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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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CRC Montreal (YUL)
Quick Links

02/26/21

Message Overview:

Message Name:

L AOA SINGLE FAULT
(Service Message)

Message Code:

B3-007011

Associated CAS:

None

Reporting LRU: L AOA SENSOR
System Description: 27-32-00
Schematic Diagram: 27-32-00
Wiring Diagram: 27-32-09

Message Description:

Loss of redundant resolver outputs from L AOA reported by SPC A.

Possible Causes:

  • Angle-Of-Attack Sensor (LH) (A141)
  • Stall Protection Computer (SPC) (A178)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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
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
Functional Test of the Angle-of-Attack Sensor AMM 27-32-09-720-801
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 between SPC connector A178AP1 and Left AOA sensor connector A141P1. Replace/repair as required.

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

  3. Swap AOA sensors.

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

  4. Replace SPC.
  5. Do close out.

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