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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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06/22/21

Message Overview:

Message Name:

UNABLE TO POWER AIRCRAFT WITH EXTERNAL AC

Message Code: 244OBS001
Effectivity: All
System: Electrical Power
System Description: 24-40-00
Schematic Diagram: 24-41-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 24-41-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

With an external Ground Power Unit connected to the aircraft and energized, EXT AC cannot be energized.

Possible Causes:

  • Ground Power Unit (GPU)
  • AC Power Center (ACPC) (A54)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Connect Electrical Power to the Aircraft AMM 24-00-00-861-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Remove the Electrical Power from the Aircraft AMM 24-00-00-861-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Electrical/Electronic Safety Precautions AMM 24-00-00-910-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test (Cycling) of Thermal Circuit Breakers AMM 24-00-00-710-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Connect and Energize External AC Power AMM 24-41-00-861-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Remove External AC Power AMM 24-41-00-861-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of the AC External-Power Receptacle AMM 24-41-01-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of the Line Current Transformer AMM 24-41-05-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Make sure the Ground Power Unit (GPU) is energized and supplying power.
  2. Access the ACPC thermal Circuit Breaker (CB) front panel.
  3. Make sure EXT AC INTERLOCK (CB-A9) is set to IN.

    1. If the CB is set to IN, continue with next step.
    2. If the CB was set to OUT, set the CB back to IN and do close out.

  4. Cycle the CB. Is the fault resolved?

    1. If YES, do close out.
    2. If NO, continue with next step.

  5. Interchange the GPU with another GPU if available. Is the fault still present?

    1. If YES, continue with next step.
    2. If NO, replace defective GPU.

  6. Perform troubleshooting in observed fault "247OBS003 - ELECTRICAL SYSTEM TROUBLESHOOTING VIA EMS CDU SIGNBOARD"
  7. Do close out.

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