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(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.

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03/02/21

Message Overview:

Message Name:

A/P DISCONNECT FAIL

Message Code:

B3-007970

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

Message Description:

The STALL DISENGAGE output signal from SPC A or SPC B is invalid or shorted to ground. Verify SPC and aircraft wiring.

Possible Causes:

  • Stall Protection Computer (SPC) (A178)
  • 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
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 SPC circuit breakers 'SPC CH A' (CBP1-B10) and 'SPC CH B' (CBP2-10) and perform an SPC Pilot Activated Test (PAT).

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

  2. Re-rack SPC.

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

  3. Do wiring check between SPC connector A178AP1 and Flight Guidance Panel connector PL9P1. Repair as required.

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

  4. Do wiring check between SPC connector A178BP1 and Flight Guidance Panel connector PL9P2. Repair as required.

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

  5. Replace SPC.
  6. Do close out.

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