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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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04/02/24

Message Overview:

Fault Message:

GCU2 [GLCMON/GLCDMON SENSE]

Fault Code:

2422180LPS

Reporting LRU: Generator Control Unit (GCU) 2
Associated CAS: GEN 2 FAIL (ADVISORY) 
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 ]

Message Description:

Generator Control Unit (GCU) internal monitoring detects a mismatch between the Generator Line Contactor (GLC) Drive signal voltage monitor and the GLC coil voltage monitor.

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 GCUs 1, 4 and 5 into position 2 or 3 (for troubleshooting only).

The GCU NVMs can only be downloaded at position #2 or #3.

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

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

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