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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:

NO L-GP-5 BUS INPUT

Message Code:

B3-008001

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:

L-GP-5 bus data absent at TAWS and NOT A-DCU or B-DCU; TAWS not in test.

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# = 12
  2. Comp Id = A034
  3. {Term Definitions}

    1. TAWS1-3 XX 350 00 EXCT XXXX-XXXX XXXX-XXXX XXXX-XTXX 350: 11;NO L-GPBUS-5 INPUT
    2. TAWS1-8 XX 350 00 EXCT XTFX-XXXX XXXX-XXXX XXXX-XXXX 350: 31&!30;FUNCTIONAL TEST
    3. DCU2-3 2X 340 10 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 340: 14;NO L-GP-5 BUS INPUT
    4. DCU1-3 1X 340 01 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 340: 14;NO L-GPBUS-5 IN

Quick Links:

Removal of the Adaptive Flight-Display Unit AMM 31-61-01-000-801
Installation of the Adaptive Flight-Display Unit AMM 31-61-01-400-801
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. Suspect a failed TAWS input, or wiring.

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