Anti-Ice Components Diagram
ELEVATOR PITOT PROBES (2 PLACES)
FLIGHT DECK 
 WINDOWS 
WINDOW HEAT 
WINDSHIELD
 WIPERS 
PITOT PROBES TEMPERATURE PROBE  ENGINE COWL LIP  LEADING EDGE SLATS 
(3 PLACES) 
ALPHA VANES 
(2 PLACES) 

Copyright . The Boeing Company. See title page for details.
Anti-Ice, Rain -System Description 737 Flight Crew Operations Manual

Flight Deck Window Heat
YA613 - YC154, YK101 - YK104
Flight deck window numbers 1, 2, 4 and 5 consist of glass panes laminated to each
side of a vinyl core. Flight deck window number 4 has an additional vinyl layer
and acrylic sheet laminated to the inside surface. Flight deck window number 3
consists of two acrylic panes separated by an air space.

YA613 - YC154, YK101 - YK104
A conductive coating on the outer glass pane of window numbers 1 and 2 permits
electrical heating to prevent ice build–up and fogging. A conductive coating on
the inner glass pane of window numbers 4 and 5 permits electrical heating to
prevent fogging. Window number 3 is not electrically heated.

YD651 - YD655
Flight deck window numbers 1 and 2 consist of glass panes laminated to each side
of a vinyl core. Flight deck window number 3 consists of two acrylic panes
separated by an air space.

YD651 - YD655
A conductive coating on the outer glass pane of window numbers 1 and 2 permits
electrical heating to prevent ice build–up and fogging. Window number 3 is not
electrically heated.

YC411, YC413
Flight deck windows consist of glass panes laminated to each side of a vinyl core.
Flight deck window number 4 has an additional vinyl layer and acrylic sheet
laminated to the inside surface.

YC411, YC413
A conductive coating on the outer glass pane of window numbers 1 and 2 permits
electrical heating to prevent ice build–up and fogging. A conductive coating on
the inner glass pane of window numbers 3, 4 and 5 permits electrical heating to
prevent fogging.

Flight Deck Window Heat Operation
YA613 - YC154, YK101 - YK104 The FWD WINDOW HEAT switches control heat to window No. 1. The SIDE WINDOW HEAT switches control heat to window number 2, 4, and 5.
YA613 - YC154, YK101 - YK104 Temperature controllers maintain window numbers 1 and 2 at the correct temperature to ensure maximum strength of the windows in the event of bird impact. Power to window numbers 1 and 2 is automatically removed if an overheat condition is detected. A thermal switch located on window 5 opens and closes to maintain the correct temperature of window numbers 4 and 5.
Copyright . The Boeing Company. See title page for details.
3.20.2  June 1, 2005

Anti-Ice, Rain -System Description 737 Flight Crew Operations Manual
YD651 - YD655 The FWD WINDOW HEAT switches control heat to window No. 1. The SIDE WINDOW HEAT switches control heat to window numbers 2.
YD651 - YD655 Temperature controllers maintain window numbers 1 and 2 at the correct temperature to ensure maximum strength of the windows in the event of bird impact. Power to window numbers 1 and 2 is automatically removed if an overheat condition is detected.
YC411, YC413 The FWD WINDOW HEAT switches control heat to window number 1. The SIDE WINDOW HEAT switches control heat to window numbers 2, 3, 4 and 5.
YC411, YC413 Temperature controllers maintain windows numbers 1 and 2 at the correct temperature to ensure maximum strength of the windows in the event of bird impact. Power to window numbers 1 and 2 is automatically removed if an overheat condition is detected. Thermal switches, located on window numbers 3 and 5, open and close to maintain the correct temperature of window numbers 3, 4, and 5.
Copyright . The Boeing Company. See title page for details.

Anti-Ice, Rain -System Description

Flight Deck Window Heat Schematic
YC411, YC413
OVERHEAT 
ON 

Copyright . The Boeing Company. See title page for details.
3.20.4  June 1, 2005

Anti-Ice, Rain -System Description 737 Flight Crew Operations Manual
YA613 - YC154, YK101 - YK104
OVERHEAT 
ON 

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

Anti-Ice, Rain -System Description 737 Flight Crew Operations Manual

YD651 - YD655
OVERHEAT 
ON 

Windshield Wipers
The rain removal system for the forward windows consists of windshield wipers and a permanent rain repellent coating on the windows.
CAUTION: Windshield scratching will occur if the windshield wipers are operated on a dry windshield.
Probe and Sensor Heat
YA686 - YA809, YD651 - YD655 Pitot probes, the total air temperature probe and the alpha vanes are electrically heated. Static ports are not heated.
　
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