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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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05/06/21

Message Overview:

Message Name:

PSEU OFF/NO OUTPUT

Message Code:

B3-007550

Associated CAS:

GEAR SYS FAIL
(Caution)

WOW FAIL
(Caution)

Reporting LRU: PSEU LRU
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 31-41-03
31-45-06
32-61-09

Message Description:

The Proximity Sensor Electronic Unit (PSEU) is either off, or there is no output received from the PSEU ARINC buses. Verify PSEU power and aircraft wiring.

Possible Causes:

  • Junction Box JB2 (JB2)
  • Junction Box JB4 (JB4)
  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Box JB2 AMM 24-63-05-000-803
Installation of the Junction Box JB2 AMM 24-63-05-400-803
Removal of the Junction Box JB4 AMM 24-63-13-000-802
Installation of the Junction Box JB4 AMM 24-63-13-400-802
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.

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

  2. Reset the circuit breakers R IAPS CB CB2-B6, L IAPS CB CB1-B6, then look for other failures related to the Input Output Concentrators, interchange the IOCs.

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

  3. Check the ARINC 429 data bus from the PSEU A9AP1 PINS 10J, 9J through Junction Box 2 to IAPS A4P101 PINS 61, 62. Repair as required.

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

  4. Check the ARINC 429 data bus from the PSEU A9AP1 PINS 10J, 9J through Junction Box 2 to DCU A14EP1 PINS 3A, 3B. Repair as required.

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

  5. Check the ARINC 429 data bus from the PSEU A9CP1 PINS 1B, 2B through Junction Box 4 to IAPS A4P1 PINS 61, 62. Repair as required.

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

  6. Check the ARINC 429 data bus from the PSEU A9CP1 PINS 1D, 2D through Junction Box 4 to DCU A14DP1 PINS 1A, 1B. Repair as required.

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

  7. Replace JB4 and JB2.

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

  8. If the fault is still there, replace the PSEU.
  9. Functional test the PSEU.
  10. Do close out.

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