L WING ANTI-ICE FAIL
(Caution)

The amber 'L WING A/I LOW TEMP' caution CAS messages will appear when a low temperature condition is sensed at the wing and no other fail messages from the air system are present. If other failures from the air system are present, the L WING ANTI-ICE FAIL message will overwrite the L WING A/I LOW TEMP message.

• Integrated Air System Controller (IASC1)
• Data Concentrator Unit (DCU) (A14)
• Wing Leading Edge Temperature Sensors
• Left Anti-Ice Valves
• Cross-flow Anti-Ice Valves

Advisory Wire/Service Bulletin:

• AW300-72-0348 - AS907 Engine Diffuser Seal and Anti-Ice Valve

Forum Articles/Infoservice/Newsletter: None

1. Perform AMM to verify the proper operation of the wing leading edge temperature sensors.

   1. If any of the sensors fail the above check, replace the sensor.

2. Entering the system diagnostics LRU tests for IASC 1B and 2B will allow viewing of the wing temperature sensors.

   1. Selecting the wing anti-ice sensor status will bring up the individual temperature sensors.
   2. With wing heat on, the system will try and regulate the inner sensors to 54°C. The AMM has this checked at idle and power settings assuring that the left, right, and cross-flow ANTI-ICE valves operate correctly.
   3. Displayed will be the following parameters on the sub system page:

      1. Left Inboard Leading Edge Temperature °C
      2. Left Outboard Leading Edge Temperature °C
      3. Right Inboard Leading Edge Temperature °C
      4. Right Outboard Leading Edge Temperature °C

   4. Select an MDC Fault Code/Message :B3-007096 - CH A&B FAULT [L I/B TEMP SNSR]B3-008107 - DISAGREE / VALVE CLOSED [WING A/ICE VLV 1]B3-008108 - DISAGREE / VALVE OPEN [WING A/ICE VLV 1]B3-008109 - DISCRETE DISABLE FAIL [WING A/ICE VLV 1]B3-006841 - DISAGREE / VALVE CLOSED [HI PRESS VALVE 1]B3-006842 - DISAGREE / VALVE OPEN [HI PRESS VALVE 1]