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For Training Purposes Only
Sept 04
3-19
P I LOT T R A I N I N G GU I D E
ANTI-ICE SYSTEM (IAMS)
The HBMUs also monitor brake temperature data. The data sent by the Brake
Temperature Monitoring System (BTMS), which incorporates four sensors installed in
the brake housings, provides excessive brake temperature warning to the EICAS Refer
to Chapter 14, LANDING GEAR for more information. The HBMU also controls heat
to Yaw Damper (YD) actuators to ensure that the standby YD actuator is heated. Refer
to Chapter 10, FLIGHT CONTROLS.
The HBMU receives data from various airplane systems via the Data Acquisition
Units (DAU) to control the heaters. The systems that send data to the DAUs are:
• Electronic Engine Controllers (EEC) for the “all heaters off logic and for TAT
probe on/off logic
• Fault Warning Computer (FWC) regarding which ADC is selected for cockpit
display
• Automatic Flight Control System (AFCS) regarding which Yaw Damper is in use
for YD heater control logic
• Air Data Computers (ADC) to provide TAT information to control heat to the Yaw
Dampers and airspeed information for all heaters off logic
• Electrical Load Management System (EMS) provides BUS status and ADG
information for heater control logic
• Weight-On-Wheels (WOW) for all heaters off logic and for TAT probe on/off logic
The heaters are driven to the indicated ON state based on the following logic:
GX_03_030
GROUND / PARK LOGIC ENGINE START INFLIGHT
ALL HEATERS ARE POWERED
"OFF" WHEN:
LEFT ENGINE: OFF
RIGHT ENGINE: OFF
CAS: < 50 KTS
MGWOW: GROUND
Note (1):
Note (2):
YD 1 and 2 turn ON with TAT < -40°C
and YD not engaged.
TAT 1 and 2 turn ON by respective
engine run.
Note (1):
YD 1 and 2 turn ON with TAT < -40°C
and YD not engaged.
Note:
All heaters are tested "ON" when AC
power is applied. It is recommended
to remove all pitot/AOA covers prior
to starting APU or connecting
external power.
HBMU IBIT
AOA 1
AOA 2
PS 1
PS 2
PS 3
PS STBY
TAT 1 ON/OFF Note (2)
TAT 2 ON/OFF Note (2)
TAT 3 OFF
YD 1 ON/OFF Note (1)
YD 2 ON/OFF Note (1)
AOA 1
AOA 2
PS 1
PS 2
PS 3
PS STBY
TAT 1 ON
TAT 2 ON
TAT 3 ON
YD 1 ON/OFF Note (1)
YD 2 ON/OFF Note (1)
ON ON
AND
AND
AND
P I LOT T R A I N I N G GU I D E
ANTI-ICE SYSTEM (IAMS)
3-20 For Training Purposes Only
Sept 04
PROBES
There are four Pitot-Static (PS) probes on the side of the fuselage. They supply pitot
and static pressure to the Air Data Computers and standby instruments. Heater
elements are installed in the PS heads and mounting bases.
There are three Total Air Temperature (TAT) Probes, one on the fuselage and one in
each engine inlet.
There are two AOA probes mounted on the fuselage, one on either side.
The current being drawn by the heater is measured and a heater fault is generated if the
current drawn is less than the minimum required by the particular probe. The fault is
then transmitted to the EICAS.
GX_03_022
PS1
PS3
AOA1
TAT1
TAT2
PS Standby
TAT3
AOA2
PS2
PS3
(Lower)
PS1
(Upper)
AOA1
PS2
(Lower)
PS STANDBY
(Upper)
AOA2
TAT3
TAT
1/2 Probe
L-R AOA HEAT FAIL
PITOT 1-2-3 HT FAIL
STBY PITOT HT FAIL
TAT 1-2 FAIL
GX_03_023
For Training Purposes Only
Sept 04
3-21
P I LOT T R A I N I N G GU I D E
ANTI-ICE SYSTEM (IAMS)
WINDSHIELD HEAT
The Windshield Temperature Control System provides defog and anti-icing for the
Pilot’s and Copilot’s windshield and side window. The system continuously monitors
the temperature of each windshield and side window and maintains the temperature
within specified limits.
WINDSHIELD TEMPERATURE CONTROLLER
There are two dual channel Windshield Temperature Controllers (WTC). The left hand
WTC controls the left windshield heater and the left side window heater. The right
hand WTC controls the right windshield heater and the right side window heater. Both
WTCs are interfaced with the EICAS via different DAUs. The controllers
automatically control the power supplied to the heaters when electrical power is
applied to the system.
The WTC has two totally independent channels. Channel 1 (CH1) monitors and
regulates windshield heating and manages the Channel 1 Built-In-Test (BIT).
The BITE Interface Channel (BIC) monitors and regulates the side window
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