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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 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
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
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 to ON commands the corresponding cowl anti-ice valve to open.
When the valve opens, the COWL switch/light will illuminate (as sensed by the by the pressure
switch), and the COWL A/ICE ON advisory EICAS message will appear.
If the cowl anti-ice valve fails to open, the L (R) COWL A/ICE caution EICAS message will be
displayed, indicating insufficient pressure.
ICE AND RAIN PROTECTION
Description
Vol. 2 14−10−5
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENGINE COWL ANTI-ICE SYSTEM (CONT'D)
When the COWL switch/light is deselected, the cowl anti-ice valve is commanded to close.
Should the cowl anti-ice valve remain in the open position (as sensed by the pressure switch),
the L (R) COWL A/ICE caution EICAS message will be displayed, indicating bleed pressure in the
system (valve failed to close).
Pressure Relief Valves
The pressure relief valves provide overpressure protection in the event of cowl anti-ice valve
malfunction. When an overpressure condition occurs, the respective relief valve plunger
extends, dumping excess pressure overboard. When extended, the relief valve plunger is visible
from the ground during external walkaround.
Thrust Reverser Override Function
The cowl anti-ice system is automatically disabled upon thrust reverser operation, since the
14th-stage bleed air cannot simultaneously supply the demands of the thrust reverser and the
cowl anti-ice system. The EICAS caution messages for the cowl anti-ice system are inhibited
during thrust reverser operation.
WINDSHIELD/WINDOW ANTI-ICE SYSTEM
Description
The windshield/window anti-ice system provides a dual-temperature heating function on the
windshield (LOW and HI), and a single-temperature heating function on the side windows (LOW).
When HI is selected, heating of the windshield provides an anti-ice capability on the outer panel,
while also providing a moderate defogging function on the inner surface. The LOW setting
provides defogging to the windshield and window.
In addition to electrically heating the windshield/windows, a footwarmer/demist system is available,
using an electric element and fan, to demist the inside of the windshields. This system uses
recirculated airflow, and is discussed in Chapter 2, Air Conditioning and Pressurization.
ICE AND RAIN PROTECTION
Description
Vol. 2 14−10−6
　
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