Nacelle Anti-Ice Switches (1, 2, 3, 4)
The valve on the associated engine opens if bleed air pressure is available. Opens Pressure Regulating Valve (PRV) unless PRV has been closed by:

• High pressure bleed valve failed in the open position.
• A prior or present bleed air overheat.
• Start valve opening.
• Valve Light - Indicates Nacelle Anti-Ice valve position disagrees with switch position.

Wing Anti-Ice Switch
In flight, opens left and right wing Anti-Ice valves when bleed air pressure is available to supply bleed air to the wing leading edges:

• Valve Light - Indicates either left or right wing Anti-Ice valve disagrees with switch position.

Ice & Rain Controls
Spray a timed application of Rain repellent on the associated forward windshield.

Window HEAT Switches
Turn on controlled Anti-Ice and defogging heat to the associated window.

• INOP Light - Indicates Heat to the associated windows is off due to a controller fault, overheat, or the switch being off.

Wiper Selectors

• OFF - Turn off and stow the associated wiper.
• LOW - Operate wiper at Low speed.
• HIGH - Operate wiper at High speed.

WindShield Washer Switches

• ON - Applies Washer fluid to the respective window. Use wiper after initial application.