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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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04/27/20

Message Overview:

Fault Message:

IRU 2/WIRING/SDU

Fault Code:

231005BSC

Associated CAS:

None

Reporting LRU: Satellite Data Unit (SDU)
System Description: 23-13-00
Schematic Diagram: 23-13-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 23-13-09 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

The databus from Inertial Reference Unit (IRU) 2 is detected inactive or faulty.

Possible Causes:

  • Inertial Reference Unit (IRU) 2 (A33)
  • Satellite Data Unit (SDU) (A228)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

AW 700-23-0584 - Honeywell SDU-600 Obsolescence

AW 700-23-0756 - MCS-7000 Obsolescence

SB 700-23-001 - Modification MCS-6000 SATCOM

SB 700-23-043 - Modification MCS-7000 SATCOM

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Satellite Data Unit AMM 23-13-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Satellite Data Unit AMM 23-13-01-400-801 [ 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 ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Disconnect IRU 2 connector A33BP1 and SDU connector A228BP1. Perform a wiring check as follows:

    From To Result
    A33BP1-E5 Ground
    A33BP1-E6 Ground
    A33BP1-E5 A33BP1-E6

    1. If the wiring checks are not good, repair defective wiring as required and do close out.
    2. If the wiring checks are good, continue with next step.

  2. Perform a wiring check as follows:

    From To Result
    A33BP1-E5 A228BP1-C6
    A33BP1-E6 A228BP1-D6

    1. If the wiring checks are not good, repair defective wiring as required and do close out.
    2. If the wiring checks are good, continue with next step.

  3. Swap IRU 2 with IRU 1. Is the fault still present?

    1. If YES, install the IRUs in their original position and continue with next step.
    2. If NO, replace IRU 2 and do close out.

  4. Replace the SDU.
  5. Do close out.

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