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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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For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

06/25/19

Message Overview:

Fault Message:

GCU1 [PROG PIN 1 SENSE]

Fault Code:

2421216LPS

Associated CAS:

GEN 1 FAIL
(Advisory)

Reporting LRU: Generator Control Unit (GCU) 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:

Generator Control Unit (GCU) 1 has detected an internal failure related to its pin 1 programming sensing circuit consequently Generator 1 trips off-line. GCU uses 4 programming pins (0, 1, 2 and PAR (parity)) to determine its position (GCU1, GCU2, GCU3, GCU4, Auxiliary Power Unit Generator Control Unit (APUGCU)). The GCU uses the odd parity system to determine if the programming pins are valid.

Possible Causes:

  • Generator Control Unit (GCU) 1 (A56)

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 swap GCU 1, GCU 4 and APU GCU into position 2 or 3 (for troubleshooting only).

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

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