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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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For AOG assistance contact:

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Quick Links

04/02/21

Message Overview:

Message Name:

SELF TEST INVALID

Message Code:

B3-642517

Associated CAS:

None

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

Message Description:

Self-test discrete error.

Possible Causes:

  • Terrain-Avoidance Warning System (TAWS) Computer (A34)
  • SYSTEMS TEST Control Panel
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the SYSTEM TEST Control-Panel AMM 31-52-25-000-801
Installation of the SYSTEM TEST Control-Panel AMM 31-52-25-400-801
Removal of the Terrain-Avoidance Warning System (TAWS) Computer AMM 34-42-01-000-801
Installation of the Terrain-Avoidance Warning System (TAWS) Computer AMM 34-42-01-400-801
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. Get access to the front panel of the TAWS computer and inspect the self-test switch. Un-latch the switch if it is stuck.

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

  3. Operate the TAWS TEST/RESET Switch on the center pedestal and confirm it is operating as per drawing. Repair/replace as required.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.
      NOTE: When the TAWS TEST/RESET switch is pushed it provides a ground to the TAWS computer connector A34BP1 pin A9.

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

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