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

03/23/21

Message Overview:

Message Name:

NO R-IRS-1 BUS OUTPUT

Message Code:

B3-006991

Associated CAS:

None

Reporting LRU: IRS 2
System Description: 34-00-00
Schematic Diagram: 34-45-00
Wiring Diagram: 34-45-01

Message Description:

No R-IRS-1 data received at (R-IOC and SPC).

Possible Causes:

  • Inertial Reference Unit (IRU) No. 2 (A232)
  • Junction Box (JB4)
  • Stall Protection Computer (A178)
  • Input/Output Concentrator Unit (IOC) No. 2 (Right) (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 Junction Box JB4 AMM 24-63-13-000-802
Installation of the Junction Box JB4 AMM 24-63-13-400-802
Operational Test of the Stall Protection System (SPS) AMM 27-32-00-710-801
Removal of the Stall Protection Computer AMM 27-32-01-000-801
Installation of the Stall Protection Computer AMM 27-32-01-400-801
Operational Test of the Integrated-Avionics Processor System (IAPS) AMM 31-45-00-710-801
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
Operational Test of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-710-801
Operational Test of the Inertial Reference System (IRS) AMM 34-45-00-710-801
Removal of the Inertial Reference Unit (IRU) AMM 34-45-01-000-801
Installation of the Inertial Reference Unit (IRU) AMM 34-45-01-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset IRU 2 (CB2-C2) circuit breaker.

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

  2. Swap IRUs.

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

  3. Do wiring check of the ARINC 429 data bus R-IRS-1 from IRU 2 connector A232P1, through Junction Box 4, to SPC connector A178BP1 and IAPS connector A4P101. 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. Swap IOCs.

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

  5. Replace Stall Protection Computer (SPC).

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

  6. Replace IAPS Card Cage (ICC).
  7. Do close out.

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