Copyright . The Boeing Company. See title page for details.
3.10.2   April 28, 2000

Anti-Ice, Rain -Controls and Indicators
Probe Heat Panel
YA613 - YA687, YA801 - YK104
CAPT PITOT 
PITOT L ELEV 
VANE L ALPHA 
TEMP PROBE 

PITOTF/O 
R ELEV PITOT 
VANE R ALPHA 
PITOT AUX 

YA721, YA722
CAPT PITOT 
PITOT L ELEV 
VANE L ALPHA 
TEMP PROBE 

PITOTF/O 
R ELEV PITOT 
VANE R ALPHA 
PITOT AUX 

Probe Heat Lights
Illuminated (amber) – related probe not heated.
Note:  If operating on standby power, probe heat lights do not indicate system status.

PROBE HEAT Switches
ON – power is supplied to heat related system.
OFF – power off.

TAT TEST Switch YA721, YA722
Push -Electrical power applied to TEMP PROBE on the ground.
Copyright . The Boeing Company. See title page for details.

Anti-Ice, Rain -Controls and Indicators

Engine Anti–Ice Panel
COWL  COWL 
ANTI-ICE  ANTI-ICE 
COWL VALVE  COWL VALVE 
OPEN  OPEN 

COWL ANTI–ICE Lights
Illuminated (amber) – indicates an overpressure 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 Switches
ON –
.
related engine anti–ice valve is open

.
stick shaker logic is set for icing conditions.

OFF –
.
related engine anti–ice valve is closed

.  
stick shaker logic returns to normal if wing anti–ice has not been used in
flight.

Copyright . The Boeing Company. See title page for details.
3.10.4   July 28, 2000

Anti-Ice, Rain -Controls and Indicators
Thermal Anti–Ice Indication

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

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).

Copyright . The Boeing Company. See title page for details.

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

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.
ON (on the ground) –
.  
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.

Copyright . The Boeing Company. See title page for details.
3.10.6   July 28, 2000
737 Flight Crew 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 . Engine Anti-Ice System

.
Windshield Wipers . Wing Anti-Ice System

.
Probe and Sensor Heat
　
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