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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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03/30/21

Message Overview:

Message Name:

NO L-IOC-2 BUS INPUT

Message Code:

B3-463379

Associated CAS:

None

Reporting LRU: TDR 1
System Description: 34-54-00
Schematic Diagram: 34-54-00
Wiring Diagram: None

Message Description:

IOC-2 bus from L-IOC is reported missing by L-TDR but not by the R-TDR. L-TDR (IOC-2) input pins are P2-27 and 28. R-TDR (IOC-2) input pins are P2-39 and 40.

Possible Causes:

  • Input/Output Concentrator Unit 2 (IOC) (A4-IOC2)
  • Left Air Traffic Control Transponder 1 (ATC) (A31)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 12
  2. Comp Id = A031
  3. {Term Definitions}

    1. TDR1-23 1X 353 01 EXCT XXXX-XXXX XXXX-XXXX XXXX-XTXX 353: 11;FMS/IRS IOC-2 ONSIDE BUS
    2. TDR2-24 2X 353 10 EXCT XXXX-XXXX XXXX-XXXX XXXT-XXXX 353: 13;AIS/ADS IOC-2 XSIDE BUS
    3. IOC1-1 1X 350 01 ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 1X IN;

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 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. Suspect Failed Input, L-IOC-2 Output, Wiring, or Connector. L-TDR (IOC-2) input pins are P2-27 and 28. R-TDR (IOC-2) input pins are P2-39 and 40.

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