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displayed on EICAS.
GF1410_011
ICE
ICE DETECTOR FAULT
STALL WARN ADVANCE
ICE AND RAIN PROTECTION
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
14−10−5
PNEUMATIC ANTI-ICING
Engine bleed air is used for the following systems:
COWL ANTI-ICING (CAI)
The cowl antiicing
system is used to prevent formation of ice on the nose cowl of the engine. The
cowl leading edge uses hot engine bleed air from the low pressure compressor 5th stage to heat the
nose cowl. The bleed air is ducted through a spray ring and exhausts to atmosphere, through an exit
grill.
Engine Spinner
The engine spinner point is made of soft rubber which will distort during engine running and ice
accumulation and will shed any ice buildup. The rear of the spinner and the fan blades use
centrifugal force to shed ice after start up, to prevent ice accumulation during engine running.
X
SPRAY RING
EXHAUST DUCT
EXHAUST
NOSE COWL LIP
SPINNER
FAN BLADES
AIR INLET COWL
SPINNER POINT
BLEED AIR
SUPPLY DUCT
NOSE COWL LIP
GF1410_012
AND SPINNER
Cowl AntiIce
Valves
There are two Cowl AntiIce
Valves (CAIV), which control the flow of engine bleed air to the cowl
ducting. The CAIVs are springloaded
open, pneumatically operated, electrically controlled,
pressure regulating and shutoff valves, that are controlled by signals from the ice detecting
system. They are either fully open or fully closed.
ICE AND RAIN PROTECTION
Flight Crew Operating Manual Rev 3, Apr 25, 2005
CSP 700−5000−6
Volume 2
14−10−6
CAI OPERATION
When the L and/ or R COWL selector is selected to AUTO and ice is detected, the ice detection
system sends a signal to a relay in the ANTIICE
panel, that commands the antiice
valves open. If
an ice detector fails, the other detector will activate both cowl antiice
valves in AUTO mode. A status
message is displayed on EICAS.
RH ICE DETECTOR
LH ICE DETECTOR
LOW PRESS
PORT
HIGH PRESS
PORT
CAIV
SPRAY RING
SYNOPTIC
LP
HP
GF1410_013
HP
LP
L−R COWL A/ICE AUTO
AUTO
OFF ON
R COWL
AUTO
OFF ON
L COWL
Cowl antiicing
can be manually selected to ON, in which case the CAIVs will open, independent of
the ice detection system and a status message is displayed. Whenever cowl antiice
is activated
(AUTO or ON), a CAI icon will be displayed on the EICAS page.
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 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
14−10−7
WING ANTI-ICING (WAI)
The wing antiicing
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_015
Wing AntiIce
Valves (WAIV)
Two wing antiice
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 antiice
system. The 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. The other temperature
sensors, located in the fixed leading edge, provide a signal to a monitoring channel in the BMC.
One channel controls and the other channels 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
　
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