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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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06/26/19

Message Overview:

Fault Message:

GEN3 OVERFREQUENCY FAULT

Fault Code:

2423112LPS

Associated CAS:

GEN 3 FAIL
(Advisory)

Reporting LRU: Generator Control Unit (GCU) 3
System Description: 24-21-00
Schematic Diagram: 24-21-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 24-21-03 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

An over-frequency failure signal is given when the line frequency of the Variable Frequency Generator (VFG) (Permanent Magnet Generator (PMG) frequency) is more than 629 ± 1 Hz.

Possible Causes:

  • Generator Control Unit (GCU) 3 (A58)
  • Variable Frequency Generator (VFG) 3 (G3)

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.

NOTE:

  • When generator is switched off, two reset attempts can be made. If NOT successful, reset will only be possible with a complete power cycle
  • The frequency necessary to reset must be at least 5 Hz less than the frequency which caused the failure

Quick Links:

Removal of the Variable Frequency Generators (VFG) AMM 24-21-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Variable Frequency Generators (VFG) AMM 24-21-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
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. Swap the GCU 3 with GCU 2 (physically or using the GCU patch cable).
    NOTE: Use PMAT to monitor the fault on GCU.

    1. If system checks are good, replace GCU 3 and do close out.
    2. If fault remains, continue with next step.

  2. Replace VFG 3.
  3. Do close out.

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