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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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08/16/19

Message Overview:

APU FUEL SOV
(Caution)

DDG Reference: 28-21-04
Pilot Action (QRH): ADVISORY 4-4
System Description: 28-21-00
Schematic Diagram: 28-21-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 28-21-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

When the conditions that follow occur:

  • APU fire handle is pulled or the APU is not on.
  • EICAS shows that the APU feed shut-off valve is open
  • Aircraft is not in a take-off or landing mode.

OR

  • APU fire handle is not pulled and the APU is on.
  • EICAS shows that the APU feed shut-off valve is closed.
  • Aircraft is not in a take-off or landing mode.

Possible Causes:

  • Auxiliary Power Unit (APU) Feed Shut-off Valve (SOV) Actuator
  • DC Power Center (DCPC) / Electrical Management System (EMS)
  • Circuit Card at Junction Box 4 (JB4)
  • Fire Handle
  • Fuel Management and Quantity Gauging Computer (FMQGC)
  • Auxiliary Power Unit (APU) Full Authority Digital Engine (Electronic) Control (FADEC)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Box JB4 AMM 24-00-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Junction Box JB4 AMM 24-00-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the FMQGC AMM 28-41-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the FMQGC AMM 28-41-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the FIRE Handle AMM 26-21-13-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the FIRE Handle AMM 26-21-13-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Full-Authority Digital Engine-Controller (FADEC) AMM 49-61-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Full-Authority Digital Engine-Controller (FADEC) AMM 49-61-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to Active Faults AMM 45-45-00-970-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to Stored Faults AMM 45-45-00-970-803 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [Global XRS ]

Troubleshooting Recommendations:

  1. Using the PMAT, access the Active Faults/Stored Faults as per AMM Tasks.
  2. Select related CAIMS message below:

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