WINDOW HEAT Test Switch (spring–loaded to neutral)
OVHT – simulates an overheat condition. PWR TEST – provides a confidence test. Note: Refer to Supplementary Procedures for Window Heat Test procedures.

Window Heat OFF Lights
Illuminated (amber) – window heat is not being applied to selected window(s).
Windshield/Foot Air Controls

WINDSHIELD AIR Controls
PULL – supplies conditioned air to No. 1 windows for defogging.

FOOT AIR Controls
PULL – supplies conditioned air to pilots’ leg positions.
Copyright . The Boeing Company. See title page for details.
3.10.2  December 1, 2000

Anti-Ice, Rain -Controls and Indicators
Windshield Wiper Panel
1  RAIN REPELLENT L PARK 

Rain Repellent Switches
Push – applies measured amount of repellent on related window 1.

Windshield WIPER Selector
PARK – turns off wiper motors and stows wiper blades.
OFF – turns off wiper motors.
LOW – low speed operation.
HIGH – high speed operation.

Anti-Ice, Rain -Controls and Indicators 737 Operations Manual

Pitot Static Heat Panel

As installed
FORWARD OVERHEAD PANEL

Pitot Static Lights
Illuminated (amber) – related probe not heated.

PITOT STATIC Switches
ON – power is supplied to heat related system.
OFF – power off.

TAT TEST Switch
Push (on ground) – power is applied to temp probe.
Copyright . The Boeing Company. See title page for details.
3.10.4  December 1, 2000

Anti-Ice, Rain -Controls and Indicators
Engine Anti–Ice Panel

COWL ANTI–ICE Lights
Illuminated (amber) – indicates an overpressure or overtemperature condition in duct downstream of engine cowl anti–ice valve.

COWL VALVE OPEN Lights
Illuminated (blue) –
.  
bright – related cowl anti–ice valve is in transit, or, cowl anti–ice valve
position disagrees with related ENGINE ANTI–ICE switch position

.
dim – related cowl anti–ice valve is open (switch ON). Extinguished – related cowl anti–ice valve is closed (switch OFF).

ENGINE ANTI–ICE Switch
ON – related engine anti–ice valve opens.
OFF – related engine anti–ice valve closes.

Anti-Ice, Rain -Controls and Indicators

Wing Anti–Ice Panel

FORWARD OVERHEAD PANEL

Wing Anti–Ice VALVE OPEN Lights
Illuminated (blue) –
.  
bright – related wing anti–ice control valve is in transit, or, related wing anti–ice control valve position disagrees with WING ANTI–ICE switch position

.
dim – related wing anti–ice control valve is open (switch ON). Extinguished – related wing anti–ice control valve is closed (switch OFF).

WING ANTI–ICE Switch
OFF – wing anti–ice control valves close.
ON (in flight) – wing anti–ice control valves open.

Copyright . The Boeing Company. See title page for details.
3.10.6   December 6, 2002

Anti-Ice, Rain -Controls and Indicators 737 Operations Manual
ON (on the ground) – on airplanes with ground wing anti-ice –
.  
wing anti–ice control valves open if thrust on both engines is below
takeoff warning setting and temperature inside both distribution ducts is
below thermal switch activation temperature

.  
control valves close if either engine thrust is above takeoff warning
setting or thermal switch is activated in either distribution duct. Switch
remains ON

.  
switch trips OFF at lift–off.

GRD TEST (spring loaded to OFF) – on airplanes with ground test, opens wing anti–ice control valves.
Anti-Ice, Rain -Controls and Indicators 737 Operations Manual

Intentionally
Blank

Copyright . The Boeing Company. See title page for details.
3.10.8  December 1, 2000
737 Operations Manual
Anti-Ice, Rain Chapter 3 System Description Section 20
Introduction
Thermal anti-icing (TAI), electrical anti-icing, and windshield wipers are the systems provided for ice and rain protection.
The anti-ice and rain systems include:
.  
Flight Deck Window Heat . Probe and Sensor Heat

.  
Windshield Wipers . Engine Anti-Ice System

.  
Rain Repellent (inoperative on . Wing Anti-Ice System
some airplanes)

Anti-Ice Components Diagram
　
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