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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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02/26/21

Message Overview:

Message Name:

NO L-FCU-1 BUS TO SPC

Message Code:

B3-006683

Associated CAS:

FLAPS FAULT
(Advisory)

Reporting LRU: FLAP CTRL UNIT
System Description: 27-51-00
Schematic Diagram: 27-52-00
Wiring Diagram: 27-52-33

Message Description:

No Flap Control Unit (FCU) ARINC Signal at Stall Protection Computer (SPC).

Possible Causes:

  • Flap Control Unit (FCU) (A124)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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
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 circuit breakers CB1-B13 FLAP L IND, CB1-B14 FLAP CTRL and CB2-B12 FLAP R IND/CTRL.

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

  2. Re-rack FCU.

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

  3. Do wiring check of M-FCU-1 and M-FCU-2 from FCU to SPC.

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

  4. If fault remains, replace FCU.
  5. Do close out.

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