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mode fail. The valves are set to regulate at 35 ± 5 psig. During modulation, the regulated
pressure will be lower than this value.
Wing Anti-Ice Controller
The wing anti-ice controller maintains the temperature of the left and right wing leading edges
when NORM mode is selected. The wing anti-ice controller is bypassed when STBY mode is
selected.
NORM Mode
When the WING ANTI-ICE switch is selected to the NORM position, the wing leading edge
temperatures are continuously monitored by their respective control sensor. The wing anti-ice
controller modulates both wing anti-ice valves simultaneously to maintain a constant wing
leading edge temperature (88°C/190°F).
The green L HEAT/R HEAT lights, located on the ANTI-ICE panel, will illuminate when the
respective wing leading edge is sufficiently heated to prevent ice accumulation (above
29°C/85°F).
ICE AND RAIN PROTECTION
Description
Vol. 2 14−10−3
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
WING ANTI-ICE SYSTEM (CONT'D)
STBY Mode
When the WING ANTI-ICE switch is selected to the STBY position, the wing anti-ice controller
is bypassed, and both wing anti-ice valves are independently controlled by their respective
standby thermal switch. The valves will cycle either fully open or fully closed, to maintain the
wing leading edge temperature within a predetermined temperature range (49°C/120°F and
82°C /180°F).
Wing Overheat
Should a wing leading edge reach a temperature of 129°C/265°F or greater, the WING OVHT
warning EICAS message will appear, accompanied by the “WING OVERHEAT” voice warning
and the flashing MASTER WARNING lights. Once the temperature drops below this value, the
WING OVHT warning message will be removed.
14th-Stage Isolation Valve
The isolation valve allows both wings to be anti-iced from a single source, by using the
crossover duct. The 14th-stage isolation valve is normally closed during wing anti-icing. Should
a wing anti-ice valve fail, or if an engine is not capable of supplying 14th-stage bleed air, the
isolation valve can be selected open by the flight crew, allowing the operative system to anti-ice
both wings.
The 14th-stage isolation valve is pneumatically operated and electrically controlled by the
14th-stage ISOL switch/light on the BLEED AIR panel. Valve status is indicated by a switch/light
OPEN annunciation (see Figure 14−10−1).
The isolation valve is spring-loaded to the closed position when no 14th-stage bleed air is
available, or electrical power control is lost.
Thrust Reverser Override Function
The 14th-stage bleed air cannot simultaneously supply the demands of the thrust reverser and
the wing anti-ice system. Therefore, the wing anti-ice system is automatically disabled upon
thrust reverser operation. The EICAS caution messages for wing anti-ice are inhibited during
thrust reverser operation.
ENGINE COWL ANTI-ICE SYSTEM
Description
The engine cowl anti-ice system prevents ice formation on the cowl leading edges and the T2
probe at the engine inlet, using pressure-regulated 14th-stage bleed air.
The bleed air is ducted to the T2 probe and to the cowl leading edges from the cowl anti-ice valve
and the ejector. The ejector circulates the air within the cowl with air ejected from the piccolo tubes
onto the inner surfaces of the leading edge. After heating the cowl leading edges, the air is
exhausted overboard through a louvered exit at the bottom of the engine nacelle.
The L (R) COWL ANTI-ICE switch/lights, located on the ANTI-ICE panel, control the left and right
engine cowl anti-ice valves respectively.
ICE AND RAIN PROTECTION
Description
Vol. 2 14−10−4
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
ENGINE COWL ANTI-ICE SYSTEM (CONT'D)
Cowl Anti-Ice System
Figure 14−10−3
Components and Operation
Cowl Anti-Ice Valves
The cowl anti-ice valves are electrically controlled, pneumatically operated, pressure-regulating
shutoff valves. The valves reduce the high 14th-stage bleed air pressure to a level suitable for
anti-icing of the engine intake cowl and T2 probe. The valves are fail-safed to the open position.
Therefore, if electrical power is lost, and bleed air is available, the cowl anti-ice valves will move
to the open position.
Selecting a COWL switch/light commands the corresponding cowl anti-ice valve to open. When
the valve opens, the COWL switch/light illuminates when sufficient pressure is sensed by the
pressure switch, and the COWL A/ICE ON advisory EICAS message appears.
　
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