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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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04/06/21

Message Overview:

Message Name:

CSU STRAPPING INCORRECT

Message Code:

B3-671959

Associated CAS:

None

Reporting LRU: CSU 1/CSU 2
System Description: 34-54-00
Schematic Diagram: 34-54-00
Wiring Diagram: 34-54-01

Message Description:

Both FMCs are reporting that the CSU straps are not set correctly.

Possible Causes:

  • Left Inertial Reference Unit 1 (IRU) (A233)
  • Right Adaptive Flight-Display Unit 2 (MFD) (A28)
  • Integrated-Avionics Processor System (IAPS) Card Cage (ICC) (A4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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 Air Traffic Control (ATC) Transponder AMM 34-54-01-000-801
Installation of the Air Traffic Control (ATC) Transponder AMM 34-54-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Change the CSU straps to comply with aircraft drawings and then cycle power for the entire avionics system.

    1. CSU straps to check include: Word 4 must enable dual FMS;
    2. Word 5 must not enable ATT/HDG4;
    3. Word 6 must not enable ADC3;
    4. Word 7 must not enable DCU3;
    5. Word 13 must not enable GNSS3.

  2. FMS will not be usable as it will be continually resetting due to a Fatal Error.

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