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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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Quick Links

04/02/21

Message Overview:

Message Name:

FLAP INPUT FAIL

Message Code:

B3-648531

Associated CAS:

TAWS FLAPS OFF
(Status)

Reporting LRU: TAWS MARK V
System Description: 34-42-00
Schematic Diagram: 34-42-00
Wiring Diagram: 34-42-01

Message Description:

TAWS is indicating a flaps input fault.

Possible Causes:

  • Terrain-Avoidance Warning System (TAWS) Computer (A34)
  • FLAP Lever (A120)
  • TAWS/Landing Gear Control-Panel (PL10)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the FLAP Lever AMM 27-51-01-000-801
Installation of the FLAP Lever AMM 27-51-01-400-801
Removal of the TAWS/LANDING GEAR Control-Panel AMM 34-42-09-000-801
Installation of the TAWS/LANDING GEAR Control-Panel AMM 34-42-09-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset TAWS (CB2-A6) circuit breaker or push in the TAWS TEST/RESET switch on the center pedestal.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  2. Verify the operation of the Flap Override Input circuitry as per drawing. Repair/replace as required.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.
      NOTE: The TAWS FLAP switch will provide, when pushed in (light ON), a ground to pin C9 of TAWS computer connector A34BP1. The Flap lever will provide a ground when selected at 30 degree at the same pin, since both are wired in parallel through Junction Box 2.

  3. Replace the TAWS computer.
  4. Do close out.

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