737 MAX Flight Crew Operations Manual
Anti-Ice, Rain -
Controls and Indicators
MN-FLT-OH-201
3.10.5
1
Thermal Anti–Ice Indications
Illuminated –
• Green – cowl anti–ice valve(s) open
• Amber – cowl anti–ice valve is not in position indicated by related
engine anti–ice switch.
Wing Anti–Ice Panel
1
Wing VALVE Lights
Illuminated (amber) –
• momentary – related wing anti–ice valve is in transit
• steady – wing anti–ice valve position disagrees with related WING
ANTI–ICE switch position.
Extinguished – related wing anti–ice valve is closed (switch OFF), or related wing
anti–ice valve is open (switch ON).
2
WING ANTI–ICE Switch
OFF – wing anti–ice control valves are closed.
ON (in the air) –
• wing anti–ice control valves are open
• stick shaker logic is set for icing conditions.
Note:
Stick shaker logic remains set for icing conditions for the remainder of
the flight, regardless of subsequent WING ANTI–ICE switch
position.
WING ANTI-ICE
OFF
ON
L VALVE
R VALVE
FORWARD OVERHEAD PANEL
1
2
March 1, 2021