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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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06/25/19

Message Overview:

Fault Message:

GCU2 [VOLTAGE REGULATOR]

Fault Code:

2422247LPS

Associated CAS:

None

Reporting LRU: Generator Control Unit (GCU) 2
System Description: 24-21-00
Schematic Diagram: 24-21-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 24-21-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

An internal Generator Control Unit (GCU) 2 Voltage Regulator fault, detected by continuous monitoring, has caused the Generator output voltage to exceed 120 VAC while remaining below the generator trip threshold. This fault should be evident on the AC synoptic page while active.

Possible Causes:

  • Generator Control Unit (GCU) 2 (A57)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

A GCU patch cable (GSE REF # 24X-24-02) can be used to swap GCU 1, GCU 2, GCU 3, GCU 4 and the APU GCU into a different position (for troubleshooting only). You can monitor the GCU faults in CAIMS via the active faults page.

Quick Links:

Removal of the Generator Control Units (GCU) AMM 24-24-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Generator Control Units (GCU) AMM 24-24-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Remove power from the A/C completely. Apply power to the A/C. Is the fault still present?

    1. If YES, continue with next step.
    2. If NO, monitor for failure and do close out.

  2. Replace GCU 2.
  3. Do close out.

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