07/15/25
Message Overview:
Message Name:
L WINDSHIELD TEMP CONTROL
Message Code:
3040000IN
Associated CAS:
| Reporting LRU: | Left Windshield and Side Window Temperature-Controller (WTC) |
| System Description: | 30-41-00 - Windshield and Side Window Anti-Icing |
| Schematic Diagram: | 30-41-00 [ Global Express ] [ G5000 ] [ Global XRS ] - Windshield Temperature Control System - Electrical Schematic |
| Wiring Diagram: | 30-41-01 [ Global Express ] [ G5000 ] [ Global XRS ] - Windshield and Side Window Anti-Icing - Temperature Control (Left) |
Message Description:
An internal failure has been detected in the Left Windshield Temperature Controller (L-WTC), accompanied by loss of heating to the left windshield and left window.
NOTE: Troubleshoot accordingly to the Label that triggered the message: first message based on 357 (17, 18,19) and second on 360 (14, 15, 16). Inhibited during Take-off and Landing.
Possible Causes:
- Left Windshield Temperature Controller (WTC) (A164)
- Left Windshield (HR9)
- Left Side Window (HR8)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin:
- AW700-30-0463 - No Fault Found (NFF) initiative - Windshield Temperature Controller (WTC)
- Windshield Troubleshooting Report to help with windshield temperature controller NFF
Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None
Flight Operation Notifications Manual (FONM): None
Quick Links:
| Standard Aircraft Configuration for Maintenance | [ G5000 ] [ Global Express ] [ Global XRS ] AMM12-00-00-867-801 |
| Connect Electrical Power to the Aircraft | [ G5000 ] [ Global Express ] [ Global XRS ] AMM24-00-00-861-801 |
| Electrical/Electronic Safety Precautions | [ G5000 ] [ Global Express ] [ Global XRS ] AMM24-00-00-910-801 |
| Electrostatic Discharge Safety Precautions | [ G5000 ] [ Global Express ] [ Global XRS ] AMM24-00-00-910-802 |
| Standard Aircraft Configuration for Maintenance | [ G5000 ] [ Global Express ] [ Global XRS ] AMM12-00-00-867-801 |
| 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 Data Acquisition Units (DAU) | [ G5000 ] [ Global Express ] [ Global XRS ] AMM31-42-01-000-801 |
| Installation of the Data Acquisition Units (DAU) | [ G5000 ] [ Global Express ] [ Global XRS ] AMM31-42-01-400-801 |
Troubleshooting Recommendations:
- Disconnect the left WTC and inspect connectors and contacts.
- If defects are found, rectify as required.
- If no defects are found, reconnect the WTC and continue with next step.
- Perform a ground Functional Test.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Interchange the left WTC with the right WTC
- If confirmed faulty, replace defective WTC and do close out.
- If fault still present on same side, continue with next step.
- Carry out a resistance check of the windshield/side window.
NOTE: The message could be posted for either the windshield or side window, the measurement need to be done on both. - Measure the Heater resistance between T1 and T2 of both the windshield and side window. 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).
- If resistance within range, continue with next step.
- If resistance out of range, replace affected windshield/side window and do close out.
- Measure the temperature sensor resistance between S1 and S2 of both the windshield and side window (refer to Windshield and Side Window Temperature Sensor Resistance Chart).
- If resistance within range, go to step 8..
- If resistance out of range, continue with next step.
- Connect spare temperature sensor on left windshield or side window (HR9/HR8).
- Do close out.