L ENG ANTI-ICE FAIL (Caution)

The amber 'L ENG ANTI-ICE FAIL' caution CAS message is set when the Engine Anti-Ice is set to ON and the pressure decreases to less than 9.50 psig (65.50 kPa) in the system. The message will go out of view when the pressure increases above 13 psig (89.63 kPa). This indicates bleed air pressure to the respective Nacelle is too low for effective anti-icing.

Bleed air comes from the Engine High Pressure (HP) Bleed Port. Hot bleed air goes through Anti-Ice Tubes to an Annular Piccolo Tube in the Nacelle Air Intake Lip. The Anti-Ice Valve pneumatically controls the bleed air pressure in the Nacelle Anti-Ice System at a nominal 45 psig (310.26 kPa). The Anti-Ice Dual Pressure-Switch monitors the pressure in the Anti-Ice Tube. (MCID 1309).

• Left Protection Printed Circuit Board (PCB) (Left DC Power Center Printed Circuit Board 1 (L DCPC PCB))
• Anti-Ice Panel (PL19) Left Nacelle (L NAC) Anti-Ice Switch (SDS5)
• Anti-Ice Differential Pressure Switch
• Left Nacelle Anti-Ice Solenoid (V01)
• Left Full Authority Digital Engine Control Channel A (L FADEC A) System (A41)
• Left Full Authority Digital Engine Control Channel B (L FADEC B) System (A43)
• TT2 Heater (A45)
• TT2 Sensor Probe
• W1 Engine Harness
• W3 Engine Harness
• W4 Engine Harness
• W5 Engine Harness
• W6 Engine Harness
• Left Nacelle (L NAC) SB (CB1-E11)
• Circuit Breaker (CB1-A13) Left Full Authority Digital Engine Control Channel A (L FADEC CH A)
• Circuit Breaker (CB2-A13) Left Full Authority Digital Engine Control Channel B (L FADEC CH B)

Advisory Wire/Service Bulletin:

• AW300-72-0348 - AS907 Engine Diffuser Seal and Anti-Ice Valve
• AW300-30-0400 - Thermal Anti-Ice Valve (TAIV)
• Honeywell SIL D202208002772 - AS907 Engine Thermal Anti-Ice Valve (TAIV) PN WBG3020G103-003
• SB 350-76-002 - MODIFICATION – ENGINE CONTROLS – UNCONTROLLABLE HIGH THRUST – EASA RETRO-FIT

Forum Articles/Infoservice/Newsletter: None

NOTE:

• The ECU Engine Harness can be found in the SmartPubs, 71-50-05-01 - ECU A Electrical Harness (LH).

1. Interrogate the MDC as follows:

   1. On the cursor control panel (CCP), ensure the toggle switch is to the right and select Anti-Ice, ECS and Fuel buttons simultaneously. The MDC main menu should now be displayed on Display Unit 3.
   2. 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 Message History and locate the air condition fault logged.
   3. Select the MDC fault from the drop down below to provide additional information to assist in troubleshooting:
      Select MDC Fault MessageB3-302142 - ANTI-ICE COMMAND 1A [ANTI-ICE PANEL]B3-302144 - ANTI-ICE COMMAND 1B [ANTI-ICE PANEL]B3-302137 - A/I PRESSURE SENSOR 4 [L ENG AI PRES]B3-302152 - A/I CONTROL VALVE 4 [L ENG AI VALVE]B3-302154 - A/I CONTROL VALVE 5 [L ENG AI VALVE]B3-302157 - A/I CONTROL VALVE 6 [L ENG AI VALVE]

2. Do close out.