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Jan 04
P I LOT T R A I N I N G GU I D E
Wing Anti-Ice System
Description
The left and right wing leading edges are anti-iced using pressure-regulated 14th-stage
bleed air, distributed by wing anti-ice ducting and piccolo tubes. The system is
controlled by the WING ANTI-ICE switch located on the ANTI-ICE panel. The
WING ANTI-ICE switch normally controls the left and right wing anti-ice valves via
wing-mounted control sensors and the wing anti-ice controller. An isolation valve
allows both wings to be anti-iced from a single bleed source via a crossover duct.
Panel lights and EICAS messages provide indications of system status during
operation.
Wing Anti-Ice System
Figure 14-1
14TH STAGE
DUCT
FAIL
CLOSED
OPEN
DUCT
FAIL
CLOSED
BLEED AIR
L ISOL R
L
Wing
A/Ice
Valve
R
Wing
A/Ice
Valve
L
14th
SOV
R
14th
SOV
Stby Thermal Switch
Control Sensor
Overheat Sensor
L Cowl
A/Ice
R Cowl
A/Ice
14th-Stage
Bleed Air Port
14th-Stage
Bleed Air Port
WING
ANTI-ICE
CONTROLLER
14th Isol
P604_14_002
BLEED AIR PANEL
R T/R
PDU
L T/R
PDU
ICE AND RAIN PROTECTION
For Training Purposes Only
Sept 04
14-3
P I LOT T R A I N I N G GU I D E
Components and Operation
Anti-Ice Ducts
Bleed air taken from the 14th-stage bleed air manifold is ducted to the wing and
ejected from piccolo tubes onto the inner surfaces of the leading edge. After heating
the leading edges, the air is exhausted overboard through louvers located beneath each
wing leading edge. The piccolo tubes extend the full length of the leading edges.
Wing Anti-Ice Components
Figure 14-2
Wing Anti-Ice Valves
The left and right wing anti-ice valves are electrically controlled, pneumatically
operated, pressure-regulating shutoff valves. The valves are spring-loaded to the
closed position when no 14th-stage pressure is available or electrical control power is
lost. The wing anti-ice system is normally operated in the NORM mode. A backup
mode (STBY mode) exists should NORM mode fail.
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.
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
　
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