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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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09/06/19

Message Overview:

Fault Message:

IRS/WRG/WX RTA FAULT (33B)

Fault Code:

3440026WX

Associated CAS:

None

Reporting LRU: Weather Radar System
System Description: 34-41-00
Schematic Diagram: 34-41-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 34-41-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]
34-45-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]
34-45-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

Weather Radar Transceiver (RTA) has detected incorrect altitude data from either Inertial Reference Unit (IRU). Amber FAIL legend and fault code 33 show in Multi-Function Display (MFD) status window. Crew may notice ALT mode is unavailable.

Possible Causes:

  • Inertial Reference Unit (IRU) 1 (A32)
  • Inertial Reference Unit (IRU) 2 (A33)
  • Weather Radar (WXR) Receiver/Transmitter (R/T) (A125)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

The FAIL legend and fault codes show on the MFD status window only when the WXR system is in TST (Test) mode and an active fault has occurred.

NOTE:

  • RTA uses first IRU that provides valid data. If RTA detects failure of attitude data from one IRU, it will switch to the other source
  • There is a delay of up to 4 minutes for some faults to display. Therefore allow system in test mode for significant time to display all active faults

Quick Links:

Removal of the Weather Radar Receiver/Transmitter AMM 34-41-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Weather Radar Receiver/Transmitter AMM 34-41-01-400-801 [ 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. Make sure that IRUs were aligned on ATT mode prior to TST.
  2. Perform a wiring check for open or short circuit to ground between WX RTA (A125P1), IRU 1 (A32BP1), and IRU 2 (A33BP1).

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

  3. Power IRUs one at a time and monitor code 33B to determine defective IRU. (The suspected IRU does not remove code 33B).

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

  4. Replace defective IRUs.

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

    NOTE: Use IRU 3 for swapping if spare IRU is not available.

  5. Replace WXR R/T.
  6. Do close out.

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