proximity Sensor PX48 Battery Bay Door Closed, or in the wiring to the proximity sensor or aircraft.
Possible Causes:
- Proximity Sensor Electronic Unit (PSEU) (A9)
- Battery Bay Door Closed Proximity Sensor (PX48)
- 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 |
| Removal of the Battery-Access Door Proximity-Sensor | AMM 52-71-27-000-801 |
| Installation of the Battery-Access Door Proximity-Sensor | AMM 52-71-27-400-801 |
| 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.
- Verify the wiring from the PSEU A9CP1 PIN 3H to PX48 SP118 PIN A2, and from PSEU A9CP1 PIN 4H to PX48 SP118 PIN B2.
- 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 PX48 per the installation procedure, and then check the sensor out.
- If the fault is still there, replace the PSEU.
- Perform the functional check of Proximity Sensor Electronic Unit.
- Do close out.
