background
x
loader
Troubleshooting
arrow By ATA By Message Color By Observed Faults By CAIMS By Tips

Select color for CAS message that you wish to troubleshoot

(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.

This page includes :

For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

06/27/19

Message Overview:

Fault Message:

GCU3 [ROTOR DIODE SENSE]

Fault Code:

2423242LPS

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:

Generator Control Unit (GCU) 3 has detected an internal failure related to the Rotor Diode Sensing Circuit and, consequently Generator 3 trips off-line. The Rotor Diode/Main Rotor Assembly is an integral part of the Generator and provides the excitation voltage to the Main Stator Alternator of the Generator. A failed Rotor Diode, within the Rotor Diode/Main Rotor Assembly, is indicated by excessive ripple voltage on the Generator output voltage.

Possible Causes:

  • Generator Control Unit (GCU) 3 (A58)

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 3.
    NOTE: Use PMAT to monitor the fault on GCU.
  2. Do close out.
    gcu_positions

Registered and/or unregistered trademarks of Bombardier Inc. or its subsidiaries. © 2015 Bombardier Inc. All rights reserved.