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(WARNING)
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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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02/02/26

Message Overview:

Message Name:

NO B-SPC-1 BUS TO IOC

Message Code:

B3-007950

Associated CAS:
STALL PROTECT FAIL
(CAUTION) 

Reporting LRU: STALL COMPUTER
System Description: 27-32-00 - Stall Protection System (SPS)
Schematic Diagram: 27-32-00 - Stall Protection System
Wiring Diagram: 27-32-01 - Stall Protection Computer
27-32-05 - Stick Shaker

Message Description:

Right Input/Output Concentrator is not receiving data from Stall Protection Computer (SPC) channel B.

Possible Causes:

  • Right Input/Output Concentrator (IOC) (A4-IOC2)
  • Stall Protection Computer (SPC) (A178)
  • Integrated-Avionics Processor System (IAPS) Card Cage (ICC) (A4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

Quick Links:

General Setup for Maintenance
Standard Aircraft Configuration for Maintenance AMM 12-00-00-867-803
Electrical/Electronic Safety Precautions AMM 24-00-00-910-801
Electrostatic Discharge Safety Precautions AMM 24-00-00-910-802
Maintenance Tasks
Removal of the Junction Box JB3 AMM 24-63-09-000-802
Installation of the Junction Box JB3 AMM 24-63-09-400-802
Functional Test of Junction Box JB3 AMM 24-63-09-720-801
Replacement of DC Circuit Breakers AMM 24-65-00-960-801
Operational Test of the Stall Protection System (SPS) AMM 27-32-00-710-801
Functional Test of the Stall Protection System AMM 27-32-00-720-801
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

Troubleshooting Recommendations:

  1. Reset the following circuit breakers and perform the Pilot Activated Test (PAT) of the Stall Protection System on the Systems Test control-panel located on the center pedestal.

    STALL L PWR CB1-B10
    STALL R PWR CB2-B10

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

  2. Do wiring check of ARINC 429 B-SPC-1 data bus between SPC connector A178BP1 and IAPS connector A4P101.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.
      NOTE: An internal short of any LRU connected to this ARINC bus may cause the fault.

  3. Interchange IOCs.

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

  4. Replace SPC.

    1. If system checks are good, 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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