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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

08/29/19

Message Overview:

Fault Message:

IRS 1 TEMP / COOLING FAULT

Fault Code:

3440003IR

Associated CAS:

IRS 1 OVHT
(Caution)

Reporting LRU: Inertial Reference Unit (IRU) 1
System Description: 34-45-00
Schematic Diagram: 34-45-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 34-45-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

The internal Inertial Reference Unit (IRU) temperature is higher than the maximum permitted limit (approximately 72 °C).

Possible Causes:

  • Inertial Reference Unit (IRU) 1 (A32)
  • Inertial Reference Unit (IRU) 1 Cooling Fan

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Inertial Reference System (IRS)
Cooling Fans		 AMM 21-54-01-000-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Inertial Reference System (IRS)
Cooling Fans		 AMM 21-54-01-400-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Inertial Reference Units (IRU) AMM 34-45-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Inertial Reference Units (IRU) AMM 34-45-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Replace IRU 1 cooling fan.

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

  2. Replace IRU 1.
  3. Do close out.

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