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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:

L/R AOA DISAGREE

Message Code:

B3-007954

Associated CAS:

STALL PROTECT FAIL
(Caution)

Reporting LRU: STALL COMPUTER
System Description: 27-32-00
Schematic Diagram: 27-32-00
Wiring Diagram: 27-32-09

Message Description:

The left and right AOA measurements miscompare. Check for AOA sensor(s) drifted or uncompensated aerodynamic effect.

Possible Causes:

  • Angle-Of-Attack Sensor (LH) (A141)
  • Angle-Of-Attack Sensor (RH) (A142)
  • 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 to 20999)

Forum Articles/Infoservice/Newsletter: None

If the amber 'STALL PROTECT FAIL' caution CAS message appears after SPC power up, reset the SPC circuit breakers 'SPC CH A' (CBP1-B10) and 'SPC CH B' (CBP2-B10).

If the message appears following a PAT, then reset the SPC circuit breakers 'SPC CH A' (CBP1-B10) and 'SPC CH B' (CBP2-B10). Perform another PAT and make sure the message does not come back.

Enter the MAINTENANCE MAIN MENU. With the CCP 2, make the selection of the SYSTEM PARAMETERS page 2/2. You will be able to monitor the integrity of the R AOA vane position.

  • Move the right AOA vane to the up stop: The compensated body AOA is between 58.66 to 65.50 degrees on the MFD 2.
  • Move the right AOA vane to the down stop: The compensated body AOA is between -53.50 to -60.34 degrees on the MFD 2.

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 Stick Shaker AMM 27-32-05-000-801
Installation of the Stick Shaker AMM 27-32-05-400-801
Removal of the Angle-of-Attack Sensor AMM 27-32-09-000-801
Installation of the Angle-of-Attack Sensor AMM 27-32-09-400-801
Operational Test of the Angle-of-Attack Sensor AMM 27-32-09-710-801
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 SPC circuit breakers 'SPC CH A' (CBP1-B10) and 'SPC CH B' (CBP2-10) and perform an SPC operational test (PAT).

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

  2. Do wiring check between SPC and AOAs vane. Repair as required.

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

  3. Replace AOAs.

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

  4. Replace SPC.
  5. Do close out.

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