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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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09/05/19

Message Overview:

Fault Message:

IRS 3 TEMP / COOLING FAULT

Fault Code:

3440023IR

Associated CAS:

IRS 3 NO ALIGN
(Advisory)

Reporting LRU: Inertial Reference Unit (IRU) 3
System Description: 34-45-00
Schematic Diagram: 34-45-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 34-45-03 [ 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 System (IRS) 3 Cooling Fan
  • Inertial Reference System (IRS) 3 Cooling Fan Filter
  • Inertial Reference Unit (IRU) 3 (A34)

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 3 cooling fan.

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

  2. Perform a visual inspection of the fan filter for Pull the tab on the filter, remove the filter from the fan and visually inspect the filter.

    1. If the filter shows sign of degradation, proceed with the replacement of the cooling fan filter and do close out.
    2. If the filter is dirty, continue with next step.

  3. Proceed with the cleaning as follows:

    • Vacuum the filter using a standard commercial vacuum cleaner or clean the filter using compressed air at a pressure not exceeding 30 psi
    • Wash the filter in a mild detergent solution and rinse with water. Temperature of the detergent solution or water shall not exceed 140°F. Chlorine solutions should not be used. Allow the filter to dry and reinstall
    • Allow the filter to dry and reinstall
      NOTE: If during the cleaning procedure the filter shows signs of degradation, proceed with the replacement of the filter.

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

  4. Replace IRU 3.
  5. Do close out.

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