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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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03/02/21

Message Overview:

Message Name:

SPC OFF/ON OUTPUT

Message Code:

B3-007948

Associated CAS:

STALL PROTECT FAIL
(Caution)

Reporting LRU: STALL COMPUTER
System Description: 27-32-00
Schematic Diagram: 27-32-00
Wiring Diagram: 27-32-01
27-32-05

Message Description:

Absence of Stall Protection Computer (SPC) input to Data Concentrator Unit (DCU) and Input/Output Concentrator Unit (IOC).

Possible Causes:

  • Stall Protection Computer (SPC) (A178)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-27-0105 - "STALL PROTECT FAIL" Nuisance CAS Message (20501 to 20999)
  • SB100-27-14 - Modification - Stall Protection System - Introduction of the Stall Protection Computer (SPC) Part No. 822-1792-003 to Correct Loopback ARINC 429 Failure Messages (20501 - 20999)

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

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.

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

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

  2. Re-rack SPC and at the same time inspect connectors A178AP1 and A178BP1. Replace/repair as required.

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

  3. Ensure 'main' power and ground are available at SPC channel A.

    1. If 28 VDC and ground are available at SPC connector A178AP1, go to step 5.
    2. If 28 VDC and ground are not available at SPC connector A178AP1, continue with next step.

  4. Do wiring check between SPC connectors A178AP1 and circuit breaker CB1-B10. Repair/replace as required.

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

  5. Ensure "main" power and ground are available at SPC channel B.

    1. If 28 VDC and ground are available at SPC connector A178BP1, go to step 7.
    2. If 28 VDC and ground are not available at SPC connector A178BP1, continue with next step.

  6. Do wiring check between SPC connector A178BP1 and circuit breaker CB1-B11. Repair/replace as required.

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

  7. Replace SPC.
  8. Do close out.

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