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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 sensor (ADS) anti-ice system consists of
integral, self regulating, heating elements for the air data sensors and probes. The ADS
heaters prevent ice formation that may cause erroneous air data information. ADS anti-icing
is achieved by electronically controlling the heating elements. The air data sensor heating
system is activated automatically on the ground and in flight.
The ground mode has two operational heating modes, automatic and manual. In automatic
mode, when either engine generator is on and the LH and RH PROBES switches, (on the
ANTI--ICE control panel) are OFF, the LH and RH pitot probes and the standby pitot probe
are heated at half power (automatic mode is not functional when the aircraft is being
powered by the APU generator or external power). The static ports and the AOA vanes are
not powered automatically in the ground mode. For manual mode, the static ports and the
AOA vanes can be heated by selecting the LH and RH PROBES switches to ON.
In the flight mode, the automatic control function is completely independent of the control
switches. The controllers automatically supply full power to all the air data probes and
sensors. The LH and RH PROBES switches have no effect on the function of the
controllers.
The air data probes and sensors are monitored and controlled by three independent and
identical controllers. Controller 1 monitors the heater elements for the left pitot, left angle of
attack (AOA) vane and left static port. Controller 2 monitors the right pitot, right AOA vane
and right static port. Controller 3 monitors the standby pitot and total air temperature (TAT)
probe.
Vol. 1 15--50--2
ICE AND RAIN PROTECTION SYSTEM
Air Data Sensor Anti--Ice System Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
Air Data Sensor Anti---Ice System
Figure 15---50---1
RIGHT PITOT
HEATER
RIGHT STATIC
PORT HEATER
LEFT PITOT
HEATER
LEFT AOA
VANE HEATER
LEFT STATIC
PORT HEATER
STANDBY PITOT
HEATER
TAT HEATER
RIGHT AOA
VANE HEATER
PROBES LH and RH
Used to manually activate the air
data sensor anti--ice systems.
During normal flight operations,
all heaters are automatically
controlled, regardless of switch
position.
Anti--Ice Control Panel
Overhead Panel
Vol. 1 15--50--3
ICE AND RAIN PROTECTION SYSTEM
Air Data Sensor Anti--Ice System Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
Air Data Sensor Anti---Ice EICAS Indications <1001>
Figure 15---50---2
L or R AOA HEAT caution (amber)
Indicates that respective angle of attack
heater is off or has failed.
L or R PITOT HEAT caution (amber)
Indicates that respective pitot tip
heater is off or has failed. Also
indicates that respective pitot base
heater is off or has failed in flight.
TAT PROBE HEAT caution (amber)
Indicates that total air temperature probe
heater has failed with AC bus 1 powered.
L or R STATIC HEAT caution (amber)
Indicates that respective static port
heater is off or has failed.
ADS HEAT TEST OK advisory (green)
Indicates that the air data sensor anti--ice
system was tested successfully.
STBY PITOT HEAT caution (amber)
Indicates that standby pitot heater is off
or has failed.
Primary Page
Status Page
Vol. 1 15--50--4
ICE AND RAIN PROTECTION SYSTEM
Air Data Sensor Anti--Ice System Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
TAT Heater HEATERS
TAT
AC BUS 1
A12
HEATERS
PITOT R
A14
Pitot Heaters
HEATERS
PITOT L T7
HEATERS
PITOT STBY
AC
ESSENTIAL 1 T9
AOA Heaters
HEATERS
AOA L T8
Air Data
Sensor
HEATERS
AOA R AC BUS 1 A13
Anti-Ice
Static Heaters
HEATERS
STATIC R DC BUS 1 G14
HEATERS
STATIC L S1
HEATERS
ADS CONT 1 DC
ESSENTIAL
2
S2
Controllers
HEATERS
ADS CONT
STBY
S3
HEATERS
ADS CONT 2 DC BUS 1 1 G13
ICE AND RAIN PROTECTION SYSTEM Vol. 1 15--60--1
Windshield and Side Window Anti--Ice
System Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
1. WINDSHIELD AND SIDE WINDOW ANTI--ICE SYSTEM
Windshield and side window anti-icing is achieved by electrically heating the windshield and
　
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