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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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03/25/21

Message Overview:

Message Name:

INTERNAL FAULT

Message Code:

B3-007991

Associated CAS:

None

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

Message Description:

Internal failure indicated in TAWS. The ARINC Word with a bit set will help analyze internal problem. Internal fault will set when any of these bits set. Bits 19-29 in 351 label or bits 11-15 in 355 label.

Possible Causes:

  • Terrain-Avoidance Warning System (TAWS) Computer (A34)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 2
  2. Comp Id = A034
  3. {Term Definitions}

    1. TAWS1-9 XX 351 00 OR'D XXXT-TTTT TTTT-TTXX XXXX-XXXX 351: 19-29; MISC FAIL CONDITIONS
    2. TAWS1-10 XX 355 00 OR'D XXXX-XXXX XXXX-XXXX XTTT-TTXX 355: 15&14&13&12&11;INT FAULTS

Quick Links:

Removal of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-000-801
Installation of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-400-801
Removal of the Terrain-Avoidance Warning System (TAWS) Computer AMM 34-42-01-000-802
Installation of the Terrain-Avoidance Warning System (TAWS) Computer AMM 34-42-01-400-802
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Internal failure indicated in TAWS. The ARINC Word with a Bit set will help analyze internal problem. Internal fault will set when any of these bits set. Bits 19-29 in 351 label or bits 11-15 in 355 label.
  2. Replace TAWS.

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