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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:

PSEU-A ARINC CH FAILED

Message Code:

B3-007558

Associated CAS:

PROX SYS FAULT
(Advisory)

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

Message Description:

No PSEU-A transmission or corrupted PSEU-B transmission to Data Concentrator Unit (DCU) and IOC 1. Aircraft wiring or PSEU requires troubleshooting.

Possible Causes:

  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Input/Output Concentrator 1 (IOC 1) (A4-IOC1)
  • Junction Box 4 (JB4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Box JB1 AMM 24-63-01-000-802
Installation of the Junction Box JB1 AMM 24-63-01-400-802
Removal of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-000-801
Installation of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-400-801
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
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), recheck the system for the fault.

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

  2. Check the ARINC 429 data bus from the PSEU A9CP1 PINS 1B, 2B to IAPS A4P1 PINS 61, 62, and PSEU A9CP1 PINS 1B, 2B to DCU PINS A14DP1 1A, 1B. Repair as required.

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

  3. Reset the circuit breakers L IAPS CB CB1-B6 then look for other failures related to the Input Output Concentrators, swap or replace the IOCs if this is suspected.

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

  4. With JB4 connector JB4CP1 check continuity between PINS 9K and 6F and between 9K and 10E. Check continuity between PINS 10A and 6G and between10A and 10F.

    1. If system checks are good, do step 6.
    2. If fault remains, continue with next step.

  5. Replace JB4.

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

  6. Replace the PSEU.
  7. Functional Test of the Proximity Sensor Electronic Unit (PSEU).

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