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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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03/02/21

Message Overview:

Message Name:

RTL SPEED DISCRETE FAIL

Message Code:

B3-007971

Associated CAS:

None

Reporting LRU: STALL COMPUTER
System Description: 27-32-00
Schematic Diagram: 27-32-00
Wiring Diagram: 27-32-01
27-32-05
27-32-09
27-32-13
27-32-21

Message Description:

The RTL speed discrete output signals from SPC A are invalid.

Possible Causes:

  • Stall Protection Computer (SPC) (A178)
  • Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) (A130)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

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
Removal of the Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) AMM 27-41-21-000-801
Installation of the Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) AMM 27-41-21-400-801
Operational Test of the Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) AMM 27-41-21-710-801
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.

    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 RTL speed discrete wires between SPC and HST ECU. Repair as required.

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

  3. Re-rack SPC.

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

  4. Replace SPC.

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

  5. Re-rack HST ECU.

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

  6. Replace HST ECU.
  7. Do close out.

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