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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:

NO FLAP ANALOG TO SPC

Message Code:

B3-007957

Associated CAS:

STALL PROTECT FAULT
(Advisory)

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

Message Description:

The flap position analog signal from the Left and Right Flaps Sensors is out-of-range or declared invalid by the FCU.

Possible Causes:

  • Flap Control Unit (FCU) (A124)
  • Stall Protection Computer (SPC) (A178)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-27-0058 - "STALL PROTECT FAIL" Nuisance CAS Message (20501 - 20999)

Forum Articles/Infoservice/Newsletter: None

If Flap Control Unit (FCU) PN: 2257A0000-02 is installed, reset procedure included in AW300-27-0058 may clear the fault.

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 Flap Control Unit (FCU) AMM 27-51-05-000-801
Installation of the Flap Control Unit (FCU) AMM 27-51-05-400-801
Operational Test of the Flap Control Unit (FCU) AMM 27-51-05-710-801
Electrical Rigging of the Flap System AMM 27-52-00-820-801
Removal of the Flap Position Sensor AMM 27-52-17-000-802
Installation of the Flap Position Sensor AMM 27-52-17-400-802
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. Check in the MDC in the current faults and fault history pages for problems related to FLAP CONTROL UNIT.

    1. If one of the listed fault is found, continue with the troubleshooting of this failure.
    2. If none of the listed faults is recorded in the MDC, continue with next step.

  2. Reset the following circuit breakers.

    STALL R PWR CB2-B10
    STALL L PWR CB1-B10
    FLAP R IND CB2-B12
    FLAP L IND CB1-B13
    FLAP CTRL CB1-B14

  3. Reset the FCU by pressing the FCU reset button on the MAINTENANCE TEST control panel.

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

  4. Do wiring check between FCU connectors A124AP1 / A124BP1 and SPC connectors A178AP1 / A178BP1. Repair/replace as required.

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

  5. Replace SPC.

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

  6. Replace FCU.
  7. Do close out.

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