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by a switch/light OPEN annunciation (see Figure 14-1).
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.
ICE AND RAIN PROTECTION
For Training Purposes Only
May 03
14-5
P I LOT T R A I N I N G GU I D E
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 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.
Cowl Anti-Ice System
Figure 14-3
PRESS
SWITCH
T2
SENSOR
T/R
PDU
14th-Stage
Bleed Air
Port
Cowl
Anti-Ice
Pressure
Regulating
and SOV
Cowl Anti-Ice
Piccolo Tube
To Wing
Anti-Ice System
Wing
Anti-Ice
Valve
14th-
Stage
Bleed
Air SOV
Note: Generic Cowl
Anti-Ice System
is Shown
Ejector
Pressure
Relief
Valve
P604_14_004
Exhaust
Louver
(Lower
Nacelle)
ANTI-ICE
COWL
L R
HEAT
HEAT
ON ON
ANTI-ICE PANEL
ICE AND RAIN PROTECTION
14-6 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Components and Operation
Cowl Anti-Ice Valves
The cowl anti-ice valves are electrically controlled, pneumatically operated, pressureregulating
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 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.
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 the 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 antiice
system are inhibited during thrust reverser operation.
ICE AND RAIN PROTECTION
For Training Purposes Only
May 03
14-7
P I LOT T R A I N I N G GU I D E
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 windshields/windows, a footwarmer/demist
　
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