background
x
loader
Troubleshooting
arrow By ATA By Message Color By Observed Faults by MDCBy Tips

Select color for CAS message that you wish to troubleshoot

(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.

This page includes :

For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

02/16/21

Message Overview:

Message Name:

NO L-IOC-2 BUS OUTPUT

Message Code:

B3-648307

Associated CAS:

None

Reporting LRU: IOC 1
System Description: 31-45-00
Schematic Diagram: 31-45-00
Wiring Diagram: 31-45-01
31-45-11

Message Description:

L-IOC-2 bus is reported missing by TSS and R-TDR.

Possible Causes:

  • Left Input/Output Concentrator Unit (IOC) 1 (A4-IOC1)
  • Junction Box 4 (JB 4)
  • Air Traffic Control (ATC) (A31)
  • Traffic/Collision Avoidance System (TCAS) Traffic Surveillance System (TSS) Transponder Unit (A238)
  • Right Air Traffic Control (ATC) Transponder (A30)
  • Left File Server Unit (FSU) 1 (A221)
  • Weather Radar Receiver/Transmitter and Antenna (A3)
  • Data Loader Panel (PL50)
  • 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 Junction Boxes AMM 24-63-01-000-802
Installation of the Junction Boxes AMM 24-63-01-400-802
Removal of the Data Loader Panel AMM 25-72-03-000-801
Installation of the Data Loader Panel AMM 25-72-03-400-801
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
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
Removal of the Traffic/Collision Avoidance System (TCAS) and
Traffic Surveillance System (TSS) Transponder Unit		 AMM 34-43-03-000-801
Installation of the Traffic/Collision Avoidance System (TCAS) and
Traffic Surveillance System (TSS) Transponder Unit		 AMM 34-43-03-400-801
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
Removal of the File Server Unit (FSU) AMM 46-21-01-000-801
Installation of the File Server Unit (FSU) AMM 46-21-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset L IAPS (CB1-B6) circuit breaker.

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

  2. Swap IOCs.

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

  3. Do a complete wiring check of the ARINC 429 data bus L-IOC-2 from IAPS connector A4P3, through Junction Box 4, to all receiving LRUs. Repair/replace as required.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.
      NOTE: An internal short of any LRUs connected to this data bus might cause this failure.

  4. Disconnect File Server Unit 1.

    1. If fault remains, go to step 6.
    2. If system check passes, continue with next step.

  5. Replace File Server Unit 1 (can be swapped if dual FSUs are installed).

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

  6. Disconnect Weather Radar Receiver/Transmitter and Antenna.

    1. If fault remains, go to step 8.
    2. If system check passes, continue with next step.

  7. Replace Weather Radar Receiver/Transmitter and Antenna.

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

  8. Disconnect Data Loader Panel.

    1. If fault remains, go to step 10.
    2. If system check passes, continue with next step.

  9. Replace Data Loader Panel.

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

  10. Replace Traffic/Collision Avoidance System (TCAS) and Traffic Surveillance System (TSS) Transponder Unit.

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

  11. Replace Air Traffic Control (ATC) Transponder 2.

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

  12. Replace ICC.
  13. Do close out.

Registered and/or unregistered trademarks of Bombardier Inc. or its subsidiaries. © 2015 Bombardier Inc. All rights reserved.