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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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Quick Links

06/25/19

Message Overview:

Fault Message:

GEN1 OPEN CIRCUIT FIELD FAULT

Fault Code:

2421105LPS

Associated CAS:

GEN 1 FAIL
(Advisory)

Reporting LRU: Variable Frequency Generator (VFG) 1
System Description: 24-21-00
Schematic Diagram: 24-21-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 24-21-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

Variable Frequency Generator (VFG) 1 has tripped off-line or will not come on-line.

Possible Causes:

  • Variable Frequency Generator (VFG) 1 (G1)
  • Generator Control Unit (GCU) 1 (A56)
  • Associated Wiring

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 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 ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Swap GCU #1 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 #1 and do close out.
    2. If fault remains, continue with next step.

  2. Disconnect connector GCU No. 1 (A56P1) and VFG No. 1 (G1P1).
  3. Do a resistance check (6.0 to 7.3 ohms at 20° C) between pins B and H on the VFG receptacle G1J1 (VFG side).

    1. If resistance is out of tolerance, go to step 5.
    2. If resistance is within tolerance, continue with next step.

  4. Perform wiring check between GCU 1 and Generator 1 as follows:

    From To Result
    G1P1-H A56P1-J
    G1P1-B A56P1-K

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  5. Replace VFG #1.
  6. Do close out.

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