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SYSTEMS SELECT
NORM
MFD 1 MFD 2
AIR CONDITIONING
RAM AIR
BLEED
TRIM AIR
BLEED
LOW HIGH
12 °C 12 °C
23 °C 23 °C 23 °C
L PACK R PACK
CKPT
20°C
19°C 21°C 22°C
FWD
20°C
AFT
23°C
EICAS CONTROL PANEL
Selected Temperature
Duct Supply
Temperature
Trim Air
Valve
Air Conditioning
Package (PACK)
Ram Air
Valve (RAV)
Hot Air Shutoff
Valve (HASOV)
Flow Control
Valve (FCV)
PACK Flow
Output
Pack Discharge
Temperature
Mix Manifold
Compartment Temperature
GX_13_018
For Training Purposes Only
Sept 04
13-21
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
FLOW CONTROL SYSTEM
The flow control system regulates airflow from the pneumatic duct to the air
conditioning units. The flow control system interfaces with:
• Bleed Air System – The flow control system takes bleed air from the engine, the
APU, or a ground source, and provides filtered air into the air conditioning units
• Air Conditioning System Controllers (ACSC) which measure, calculate and
control the airflow
• Air Conditioning Units (packs) which use the filtered air supply
A flow control valve (FCV) will modulate to meet a preset flow schedule and is
normally controlled by the Air Conditioning System Controller (ACSC).
When an overheat is detected, the ACSC will automatically close the FCV and display
the appropriate caution message on EICAS.
L PACK FAIL
L PACK
FAIL
OFF
BLEED
L PACK
15°C
BLEED AIR FROM
PNEUMATIC SYSTEM
TO ACSC
PACK INLET
TEMPERATURE SENSOR
BLEED FILTER
SCAVENGE AIR LINE
TO RAM AIR OUTLET DUCT
OZONE CONVERTER
PACK INLET
PRESSURE SENSOR
TO ACSC
P
P
PACK INLET
FLOW SENSOR FLOW SENSOR
VENTURI
COOLING
PACK
-Full closed position
to ACSC
-Torque motor control
from ACSC
-ON/OFF solenoid command
from cockpit panel
TO TRIM AIR
AUXILIARY
FLOW CONTROL
VALVE
FCV
GX_13_019
PRESSURIZATION
SYSTEM
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
13-22 For Training Purposes Only
Sept 04
Flow selections are as follows:
BLEED
LOW
L PACK
HIGH
L PACK
NORM:
The flow demand per pack decreases linearly
with airplane altitude from 30 lb/min at sea level
to 18 lb/min at 51,000 feet.
Flow is limited to a maximum value of 40lb/min
per pack. The BMC will prevent two packs being
supplied by one engine.
In case of single pack operation, the high flow
schedule is automatically selected by the ACSC.
HIGH:
The flow demand per pack decreases linearly
with airplane altitude from 40 lb/min at sea level
to 23 lb/min at 51,000 feet (controlled by ACSC).
LO:
The flow demand is half, 20 lb/min, of the high
flow demand but is limited to a minimum of
18 lb/min (controlled by the ACSC).
MAN:
The flow control valve is driven to the full open
position (ACSC is disabled).
GX_13_020
PACK CONTROL
NORM
MAN
LO HIGH
PACK CONTROL
LO
PACK CONTROL
NORM
MAN
LO HIGH
PACK CONTROL
LO
PACK CONTROL
NORM
MAN
LO HIGH
PACK CONTROL
LO
PACK CONTROL
NORM
MAN
LO HIGH
For Training Purposes Only
Sept 04
13-23
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
COOLING PACKS
The cooling packs function as follows:
• Bleed air flows through the FCV into the primary heat exchanger, where it is
cooled by ram air
• From the primary heat exchanger the air flows into the compressor of the air cycle
machine where the temperature and pressure are increased
• From the compressor the air enters the main heat exchanger where the temperature
is further decreased again
• From the main heat exchanger the air passes into the high-pressure water
extraction loop (Reheater/Condenser, Water Extractor) where much of the water is
removed and temperature is further decreased. The water is evacuated into the ram
air cooling flow at the inlet of the heat exchangers to increase cooling efficiency by
evaporation
• From the water extraction loop the air enters the turbine of the air cycle machine
where the temperature and pressure are decreased
• From the turbine the air flows back through the condenser where the temperature
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