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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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02/16/21

Message Overview:

Message Name:

NO PSEU-A BUS INPUT

Message Code:

B3-223997

Associated CAS:

None

Reporting LRU: IOC 1
System Description: 22-00-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

PSEU-A data absent at L-IOC and not absent at DCU-A/B.

Possible Causes:

  • Left Input/Output Concentrator Unit (IOC) (A4-IOC)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 21
  2. Comp Id = A004
  3. Fault Logged = AIR,TAXI
  4. Status = FAILED/WIRING
  5. {Term Definitions}

    1. IC1IN-1 1X 352 01 EXCT XXXX-TXXX XXXX-XXXX XXXX-XXXX 352: 28; WD1 PSEU-A INPUT FAIL
    2. DCU1-31 1X 357 01 EXCT XXXX-XTXX XXXX-XXXX XXXX-XXXX 357: 27; PSEU-A BUS INOP
    3. DCU2-31 2X 357 10 EXCT XXXX-XTXX XXXX-XXXX XXXX-XXXX 357: 27; PSEU-A BUS INOP

Quick Links:

Operational Test of the Integrated-Avionics Processor System (IAPS) AMM 31-45-00-710-801
Removal of the Integrated-Avionics Processor System (IAPS) Card Cage (ICC) AMM 31-45-01-000-801
Installation of the Integrated-Avionics Processor System (IAPS) Card Cage (ICC) AMM 31-45-01-400-801
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
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. Suspect wiring or failed L-IOC input.
  2. Reset L IAPS Circuit Breaker CB1-B6. Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, do close out.
      NOTE: Before you open the IAPS circuit breakers, make sure that all Engine FADEC circuit breakers are open. If the Engine FADEC circuit breakers remain closed, Engine Igniters will activate. This can cause injury to persons and damage to equipment.

  3. Swap right IOC with left IOC. Is the fault message still present.

    1. If YES, continue with next step.
    2. If NO, replace defective IOC.

  4. Replace Integrated Avionics-Processor System (IAPS) Card Cage (ICC) (A4).
  5. Do close out.

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