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The ice detectors emit icing signals to the following:
· ANTIICE
panel (cowl antiice
relay), for activation of the cowl antiicing
system (AUTO).
· BMC for activation of the wing antiicing
system (AUTO). The AUTO operation of WING
ANTIICE
is inhibited during takeoff
until the airplane is >400 feet above field elevation.
· Stall protection system, to change stick shaker control, if an ice detector has failed and to the
BMC for fault indication. For more information on Stall Protection, refer to Chapter 10 FLIGHT
CONTROLS.
Once deiced,
the probe cools within a few seconds and is ready to sense ice buildup again. This
cycling process is repeated as long as the ice detector remains in an icing environment.
The ice detectors are not capable of operating at low airspeeds of less than 29 knots IAS, therefore
they cannot be used to detect icing when the airplane is on the ground.
ICE AND RAIN PROTECTION
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
14−10−4
ICE DETECTION INDICATION
If ice is detected and the ANTI-ICE system is turned OFF, a message is displayed on EICAS.
GF1410_008
ICE
AUTO AUTO
OFF ON
AUTO
L COWL WING R COWL
ANTI−ICE
OFF ON OFF ON
If ice is detected and the ANTI-ICE system is turned to ON or AUTO, the following message is
displayed on EICAS.
GF1410_009
OR ICE
AUTO AUTO
OFF ON
AUTO
L COWL WING R COWL
ANTI−ICE
AUTO AUTO
OFF ON
AUTO
L COWL WING R COWL
ANTI−ICE
OFF ON
OFF ON
OFF ON
OFF ON
If both ice detectors are failed, a message is displayed on EICAS and the crew must revert to manual
selection of cowl and wing anti-ice.
GF1410_010
ICE DETECTOR FAIL
AUTO AUTO
OFF ON
AUTO
L COWL WING R COWL
ANTI−ICE
OFF ON OFF ON
If a single ice detector fails, a message is displayed on EICAS. If ice is detected by the other ice
detector, the Stall Protection system enables a change in stick shaker control and a message is
displayed on EICAS.
GF1410_011
ICE
ICE DETECTOR FAULT
STALL WARN ADVANCE
ICE AND RAIN PROTECTION
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
14−10−5
PNEUMATIC ANTI-ICING
Engine bleed air is used for the following systems:
COWL ANTI-ICING (CAI)
The cowl anti-icing 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 Anti-Ice Valves
There are two Cowl Anti-Ice Valves (CAIV), which control the flow of engine bleed air to the cowl
ducting. The CAIVs are spring-loaded 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 51, Aug 14, 2006
CSP 700−6
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 ANTI-ICE panel, that commands the anti-ice valves open. If
an ice detector fails, the other detector will activate both cowl anti-ice 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 anti-icing 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 anti-ice is activated
(AUTO or ON), a CAI icon will be displayed on the EICAS page.
　
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