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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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08/22/19

Message Overview:

Fault Message:

GCU_4 INVALID

Fault Code:

3145098DAU

Associated CAS:

None

Reporting LRU: Data Acquisition Unit (DAU)
System Description: 24-21-00
Schematic Diagram: None
Wiring Diagram: None

Fault Description:

Data Acquisition Unit (DAU) is reporting that the Line Replaceable Unit (LRU) is transmitting label 270 with incorrect Source Destination Identifier (SDI) or invalid SSM (failure warning or no computed data). If this fault shows at the same time as an "INACTIVE" fault for the same LRU, ignore this fault because the "INACTIVE" condit.

Possible Causes:

  • Data Acquisition Unit (DAU)
  • Generator Control Unit (GCU) 4 (A59)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

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