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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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For AOG assistance contact:

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Quick Links

02/16/21

Message Overview:

Message Name:

CSU 1 / CSU 2 MISCOMPARE

Message Code:

B3-405655

Associated CAS:

None

Reporting LRU: CSU 1 / CSU 2
System Description: 31-45-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

Configuration Strapping Unit 1 data and Configuration Strapping Unit 2 data are reported different by the Maintenance Diagnostic Computer.

Possible Causes:

  • Options Control Module (OCM) (on A4CSU)
  • Configuration Strapping Unit (CSU) (A4CSU)
  • Input/Output Concentrator Unit (IOC) (A4IOC)
  • Integrated Avionics Processor System (IAPS) Card Cage (ICC) (A4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Strapping for CSU 1 & 2 can be compared by simultaneously looking at CSU DATA (LEFT) and CSU DATA (RIGHT) on the MDC CONFIGURATION DATA page.
The OCM provides protected strapping for the 16-bits of word 0.

Quick Links:

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
Removal of the Configuration Strapping Unit (CSU) AMM 31-45-17-000-801
Configuration Setting of the Configuration Strapping Unit (CSU) AMM 31-45-17-280-801
Installation of the Configuration Strapping Unit (CSU) AMM 31-45-17-400-801
Removal of the Options Control Module (OCM) AMM 31-45-21-000-801
Installation of the Options Control Module (OCM) AMM 31-45-21-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Do the Configuration Setting of the Configuration Strapping Unit. Re-configure as required.

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

  2. Swap OCMs.

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

  3. Swap CSUs.

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

  4. Swap IOCs.

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

  5. Replace IAPS Card Cage.
  6. Do close out.

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