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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 SOVS CLSD
(Status)

DDG Reference: None
Pilot Action (QRH): STATUS-1
System Description: 49-70-00
Schematic Diagram: 49-61-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 49-61-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

APU SOV CLSD (Status) shows on the EICAS as an indication that the APU SOV is closed. This message comes on when the APU engine fire-extinguishing-system is manually armed from the flight compartment or a failure in the circuit.

Possible Causes:

  • Auxiliary Power Unit (APU) FIRE Extinguishing Switch
  • Junction Box 4 (JB4) Relay (K16)
  • Fuel Management Quantity Gauging Computer (FMQGC) (A47)
  • Auxiliary Power Unit (APU) Shut-off Valve (SOV)
  • 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 ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [Global XRS ]

Troubleshooting Recommendations:

  1. Perform wiring check between Fire Switch, JB4, FMQGC, and APU FADEC.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  2. Replace APU SOV.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  3. Replace FADEC.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  4. Replace FMQGC.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  5. Replace APU FIRE Extinguishing Switch.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  6. Replace JB4.
  7. Do close out.

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