05/06/21
Message Overview:
Message Description:
Left engine anti-ice pressure sensor fault 4.
[MCID 1212]
Anti-Ice Pressure Sensor 4.
Detection of a fault in the engine anti-ice pressure sensor.
Possible Causes:
- Anti-ice Differential Pressure Switch
- Wiring Harness (W6)
- Wiring Harness (W4)
- Full Authority Digital Engine Control Unit (FADEC) Electronic Control Unit A (ECU) (A41)
- Full Authority Digital Engine Control Unit (FADEC) Electronic Control Unit B (ECU) (A43)
Troubleshooting Tips:
Advisory Wire/Service Bulletin:
- AW300-36-0008 - "WING ANTI-ICE LEAK" EICAS Message During Climb
Forum Articles/Infoservice/Newsletter: None
- Experience has shown that not turning the WAI OFF after a 'WING ANTI-ICE LEAK' CAS message could lead to an 'ENG THRUST FAULT' CAS message. Refer to the Advisory Wire listed above for more details.
- When Batteries are 'ON' and engines are not running, if WAI is 'ON' while the rotary switch is on 'NORM', the L & R ENG THRUST FAULT CAS message will displayed.
Quick Links:
| Component Location | AMM 30-21-00-992-801 |
| Operational Test of the Nacelle Anti-Ice System | AMM 30-21-00-710-801 |
| Leak Test of the Nacelle Anti-Ice System | AMM 30-21-00-790-801 |
| Removal of the Cowl Anti-Ice Valve | AMM 30-21-01-000-801 |
| Installation of the Cowl Anti-Ice Valve | AMM 30-21-01-400-801 |
| Removal of the Anti-Ice Dual Pressure Switch | AMM 30-21-03-000-801 |
| Installation of the Anti-Ice Dual Pressure Switch | AMM 30-21-03-400-801 |
| General Visual Inspection of the Engine Wiring Harness | AMM 71-50-00-210-802 |
| Removal of the FADEC Electrical Harness from the Left Engine | AMM 71-50-05-000-802 |
| Installation of the FADEC Electrical Harness on the Left Engine | AMM 71-50-05-400-802 |
| Wiring - Maintenance Practices - ALL | SPM 20-12-00-02 |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 |
| Electrical Connectors - Maintenance Practice - ALL | SPM 20-20-00-02 |
Troubleshooting Recommendations:
Interrogate the MDC as follows:
- On the cursor control panel, ensure the toggle switch is to the right and select Anti-Ice, ECS and Fuel buttons simultaneously. Press ENTER. The MDC main menu should now be displayed on Display Unit #3.
- Using the joystick, select Current Faults (if the fault is active) or Aircraft History to research stored faults. From Aircraft History you can then select 'Fault History' and locate the fault. Going into advanced diagnostics will provide an Equation ID for the fault identified.
- Select the MDC fault or Equation ID from the drop down below to get additional information to assist in troubleshooting.
- Check for the following MDC messages displayed with the fault:
- - X-channel bus 1A (MCID 0905),
- - X-channel bus 1B (MCID 0906),
- - X-channel discrete 1A (MCID 0933),
- - X-channel discrete 1B (MCID 0934).
- If any of the above MCID codes are posted, correct the cross channel faults first.
- If none of these fault codes are present, continue with next step.
- Troubleshoot using the following steps for aircraft and engine fault isolation with reference to the Light Engine Maintenance Manual TASK 72-00-00-810-207-A01.