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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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03/17/26

Message Overview:

Message Name:

A/I CONTROL VALVE 5

Message Code:

B3-302154

Associated CAS:

L ENG ANTI-ICE FAIL
(Caution)

L ENG A/ICE FAIL ON
(Advisory)

Reporting LRU: L ENG AI VALVE
System Description: 30-21-00 - Engine Nacelle Anti-ice System
Schematic Diagram: SSM 75-10-00-101 - Engine Anti-Icing
Wiring Diagram: 75-10-01 - Engine Nacelle Anti-Ice (LHS) - ALL

Message Description:

Left engine anti-ice control valve fault 5.

[MCID 1207]
Anti-Ice Control Valve 5.
A mechanical failure of the engine anti-ice control valve was sensed.

Possible Causes:

  • Anti-ice Valve
  • Wiring Harness (W6)
  • Wiring Harness (W3)
  • 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

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

Flight Operation Notifications Manual (FONM): None

NOTES:

  • 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:

General Setup for Maintenance
Standard Aircraft Configuration for Maintenance AMM 12-00-00-867-803
Connect Electrical Power to the Aircraft AMM 24-00-00-861-801
Remove Electrical Power from the Aircraft AMM 24-00-00-861-802
Electrical/Electronic Safety Precautions AMM 24-00-00-910-801
Electrostatic Discharge Safety Precautions AMM 24-00-00-910-802
Maintenance Tasks
Component Location AMM 30-21-00-992-801
Operational Test of the Nacelle Anti-Ice System AMM 30-21-00-710-801
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 Right Engine AMM 71-50-05-400-803
Removal of the Engine Electronic Control Unit (ECU) AMM 76-10-05-000-801
Installation of the Engine Electronic Control Unit (ECU) AMM 76-10-05-400-801

Troubleshooting Recommendations:

  1. MCID 1207 task present, isolate per the Light Engine Maintenance Manual TASK 72-00-00-810-204.
  2. 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.

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