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ICE 1, 2 advisory (green)
Comes on to indicate that ice has been
detected (by respective detector) and that
wing/cowl anti--ice systems are on.
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Vol. 1 15--20--5
REV 56, Jan 31/03
ICE AND RAIN PROTECTION SYSTEM
Ice Detection System
Flight Crew Operating Manual
CSP A--013
MASTER
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Ice Detection Ice Detectors
ICE DET 1 AC ESS 3 B8
System ICE DET 2 AC BUS 2 2 C7
REV 56, Jan 31/03
Vol. 1 15--20--6
ICE AND RAIN PROTECTION SYSTEM
Ice Detection System
Flight Crew Operating Manual MASTER
CSP A--013
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 15--30--1
REV 56, Jan 31/03
ICE AND RAIN PROTECTION SYSTEM
Wing Anti--Ice System
Flight Crew Operating Manual
CSP A--013
MASTER
1. WING ANTI--ICE SYSTEM
The wing anti-ice system prevents ice formation on the wing leading edges by heating the
surfaces with hot 14th stage engine bleed air. The hot bleed air is supplied through
insulated ducting and released through piccolo tubes to the inner surface of the wing leading
edges. When normal anti--icing is selected, the wing leading edges are maintained at a
constant temperature to shed ice and to prevent further ice accumulation.
The wing anti-ice system is divided into identical left and right systems. In normal operation,
each engine supplies hot bleed air to its respective wing anti-ice system. The systems are
connected by a, normally closed, 14 stage isolation valve. In the event one system fails, the
isolation valve is opened to permit cross bleeding between systems. This ensures that wing
anti--icing is maintained to both systems.
The system is manually activated and is automatically controlled by an anti-ice temperature
controller located in the aft equipment compartment. The anti-ice temperature controller
controls the wing anti-ice system by using inputs, received from temperature sensors located
on each wing leading edge, to modulate the wing anti-ice valves to provide sufficient hot air
to the leading edges to prevent ice formation.
REV 56, Jan 31/03
Vol. 1 15--30--2
ICE AND RAIN PROTECTION SYSTEM
Wing Anti--Ice System
Flight Crew Operating Manual MASTER
CSP A--013
Wing Anti---Ice System
Figure 15---30---1
PRESSURE
SWITCH
LWING ANTI--ICE VALVE
ISOLATION
CONTROLLER
SHUTOFF
VALVE
EICAS
NOTE
VALVE
System schematic is shown for the right side,
the left side is equivalent.
LEADING EDGE
TEMPERATURE
SENSORS
COWL
ANTI--ICE
VALVE
TO ENGINE
T2 SENSOR
RELIEF VALVE 14 th STAGE ENGINE
BLEED AIR
Vol. 1 15--30--3
REV 56, Jan 31/03
ICE AND RAIN PROTECTION SYSTEM
Wing Anti--Ice System
Flight Crew Operating Manual
CSP A--013
MASTER
Wing Anti---Ice Controls
Figure 15---30---2
Anti--Ice Panel
Overhead Panel
Bleed Air Panel
Overhead Panel
14TH STAGE Isolation Valve Switch/Light
When pressed in, bleed air isolation valve
opens and OPEN (white) comes on.
When pressed out, isolation valve closes
and OPEN light goes out.
WING Anti--Ice Switch
Controls operation of left and right wing (modulating and shutoff) valves.
14TH STAGE L/R Switch/Lights
When pressed in, associated bleed air shutoff valve opens and
CLOSED (white) goes out. When pressed out, valve closes and
CLOSED (white) comes on.
DUCT FAIL (red) -- Comes on if sensors detect a failure in
associated duct section. DUCT FAIL goes out when the failed
duct is isolated and temperature sensor cools.
Failure Switch/Light
Wing Overheat/Duct
Used to test bleed air leak detection
system and to indicate failures/
overtemperature conditions.
OVHT (red) -- OVHT light comes on
when overheat condition exists in
wing leading edge.
DUCT FAIL (red) -- Light comes on
when bleed air leak is detected in
wing left or right anti--ice ducts.
Light goes out when the failed duct
is isolated and temperature sensor
cools.
TEST -- When switch is pressed,
the normal mode of the overheat
system is tested. WING OVHT
warning message, ”Wing overheat”
aural, OVHT light and WING A/ICE
OK status message will come on.
The position of the wing switch
(either STBY, OFF or NORM) does
not alter the test.
REV 56, Jan 31/03
Vol. 1 15--30--4
ICE AND RAIN PROTECTION SYSTEM
Wing Anti--Ice System
Flight Crew Operating Manual MASTER
　
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