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(WARNING)
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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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04/21/22

Message Overview:

Message Name:

APUGCU [VOLTAGE REGULATOR HIGH]

Message Code:

2420098LPS

Associated CAS:

APU GEN FAIL
(Advisory)

Reporting LRU: Auxiliary Power Unit Generator Control Unit (APU GCU)
System Description: 24-22-00
Schematic Diagram: 24-22-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 24-22-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

Auxiliary Power Unit Generator Control Unit (APU GCU) has detected an internal failure related to the Voltage Regulator High Circuit and consequently Auxiliary Power Unit (APU) Generator trips off-line.

Possible Causes:

  • Auxiliary Power Unit Generator Control Unit (APU GCU) (A109)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

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

A GCU patch cable (GSE REF # 24X-24-02) can be used to interchange GCU 1, GCU4 and APU GCU into position 2 or 3 (for troubleshooting only).

Quick Links:

Removal of the APU Generator [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-22-01-000-801
Installation of the APU Generator [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-22-01-400-801
Operational Test of the APU Generator [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-22-01-710-801
Removal of the Generator Control Units (GCU) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-24-01-000-801
Installation of the Generator Control Units (GCU) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-24-01-400-801
Operational Test of the Generator Control Units (GCU) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-24-01-710-801
CAIMS PMAT General Instructions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-801
Access to Active Faults [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-802
Access to Stored Faults [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-803
Access to System Diagnostics [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-804
Safety Precautions - Maintenance Practices - ALL [ G5000 ]  [ Global Express ]  [ Global XRS ] SPM 20-00-01-02
Wire Repair - Maintenance Practices - ALL [ G5000 ]  [ Global Express ]  [ Global XRS ] SPM 20-12-10-02
Electrical Connectors - Description and Operation - ALL [ G5000 ]  [ Global Express ]  [ Global XRS ] SPM 20-20-00-00

Troubleshooting Recommendations:

  1. Replace APU GCU.
    2. NOTE: Use PMAT to monitor the fault on GCU.
  2. Do close out.

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