Manual Mode Operation
A green MANUAL Light illuminates with the pressurization mode selector in the MAN position.
Manual control of the cabin altitude is used if both the AUTO and ALTN modes are inoperative. In the MAN mode, the outflow valve position switch is used to modulate the outflow valve by monitoring the cabin altitude panel and valve position on the outflow valve position indicator. A separate DC motor, powered by the DC standby system, drives the outflow valve at a slower rate than the automatic modes. Outflow valve full range of motion takes up to 20 seconds.
Copyright . The Boeing Company. See title page for details.
2.40.8  June 1, 2003

Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.10.1
Window Heat Panel  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.10.1 Windshield/Foot Air Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.10.2 Windshield Wiper Selector Panel . . . . . . . . . . . . . . . . . . . . . . . . . 3.10.2 Probe Heat Panel  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.10.3 Engine Anti–Ice Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.10.4
Thermal Anti–Ice Indication . . . . . . . . . . . . . . . . . . . . . . . . . . 3.10.5 Wing Anti–Ice Panel  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.10.5
System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.20.1
Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.20.1 Anti-Ice Components Diagram . . . . . . . . . . . . . . . . . . . . . . . . 3.20.1 Flight Deck Window Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.20.2 Flight Deck Window Heat Operation . . . . . . . . . . . . . . . . . . . 3.20.2 Flight Deck Window Heat Schematic . . . . . . . . . . . . . . . . . . . 3.20.4 Windshield Wipers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.20.6 Probe and Sensor Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.20.6 Engine Anti–Ice System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.20.7 Engine Anti–Ice System Operation  . . . . . . . . . . . . . . . . . . . . 3.20.7 Engine Anti–Ice System Schematic  . . . . . . . . . . . . . . . . . . . . 3.20.8 Wing Anti–Ice System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.20.9 Wing Anti–Ice System Operation . . . . . . . . . . . . . . . . . . . . . . 3.20.9 Wing Anti–Ice System Schematic  . . . . . . . . . . . . . . . . . . . . 3.20.10
Copyright . The Boeing Company. See title page for details.
Anti-Ice, Rain -Table of Contents 737 Flight Crew Operations Manual

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Copyright . The Boeing Company. See title page for details.
3.TOC.0.2  June 1, 2005

737 Flight Crew Operations Manual

Window Heat Panel
OVERHEAT  OVERHEAT 
ON  ON 

OVERHEAT  OVERHEAT 
ON  ON 

Window OVERHEAT Lights
Illuminated (amber) – overheat condition is detected.
Note:  OVERHEAT lights also illuminate if electrical power to window(s) is interrupted.

Window Heat ON Lights
Illuminated (green) – window heat is being applied to selected window(s).
Extinguished –

.
switch is OFF, or

.
an overheat is detected, or

.
a system failure has occurred.

WINDOW HEAT Switches
ON – window heat is applied to selected window(s).
OFF – window heat not in use.

WINDOW HEAT Test Switch (spring–loaded to neutral)
OVHT – simulates an overheat condition.
Copyright . The Boeing Company. See title page for details.
Anti-Ice, Rain -Controls and Indicators 737 Flight Crew Operations Manual

PWR TEST – provides a confidence test.
Note:  Refer to Supplementary Normal Procedures for Window Heat Test procedures.
Windshield/Foot Air Controls

FOOT AIR Controls
PULL – supplies conditioned air to pilots’ leg positions.

WINDSHIELD AIR Controls
PULL – supplies conditioned air to number 1 windows for defogging.
Windshield Wiper Selector Panel

Windshield WIPER Selectors
PARK – turns off wiper motors and stows wiper blades.
INT – seven second intermittent operation.
LOW – low speed operation.
HIGH – high speed operation.
　
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