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Directorate of OperationalSlide 1 of 30

737-300/400

ANTI-ICE

NextMain Menu Quit
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Anti-Ice Protection Areas

The cowl lip on both

engines are heated

utilizing bleed air.

Both elevator pitot

tubes (one on each

side of vertical

stabilizer) are

electrically heated.

All six leading

edge slats (three

on each wing) are

heated utilizing

bleed air.

All four pitot-statictubes (two on

each side), both

AOA vanes (one

on each side) and

the TAT probe (left

side only) are


Eight of the ten flight deck

windows are electrically heated.
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Window Heat Panel

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Window Heat Panel

Window OVERHEAT Lights:

Illuminated

Overheat condition is detected.

Temp reaches 62 degree celcius

Note: OVERHEAT light illuminates

if electrical power to window is

interrupted.

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Window Heat Panel

Window Heat ON Lights:

Illuminated

Window heat is being applied to

selected window. Under normal

conditions, all four green ON lightsshould illuminate when the WINDOW

HEAT switches are positioned to ON.Range working temperature 32-43 degree

celcius

Extinguished

One of the following has occurred:

The respective switch has been

turned OFF.

An overheat condition has been

detected.

A system failure has occurred.

The respective window is already

above it normal operating temperature.

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Window Heat Panel

WINDOW HEAT Switches:

ON

Window heat is applied to selected

window.

OFF

Window heat not in use.

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Window Heat Panel

WINDOW HEAT Test Switch:

(spring-loaded to center)

OVHT

Tests the window overheat system by

simulating an OVERHEAT condition.

PWR TEST

Provides a confidence test. Use PWR

TEST whenever one or more green ON

lights do not illuminate when the

WINDOW HEAT switches are positioned

to ON.

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Window/Foot Air Controls

WINDSHIELD AIR Controls:

Pull

Supplies conditioned air to respective

forward windows (L1 and R1) for

defogging.

FOOT AIR Controls:

Pull

Supplies conditioned air to pilots leg

positions.

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Pitot-Static Heat Panel

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PITOT STATIC Lights:

Illuminated

Related probe not heated.

ExtinguishedRelated probe is receiving heat.

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PITOT STATIC HEAT Switches (A and B):

ON

Power is supplied to electrically heat

related probe. Respective pitot-static

light will extinguish to indicate heat isbeing applied.

OFF

Power is removed from related probe.

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Engine Anti-Ice Panel

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COWL ANTI-ICE Lights:

Illuminated

Indicates an overpressure or

overtemperature condition in the duct

downstream of the engine cowl anti-

ice valve.Over pressure >65 PSI

Over temperature >825 degree F

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COWL VALVE OPEN Lights:

Illuminated bright blue

Related engine cowl anti-ice valve is in

transit, or related engine cowl anti-ice

valve position disagrees with related

ENG ANTI-ICE switch position.

Illuminated dim blue

Related engine cowl anti-ice valve is

fully open and therefore in agreement

with ENG ANTI-ICE switch position

(switch ON). Normal pressure 50 PSI

Extinguished

Related cowl anti-ice valve is closed

(switch OFF).

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ENGINE ANTI-ICE Switches:

ON

Related engine cowl anti-ice valve is

signaled to open.

OFFRelated engine cowl anti-ice valve is

signaled to close.

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Wing Anti-Ice Panel

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Wing Anti-Ice Panel

Wing Anti-Ice (L & R) VALVE OPEN Lights:

Illuminated bright blue

Related wing anti-ice valve is in transit, or

related wing anti-ice valve position

disagrees with WING ANTI-ICE switch

position.

Illuminated dim blue

Related wing anti-ice valve is fully open and

therefore in agreement with WING ANTI-ICE

switch position (switch ON). Max

temperature 257 degree F / 125 degree C

Extinguished

Related wing anti-ice valve is closed

(switch OFF).

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Wing Anti-Ice PanelWING ANTI-ICE Switch:

OFF

Both wing anti-ice valves are signaled

to close.

ON (in flight)

Both wing anti-ice valves are signaled

to open.

ON (on the ground)

Both wing anti-ice valves are signaled to

open if both thrust levers are below the

takeoff warning setting and temperature

inside both distribution ducts is below

thermal switch activation temperature. Both wing anti-ice valves are signaled to

close if either thrust lever is above the

takeoff warning setting or the thermal

switch is activated in either distribution

duct. Switch remains in ON position.

Switch automatically moves to OFF upon

air/ground system sensing air mode.

This concludes the review of the

Anti-Ice Panels. The remainder of the

presentation will discuss the anti-ice system

in greater detail. Click Next to continue.
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Window Heat

L4L5

R4R5

L1L2L3

R1R2

R3

Temperature controllers maintain the forward (L1, R1) and side windows (L2, R2) at the correcttemperature to ensure maximum strength of the windows in the event of a bird strike. Power to the

forward and side windows is automatically removed if an overheat condition is detected. A thermal switch

attached to the aft overhead windows (L5, R5). This thermal switch opens and closes to maintain the

correct temperature of the overhead windows (see schematic next slide). Windows L3 and R3 are not


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Window Overheat TestUse the OVHT test to simulate an overheat condition of the window heat system. This test will ensure that

window overheat protection is operating normally.

Click here to see a demonstration

of the OVHT test
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Window Heat Power TestUse PWR TEST whenever one or more green ON lights do not illuminate when the WINDOW HEAT

switches are positioned to ON. This will provide a confidence test to ensure that the window heat system

is operating normally.

