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ANTI-ICE & RAIN
Sec. 6.3 Page 4 737
Rev. 11/15/02 #41 Continental Flight Manual
Flight Deck Window Heat Operation
The FWD WINDOW HEAT switches control heat to window No. 1. The SIDE
WINDOW HEAT switches control heat to window Nos. 2, 4 and 5.
Temperature controllers maintain window Nos. 1 and 2 at the correct
temperature to ensure maximum strength of the windows in the event of bird
impact. Power to window Nos. 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 Nos. 4 and 5.
Window Heat Panel
< Window OVERHEAT Lights
Illuminated (amber) – Overheat condition is detected, power removed from
window. ON light extinguishes.
OVERHEAT lights 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,
· overheat is detected,
· system failure.
ANTI-ICE & RAIN
737 Sec. 6.3 Page 5
Flight Manual Continental Rev. 11/15/02 #41
> WINDOW HEAT Switches
ON –
· Signals the window heat controller to apply heat to the associated
window.
· The SIDE switch supplies power to windows Nos. 2, 4, 5.
OFF –
· Window heat not in use.
· Resets the OVERHEAT light circuit.
? WINDOW HEAT Test Switch (spring-loaded to neutral)
OVHT – Simulates an overheat condition. All OVERHEAT lights illuminate.
· ON lights may extinguish immediately, or remain illuminated for as
long as 70 seconds.
· Reset by momentarily positioning the window heat switch to OFF.
PWR TEST – Provides a confidence test (window heat switches must be ON).
· Controller is forced to full power, bypassing normal temperature
control.
· Overheat protection is still available.
ANTI-ICE & RAIN
Sec. 6.3 Page 6 737
Rev. 11/15/02 #41 Continental Flight Manual
WINDSHIELD WIPERS
>>@ The rain removal system for the forward windows consists of
windshield wipers. The forward window wipers are controlled by one switch.
BCD A permanent rain repellent has been applied to the window at the
factory. Each window wiper has its own switch.
Windshield scratching will occur if the windshield wipers are operated on a dry
windshield.
>>@ Rain Removal Controls
< RAIN REPELLENT Switch (INOP)
System deactivated.
= Windshield WIPER Selector
PARK – Momentary position used to stow both wiper blades.
OFF – Spring loaded to OFF from PARK position.
LOW – Low speed operation both blades.
HIGH – High speed operation both blades.
ANTI-ICE & RAIN
737 Sec. 6.3 Page 7
Flight Manual Continental Rev. 11/15/02 #41
BCD 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.
ANTI-ICE & RAIN
Sec. 6.3 Page 8 737
Rev. 11/15/02 #41 Continental Flight Manual
ENGINE ANTI-ICE SYSTEM
Engine bleed air thermal anti-icing prevents the formation of ice on the engine
cowl lip. Engine anti-ice operation is controlled by individual ENG ANTI-ICE
switches. The engine anti-ice system is operated on the ground and in fight.
>>@ Engine Anti-Ice System Schematic
ANTI-ICE & RAIN
737 Sec. 6.3 Page 9
Flight Manual Continental Rev. 11/15/02 #41
BCD Engine Anti-Ice System Schematic
ANTI-ICE & RAIN
Sec. 6.3 Page 10 737
Rev. 11/15/02 #41 Continental Flight Manual
>>@ Engine Anti-Ice System Operation
Each cowl anti-ice valve is electrically controlled and pressure actuated.
Positioning the ENG ANTI-ICE switches to ON allows engine bleed air to flow
through the cowl anti-ice valve for cowl lip anti-icing.
If the cowl anti-ice valve fails to move to the position indicated by the ENG ANTIICE
switch, the COWL VALVE OPEN light remains illuminated bright blue. The
amber COWL ANTI-ICE light illuminates due to excessive pressure or temperature
in the duct leading from the cowl anti-ice valve to the cowl lip.
BCD Engine Anti-Ice System Operation
Each cowl anti-ice valve is electrically controlled and pressure actuated.
Positioning the ENG ANTI-ICE switches to ON:
· Allows engine bleed air to flow through the cowl anti-ice valve for cowl lip
anti-icing.
· Sets stick shaker logic for icing conditions.
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