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In the air, by referring to the placard below the pressurization control panel, the cabin altitude indicator is set to the isobaric cabin altitude, based on the proposed flight altitude and pressure differential. Cabin rate of climb or descent is controlled by the cabin rate selector. In descent, the cabin altitude indicator is set 200 feet below landing field altitude to insure a pressurized cabin during landing.
Manual Mode Operation (CPCS)
A green MANUAL Light illuminates with the pressurization mode selector in MAN AC or MAN DC.
Operation in the MAN modes assumes failure of the AUTO and STANDBY modes. Manual mode allows the pilot, by using the outflow valve switch, to modulate the main outflow valve while monitoring the outflow valve position indicator. MAN AC mode uses the AC motor to control the main outflow valve; MAN DC uses the DC motor. The rate of operation in MAN AC is faster than that in MAN DC.
Manual Mode Operation (DCPCS)
A green MANUAL Light illuminates with the pressurization mode selector in
MAN. Manual control of the cabin altitude is available if the AUTO and ALTN modes are inoperative. Operation in the MAN modes assumes a dual channel automatic mode failure. In the MAN mode the outflow valve switch is used to modulate the main outflow valve by monitoring the cabin altitude panel and valve position on the outflow valve position indicator. The main outflow valve is driven by a DC motor at a slower rate than the automatic modes. Outflow valve full range of motion can take up to 20 seconds.
Air Systems -Pressurization System Description 737 Operations Manual

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2.40.12  June 7, 2002

Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3.10.1
Window Heat Panel  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3.10.1 Windshield/Foot Air Controls . . . . . . . . . . . . . . . . . . . . . . . . . . .  3.10.2 Windshield Wiper Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3.10.3 Pitot Static Heat Panel  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3.10.4 Engine Anti–Ice Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3.10.5 Wing Anti–Ice Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3.10.6
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 . . . . . . . . . . . . . . . . . . .  3.20.3 Windshield Wipers and Rain Repellent . . . . . . . . . . . . . . . . . . . .  3.20.4 Probe and Sensor Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3.20.4 Engine Anti–Ice System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3.20.4 EngineAnti–Ice System Operation . . . . . . . . . . . . . . . . . . . .  3.20.4 Engine Anti–Ice System Schematic . . . . . . . . . . . . . . . . . . . .  3.20.5 Wing Anti–Ice System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3.20.5 Wing Anti–Ice System Operation . . . . . . . . . . . . . . . . . . . . . .  3.20.5 Wing Anti–Ice System Schematic  . . . . . . . . . . . . . . . . . . . . .  3.20.7
Anti-Ice, Rain -Table of Contents 737 Operations Manual

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3.TOC.0.2  December 7, 2001

737 Operations Manual

Window Heat Panel
OVERHEAT  OVERHEAT 
ON  ON 

OVERHEAT  OVERHEAT 
ON  ON 

OVERHEAT  OVERHEAT 
OFF  OFF 

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

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

.
switch is OFF, or

.
an overheat is detected, or

.
a system failure has occurred, or

.
system is at correct temperature.

 

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

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