737 Flight Crew Operations Manual
Anti-Ice, Rain -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
3.20.6 D6-27370-866-EGP
Engine Anti–Ice System Schematic
Wing Anti–Ice System
The wing anti–ice system provides protection for the three inboard leading edge
slats by using bleed air. The wing anti–ice system does not include the leading
edge flaps or the outboard leading edge slats.
The wing anti–ice control valves are AC motor–operated. With a valve open,
bleed air flows to the three leading edge inboard slats, and is then exhausted
overboard. The wing anti–ice system is effective with the slats in any position.
Wing Anti–Ice System Operation
On the ground, positioning the WING ANTI–ICE switch ON opens both control
valves if thrust on both engines is below the setting for takeoff warning activation
and the temperature inside both wing distribution ducts is less than the thermal
switch activation temperature.
COWL
ENGINE COWL
DUCT
9th
5th
ENGINE
BLEED
VALVE
MODULATING &
SHUTOFF VALVE
TO
BLEED AIR
BLEED AIR
ANTI-ICE (TAI)
ANTI-ICE
VALVE
1
ON
OFF
COWL
COWL VALVE
ENG
ANTI-ICE
2
OPEN
COWL
ANTI-ICE
ANTI-ICE
COWL VALVE
OPEN
September 15, 2016
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