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(WARNING)
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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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11/21/25

Message Overview:

Message Name:

L WSHLD HEATER/WIRING [OPEN]

Message Code:

3040017IN

Associated CAS:

L WSHLD HEAT FAIL
(Caution)

Reporting LRU: Left Windshield Temperature Controller (WTC)
System Description: 30-41-00 - Windshield And Side Window Anti Icing
Schematic Diagram: [ G5000 ]  [ Global Express ]  [ Global XRS ] SSM 30-41-00-101 - Windshield Temperature Control System
Wiring Diagram: [ G5000 ]  [ Global Express ]  [ Global XRS ] WM 30-41-01-1_001 - Sheet 1 - Temperature Control (Left) - ALL
[ G5000 ]  [ Global Express ]  [ Global XRS ] WM 30-41-00-1_001 - Sheet 1 - Left Hand Side - ALL

Message Description:

A Left Windshield heater/wiring has been detected OPEN.

  • Heater Current ≥11.07±1.01 A with 33% Heating Level
  • Heater Current ≥19.13±1.74 A with 100% Heating Level

Possible Causes:

  • Left Windshield (HR9)
  • Left Windshield Temperature Controller (WTC) (A164)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW700-30-0463 - No Fault Found (NFF) initiative - Windshield Temperature Controller (WTC)

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

NOTES:

Quick Links:

Removal of the Windshield and Side Window Temperature-Controller [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM30-41-01-000-801
Installation of the Windshield and Side Window Temperature-Controller [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM30-41-01-400-801
Removal of the Windshields [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM56-10-01-000-801
Installation of the Windshields [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM56-10-01-400-801
Wire Repair - Maintenance Practices - ALL [ G5000 ]  [ Global Express ]  [ Global XRS ] SPM20-12-10-02

Troubleshooting Recommendations:

  1. Remove all connectors from the left WTC. Inspect connectors and pins for damage/defects.

    1. If no defects or damage is found, reconnect the WTC connectors and continue with next step.
    2. If defects or damage is found, repair/rectify as required.

  2. Perform wiring checks between Left windshield heater and L WTC.

    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. Measure the Heater resistance. The total resistance of the anti-fog coating when measured between terminal blocks shall be 11.73 Ω -15.87 Ω (at 19°C -29°C).

    1. If resistance within range, go to step 5.
    2. If resistance out of range, continue with next step.

  4. Replace Windshield.

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

  5. Interchange WTCs and replace if necessary.
  6. Do close out.

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