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.
D6-27370-866-EGP 3.20.7
Both valves close if either engine thrust is above the takeoff warning setting or
either temperature sensor senses a duct overtemperature. The valves automatically
reopen if thrust on both engines is reduced and both temperature sensors are cool.
With the air/ground sensor in the ground mode and the WING ANTI–ICE switch
ON, the switch remains in the ON position regardless of control valve position.
The WING ANTI–ICE switch automatically trips OFF at lift–off when the
air/ground sensor goes to the air mode.
Positioning the WING ANTI–ICE switch to ON in flight:
• opens both control valves
• sets stall warning logic for icing conditions.
Note: Stall warning logic adjusts stick shaker and minimum maneuver
speed bars on airspeed indications. FMC displayed VREF is not
adjusted automatically.
Note: Stall warning logic remains set for icing conditions for the remainder
of the flight, regardless of subsequent WING ANTI–ICE switch
position.
Duct temperature and thrust setting logic are disabled and have no affect on
control valve operation in flight.
Valve position is monitored by the blue VALVE OPEN lights.
September 15, 2016
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