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· Adjusts stick shaker and minimum maneuver speed bars on airspeed
indications. FMC displayed VREF is not adjusted automatically.
· Stick shaker logic and airspeed indications return to normal when engine
anti-ice is positioned OFF if wing anti-ice has not been used in flight.
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 and an
amber TAI indication illuminates on the CDS after a short delay.
The amber COWL ANTI-ICE light illuminates due to excessive pressure in the duct
leading from the cowl anti-ice valve to the cowl lip.
ANTI-ICE & RAIN
737 Sec. 6.3 Page 11
Flight Manual Continental Rev. 11/15/02 #41
Engine Anti-Ice Panel
< COWL ANTI-ICE Light
>>@
Illuminated (amber) – An overpressure or overtemperature condition in the
duct downstream of the engine cowl anti-ice valve.
BCD
Illuminated (amber) – Indicates an overpressure condition in duct
downstream of engine cowl anti-ice valve.
= COWL VALVE OPEN Lights
Illuminated (blue) –
· Bright – Related cowl anti-ice valve is in transit, or, cowl anti-ice
valve position disagrees with related ENGINE ANTI-ICE switch position.
· Dim – Related cowl anti-ice valve is open (switch ON).
· Extinguished – Related cowl anti-ice valve is closed (switch OFF).
ANTI-ICE & RAIN
Sec. 6.3 Page 12 737
Rev. 11/15/02 #41 Continental Flight Manual
> ENG ANTI-ICE Switches
ON –
· Related engine anti-ice valve is open
BCD
· Stick shaker logic is set for icing conditions.
OFF –
· Related engine anti-ice valve is closed.
BCD
· Stick shaker logic returns to normal if wing anti-ice has not beed used
in flight.
BCD Thermal Anti-Ice Indication
< Thermal Anti-Ice Indications
Illuminated –
· Green – cowl anti-ice valve(s) open
· Amber – cowl anti-ice valve is not in position indicated by related
engine anti-ice switch.
ANTI-ICE & RAIN
737 Sec. 6.3 Page 13
Flight Manual Continental Rev. 11/15/02 #41
WING ANTI-ICE SYSTEM
>>@
The wing anti-ice system provides protection for the three leading edge slats by
using bleed air. The wing anti-ice system does not include the leading edge
flaps.
BCD
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 and will remain in
position with loss of electrical power. With a valve open, bleed air flows to the
three leading edge inboard slats, and then exhausts overboard. The wing antiice
system is effective with the slats in any position.
ANTI-ICE & RAIN
Sec. 6.3 Page 14 737
Rev. 11/15/02 #41 Continental Flight Manual
Wing Anti-Ice Schematic
ANTI-ICE & RAIN
737 Sec. 6.3 Page 15
Flight Manual Continental Rev. 11/15/02 #41
Wing Anti-Ice System Operation
Placing the WING ANTI-ICE switch ON when on the ground, 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.
Both valves close if either engine thrust is above the takeoff warning setting or
either temperature sensor senses a duct overtemperature. The valves
automatically open 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.
BCD
Positioning the WING ANTI-ICE switch to ON in flight:
· Opens both control valves.
· Sets stick shaker logic for icing conditions.
· Adjusts stick shaker and minimum maneuver speed bars on airspeed
indications. FMC displayed VREF is not adjusted automatically.
· Stick shaker logic remains set for icing conditions for the remainder of the
flight, regardless of subsequent WING ANTI-ICE switch position.
Valve position is monitored by the blue VALVE OPEN lights. Duct temperature
and thrust setting logic are disabled and have no affect on control valve
operation in flight.
ANTI-ICE & RAIN
Sec. 6.3 Page 16 737
　
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