Click here to see a demonstration

of the PWR TEST
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Window Heat Schematic

L1 R1 R2R3

L2L3

L5L4 R4 R5

VENTED TO

FLIGHT DECK

VENTED TO

FLIGHT DECK

THERMAL

SWITCH

WIND-

SHIELD

AIR

WIND-

SHIELD

AIRFROM

AIR CONDITIONING

SYSTEM

TEMPERATURE

CONTROLLERTEMPERATURE

CONTROLLER

TEMP

CONTTEMP

CONT

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Pitot-Static Probe and Sensor Heat

See picture of pitot-static

probes associated

with lights above

See picture of pitot-static

probes associated

with lights above

All pitot-static probes, the total temperature probe (TAT PROBE), and the angle of airflow sensors(L, R ALPHA VANE) are electrically heated to prevent the formation of ice. The two alternate static

ports are not heated.

See picture of alternate

static port
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Engine Anti-IceThe engine anti-ice system utilizes bleed air from the 5th or 9th stage of the high pressure compressor

section. Only the engine cowl lip is anti-iced. The cowl anti-ice valve is electrically activated and

pneumatically operated. Positioning the respective ENG ANTI-ICE switch to ON allows engine bleed air to

flow through the cowl anti-ice valve to the cowl lip. While the cowl anti-ice valve is transitioning fromclosed to open, the COWL VALVE OPEN light illuminates bright blue. When the cowl anti-ice valve is fully

open, the COWL VALVE OPEN light illuminates dim blue.

Engine

bleed air

valve

To pneumatic

system

Cowlanti-ice

valve

9th

stage

5th

stage

High

stage valve

(9th)

No. 1 engine

See picture of

engine cowl lip
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Engine Anti-IceIf the cowl anti-ice valve fails to move to the position selected by the ENG ANTI-ICE switch, the COWL

VALVE OPEN light remains illuminated bright blue. The amber COWL ANTI-CE illuminates to indicate

excessive pressure or temperature in the duct leading from the cowl anti-ice valve to the cowl lip. Engine

anti-ice is available to the cowl lip even when the engine bleed air valve is closed. For example, during aBLEED TRIP, the engine bleed air valve is automatically signaled to close. This closure will not affect

engine anti-ice availability for the respective engine.

Engine

bleed air

valve

To pneumatic

system

Cowlanti-ice

valve

9th

stage

5th

stage

High

stage valve

(9th)

No. 1 engine

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Wing Anti-IceThe wing anti-ice system utilizes bleed air to protect the leading edge slats only. The wing anti-ice system

does not include the leading edge flaps (Krueger flaps). The wing anti-ice valves are AC motor operated.With a valve open, bleed air flows to the leading edge slats via a telescoping duct. The bleed air is then

exhausted overboard through small exhaust holes located on the lower surface of the slats. The wing

anti-ice system is effective with the slats in any position (fully retracted, extended, or fully extended).

Leading Edge

Flaps

(not heated)

Leading Edge

Flaps

(not heated)

Leading Edge

Slats

Leading Edge

Slats

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Wing Anti-IceSystem operation on the ground: Positioning the WING ANTI-ICE switch to ON, signals the two (left &

right) wing anti-ice valves to open. The valves will open if the thrust levers on both engines are below thesetting for takeoff warning activation (approximately 32 thrust lever angle) and the temperature inside

both wing distribution ducts is less than the thermal switch activation temperature. While the valves are

transitioning from closed to open, the associated VALVE OPEN light will illuminate bright blue, and then

illuminate dim blue when the respective valve is fully open.

Leading Edge

Flaps

(not heated)

Leading Edge

Flaps

(not heated)

Leading Edge

Slats

Leading Edge

Slats

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Wing Anti-IceSystem operation on the ground (continued): Both wing anti-ice valves are signaled to close if either

thrust lever is above the setting for takeoff warning activation or the temperature inside either wingdistribution duct senses over-temperature. In the event that the valves do close, the associated VALVE

OPEN light illuminates bright blue to indicate disagreement between switch and valve position (WING

ANTI-ICE switch remains in the ON position). The valves automatically re-open when both thrust levers

are repositioned below the setting for takeoff warning activation and both temperature sensors are cool.

VALVE OPEN lights now illuminate dim blue to indicate agreement between switch and valve position.

Leading Edge

Flaps

(not heated)

Leading Edge

Flaps

(not heated)

Leading Edge

Slats

Leading Edge

Slats

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Wing Anti-IceSystem operation in flight: During takeoff, when the air/ground sensing system detects being airborne,

the WING ANTI-ICE switch automatically trips to the OFF position, which will result in the VALVE OPENlights changing from bright blue to extinguished. The extinguishing of the VALVE OPEN lights indicate

that the wing anti-ice valves are now fully closed, which is in agreement with the WING ANTI-ICE switch

(OFF). Once in flight, thrust lever setting logic and distribution duct temperature are inhibited and have

no affect on wing anti-ice valve operation, therefore both valves open when the WING ANTI-ICE switch is

positioned to ON.

Leading Edge

Flaps

(not heated)

Leading Edge

Flaps

(not heated)

Leading Edge

Slats

Leading Edge

Slats

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Wing Anti-Ice Schematic

TELESCOPING DUCT

LEADING EDGE SLATS

PNEUMATIC

MANIFOLDWING ANTI-ICE

VALVE

WING DISTRIBUTION DUCT

RIGHT

MAIN

LANDING

GEAR

GROUND

AIR

HIGH

TEMP

LOW

TEMP

THRUST LEVERS ABOVE T/O WARNING THRUST LEVERS BELOW T/O WARNING

THERMAL

SWITCH
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Documents

Anti-Ice R 01