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Each cowl anti-ice system also contains an overpressure relief valve mounted downstream
of the cowl anti-ice valves. When an overpressure condition occurs, the relief valve opens to
dump the excess pressure overboard and an indicator extends out the nose cowl to indicate
that the relief valve is open. After an overpressure, the relief valve remains open and the
indicator is visable during a walkaround. Maintenance should be advised before resetting
the relief valve.
Valve status is displayed on the EICAS, ANTI--ICE synoptic page.
REV 56, Jan 31/03
Vol. 1 15--40--2
ICE AND RAIN PROTECTION SYSTEM
Engine Cowl Anti--Ice System
Flight Crew Operating Manual MASTER
CSP A--013
Cowl Anti---Ice Control and Primary Page Instructions <MST>
Figure 15---40---1
L COWL A/ICE
Primary Page
<0039>
R COWL A/ICE
L, R COWL A/ICE caution (amber)
Comes on to indicate failure of cowl
anti--ice valve.
If applicable cowl anti--ice valve is
switched on then the message
indicates insufficient pressure.
If applicable cowl anti--ice valve is
switched off, the message indicates
pressure is in the system (i.e., valve
failed open).
Anti--Ice Panel
<0006>
COWL Anti--Ice LH/RH Switches
Controls operation of cowl anti--ice
shut--off valves.
ON -- Opens applicable cowl
anti--ice shut--off valve, to provide
14th stage bleed air to the cowl
and T2 probe at the engine inlet.
OFF -- Closes applicable cowl
anti--ice shutoff valve.
Vol. 1 15--40--3
REV 56, Jan 31/03
ICE AND RAIN PROTECTION SYSTEM
Engine Cowl Anti--Ice System
Flight Crew Operating Manual
CSP A--013
MASTER
Cowl Anti---Ice Status Page Indications <MST>
Figure 15---40---2
WING / COWL A/I ON advisory (green)
Comes on to indicate that the wing and
cowl anti--ice systems have been selected
on and are operating normally.
COWL A/I ON (L, R) advisory (green)
Comes on to indicate that the applicable
cowl anti--ice system has been selected
on and is operating normally.
COWL A/I ON advisory (green)
Comes on to indicate that both cowl
anti--ice systems have been selected
on and are operating normally.
Status Page
<0039>
<0039>
REV 56, Jan 31/03
Vol. 1 15--40--4
ICE AND RAIN PROTECTION SYSTEM
Engine Cowl Anti--Ice System
Flight Crew Operating Manual MASTER
CSP A--013
Cowl Anti---Ice Synoptic Page Indications <MST>
Figure 15---40---3
Anti--Ice Page
Right Cowl Anti--Ice Valve
Right Cowl Piccolo
Tube and Duct
Green -- Operational
Amber -- Cowl anti--ice
failure.
Left Cowl Anti--Ice Valve
Indicates open (white)
Indicates invalid data
(half--intensity magenta)
CMD (cyan)
Reflects the position of the
valve as selected on the
anti--icepanel.
NOTE
Failure of an anti--ice valve is
indicated by valve outline
turning amber.
Wing Anti--Ice Flow Line
(green)
Comes on (with applicable
EICAS advisory message)
to indicate that wing anti--ice
system has been selected
on and is operating normally.
Cowl Anti--Ice Flow Line
(green)
Comes on (with applicable
EICAS advisory message)
to indicate that applicable
cowl anti--ice system has
been selected on and is
operating normally.
<0039>
<0039>
Indicates closed (white)
Vol. 1 15--40--5
REV 56, Jan 31/03
ICE AND RAIN PROTECTION SYSTEM
Engine Cowl Anti--Ice 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
Engine Cowl
Cowl Anti-Ice
A/ICE VALVE
L ENG
DC BAT 2
N3
Anti-Ice
Anti Valves A/ICE VALVE
R ENG
N4
REV 56, Jan 31/03
Vol. 1 15--40--6
ICE AND RAIN PROTECTION SYSTEM
Engine Cowl Anti--Ice System
Flight Crew Operating Manual MASTER
CSP A--013
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 15--50--1
REV 56, Jan 31/03
ICE AND RAIN PROTECTION SYSTEM
Air Data Sensor Anti--Ice System
Flight Crew Operating Manual
CSP A--013
MASTER
1. AIR DATA ANTI--ICE SYSTEM
Air data probes and sensors are located on the left and right sides of the forward fuselage
and extend into the airstream. The air data probes and sensors are monitored and
controlled by three independent and identical air data sensor heater controllers (ADSHC’s).
Controller 1 monitors the heater elements for the left pitot, left and right base heaters, left
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