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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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04/02/21

Message Overview:

Message Name:

NO WXT-4 BUS TO IOC

Message Code:

B3-648498

Associated CAS:

None

Reporting LRU: WXR RTA
System Description: 34-41-00
Schematic Diagram: 34-41-00
Wiring Diagram: 34-41-01

Message Description:

WXT-4 bus is not being received by the R IOC.

Possible Causes:

  • Weather Radar Receiver/Transmitter and Antenna (WXR RTA) (A3)
  • Right Input/Output Concentrator Unit (IOC) (A4-IOC2)
  • 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 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 Weather Radar Receiver/Transmitter and Antenna AMM 34-41-01-000-801
Installation of the Weather Radar Receiver/Transmitter and Antenna AMM 34-41-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset WX (CB1-A8) and R IAPS (CB2-B6) circuit breakers.

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

  2. Swap IOCs.

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

  3. Do a wiring check of the WXT-4 ARINC 429 databus between Weather Radar Receiver/Transmitter and Antenna connector A3P1 and IAPS connector A4P101. Repair/replace as required.

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

  4. Replace WXR RTA.

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

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

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