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synoptic page.
2. T2 SENSOR PROBE ANTI--ICING
A fan inlet temperature sensing probe (T2), mounted on the engine cowling, is used to
provide temperature data to the FADEC. The FADEC uses the information as one of the
sensing parameters to set engine power and to control the compressor variable geometry
stator vanes. The probe also contains a built--in heating element that is used to anti--ice the
probe. Electrical heating power to the probe heating element is controlled by the FADEC.
Testing of the T2 heater function is done automatically by the FADEC, which initiates a
system check after engine shutdown on the ground. Following right engine shutdown,
electrical power must be maintained on the aircraft for at least one minute to make sure that
the FADEC has sufficient time to successfully complete the test. The FADEC verifies T2
heater function by energizing the heater and looking for an appropriate temperature rise
during a 30 second period.
Following a successful test, the next test will be initiated after the next ground engine
shutdown. If the FADEC (through channel A ) cannot energize the T2 heater, the FADEC will
automatically switch to channel B to conduct the test (after a 30 second time delay). If the
T2 heater test fails on both channels, the respective L/R ENG TAT HEAT caution message
will be displayed on the EICAS primary page and the FADEC will not attempt to energize the
T2 heater.
Vol. 1 15--40--2
ICE AND RAIN PROTECTION SYSTEM
Engine Cowl Anti--Ice System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Engine Cowl Anti---Ice System --- General
Figure 15---40---1
Anti--Ice Control Panel
Overhead Panel
COWL
ANTI--ICE
VALVE
TO EICAS
HIGH
PRESSURE
VALVE
L PRSOV
LOW
PRESSURE
PORTS
HIGH
PRESSURE
PORTS
COWL ANTI--ICE
EJECTOR PICCOLO TUBE
NOZZLE
BLEED LEAK
PRESSURE
TRANSDUCER
NOTE
LEFT SIDE SHOWN RIGHT
SIDE THE SAME
COWL LH or RH
Used to control engine
cowl anti--ice systems.
Vol. 1 15--40--3
ICE AND RAIN PROTECTION SYSTEM
Engine Cowl Anti--Ice System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Anti---Ice Synoptic Page
Figure 15---40---2
Anti--Ice Page
ANTI--ICE
ICE DET 1 FAIL
WING A/ICE SNSR
BRT
ICE
OVHT OVHT
Vol. 1 15--40--4
ICE AND RAIN PROTECTION SYSTEM
Engine Cowl Anti--Ice System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Engine Cowl --- Anti---Ice EICAS Indications <1001>
Figure 15---40---3
L or R COWL A/I DUCT status (white)
Indicates that respective cowl duct pressure
is less than 3.12 psig or greater than 53.1 psig
with battery bus powered.
COWL A/I ON advisory (green)
Indicates that both left and right cowl
anti--ice valves are open when selected on.
WING/COWL A/I ON advisory (green)
Indicates that both wing and cowl anti--ice
systems are on and operating normally.
L or R COWL A/I ON advisory (green)
Indicates that the left or the right cowl anti--ice
valve is open.
Primary Page
Status Page
L or R COWL A/I OPEN caution (amber)
Indicates that respective cowl anti--ice valve
failed to close when selected off.
L or R COWL A/I caution (amber)
Indicates that the respective cowl
anti--ice valve failed to open when
selected on or valve position can not
be determined.
L or R ENG TAT HEAT caution (amber)
Indicates that the respective T2 heater
has failed.
L or R COWL A/I DUCT warning (red)
Indicates that a bleed leak is detected by
the leak pressure transducer in the cowl
anti--ice duct.
Vol. 1 15--40--5
ICE AND RAIN PROTECTION SYSTEM
Engine Cowl Anti--Ice System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Anti-Ice
A/ICE VALVE
L ENG BATTERY
2
N3
Engine Cowl
Anti-Ice
Anti Valves A/ICE VALVE
R ENG
BUS N4
Anti T2 Heaters
T2 HEATER L DC BUS 1 1 F4
T2 HEATER R DC BUS 2 2 F4
Vol. 1 15--40--6
ICE AND RAIN PROTECTION SYSTEM
Engine Cowl Anti--Ice System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 15--50--1
ICE AND RAIN PROTECTION SYSTEM
Air Data Sensor Anti--Ice System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
1. AIR DATA ANTI--ICE SYSTEM
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