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leading edges when NORM mode is selected. The wing anti-ice controller is bypassed
when STBY mode is selected.
Leading
Edge Skin
Piccolo
Tube
Shroud
EXHAUST LOUVERS
P604_14_001
Sensors






Overheat/Sufficient Heat
Control
Standby Thermal Switch
Exhaust Louvers
(on Lower Surface)
ICE AND RAIN PROTECTION
14-4 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
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.
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 130°C/265°F or greater, the WING
OVHT warning EICAS message will appear, accompanied by the “WING
OVERHEAT” voice warning and the flashing MAST WARN 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 antiicing.
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 14-1).
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
　
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