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73.3 73.3
789 789
N1
ITT
CAI CAI
INDICATION
CAI
LP
HP
GF1410_014
L−R COWL A/ICE ON
EICAS
AUTO
OFF ON
L COWL
ICE AND RAIN PROTECTION
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
14−10−7
WING ANTI-ICING (WAI)
The wing anti-icing system is used to prevent formation of ice on the leading edge of the wing. The
wing leading edge uses hot engine bleed air from either the 5th stage or the high pressure
compressor 8th stage, of the bleed air system.
HP
GROUND
AIR
SUPPLY
R WING
A/I VALVE
CROSS
BLEED
VALVE
L WING
A/I VALVE
WING
CROSSBLEED
VALVE
TEMPERATURE
SENSORS
ICE
DETECTOR
LOW
PRESS
PORT
HIGH
PRESS PORT
L ATS
VALVE
HIGH
PRESS
VALVE
PRSOV
COWL ANTI−ICE
L COWL
A/I VALVE
R ATS
VALVE
R COWL
A/I VALVE
R AIR
TURBINE
STARTER
APU
L AIR
TURBINE
STARTER
BMC 1 BMC 2
CONT
CH
MON
CH
CONT
CH
MON
CH
DAU DAU
L AIR
CONDITIONING
GF1410_015a
R AIR
CONDITIONING
Wing Anti-Ice Valves (WAIV)
Two wing anti-ice valves are electrically controlled, pneumatically operated, spring loaded closed,
modulating shutoff valves. The ice detector system will send a signal to the BMC to activate the
wing anti-ice system. One temperature sensor, located in the fixed leading edge, provides a signal
to the control channel of the BMC, which drives the WAIVs open or closed. A second temperature
sensors, located in the fixed leading edge, provide a signal to a monitoring channel in the BMC.
One channel controls and the other channel act as a monitor but can assume control in the event
of a failure of the control sensor. In the event of complete failure of sensors on one side, the
serviceable control sensor on the opposite side, will control the WAIVs.
ICE AND RAIN PROTECTION
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
14−10−8
WAI OPERATION
The ice detectors will send a signal to the BMC to activate the wing anti-ice system when selected to
AUTO. Wing anti-ice can be manually selected to ON, in which case the WAIVs will open,
independent of the ice detection system. Whenever wing anti-ice is activated (AUTO or ON), a WAI
icon will be displayed on the EICAS page. The ICON colour will vary from amber, green or white,
depending on the temperature in the wing and/or its status.
GF1410_016
LP
HP
L R
APU
HP
LP
COND
AIR
BLEED/ANTI-ICE
WING A/ICE AUTO
789 789
N1
ITT
WAI WAI
40
PSI
WING A/ICE ON
AUTO
OFF ON
WING
WING
AUTO
OFF ON
40
PSI
Crossbleed Valve (CBW)
The left and right hand anti-ice systems normally operate independently from one another. In the
event of a single engine failure, bleed failure or a failure of wing anti-ice air supply on one side, the
left and right systems are interconnected by a CBW. This allows both wings to be fed from a single
engine. In case of a failure in AUTO operation, the CBW will automatically open and the affected
WAIV will automatically be closed by the BMC. Manual operation of the CBW is provided on the
ANTI-ICE panel.
73.3 73.3
789 789
N1
ITT
WAI WAI
GF1410_017
LP
HP
L R
APU
HP
LP
COND
AIR
BLEED/ANTI-ICE
0
PSI
WING XBLEED FROM R
40
PSI
WING A/ICE AUTO
OR
AUTO
FROM L FROM R
WING XBLEED
AUTO
FROM L FROM R
WING XBLEED
ICE AND RAIN PROTECTION
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
14−10−9
WAI FAILURE INDICATIONS
The WAI failure indications are as follows:
Wing Anti-Ice Overheat
If there is an overheat in the wing anti-ice system, a message is displayed on EICAS.
Turn WING ANTI-ICE OFF
789 789
N1
ITT
WAI WAI
GF1410_018a
BLEED/ANTI-ICE
WING A/ICE OVHT
AUTO
OFF ON
WING
AUTO
OFF ON
WING
Wing Anti-Ice Fail
If wing anti-ice is failed, a message is displayed on EICAS. If ice is detected during this failure
condition, the stall warning trigger points are advanced automatically. Ensure rpm (N2) is above
76% may remove this amber message.
　
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