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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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03/11/19

Message Overview:

ASCB FAIL
(Caution)

DDG Reference: None
Pilot Action (QRH): ABNORM 12-4
System Description: 31-44-00
Schematic Diagram: 31-44-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 31-44-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

The ASCB member system cannot monitor, transmit, or receive data.

NOTE: For this condition, all AFCS functions and most flight-compartment instruments do not operate and/or have no displays.

Possible Causes:

  • All Primary and Secondary busses in the ASCB System
  • ASCB Isolation Couplers
  • ASCB Termination Resistors
  • All Three Bus Controllers in the IAC System

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

For in depth ASCB BUS troubleshooting recommendations and test equipment detail, refer to the ASCB Fault Isolation Guide.

Quick Links:

Removal of the Isolation Couplers AMM 31-44-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Isolation Couplers AMM 31-44-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of the Digital Bus System AMM 31-44-00-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Integrated Maintenance Test (IMT) Fault Code Look-up AMM 45-45-00-970-826 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10[ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Select related CAIMS message below:

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