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is increased slightly and ducted to the mix manifold
PDPS PDPS
Aft Pressure Bulkhead
Water
Extractor
To Mixing
Manifold
To Mixing
Manifold
Condenser
Reheater
Pack Temperature
Sensor (PTS)
Air Cycle
Machine
(ACM)
Temperature
Control
Valve
(TCV)
Plenum
Primary
Heat
Exchanger
Water
sprayer
Flow Control
Valve (FCV
Suck In
Door
Ram Air Valve
Bleed Air Bleed Air
Water
Extraction
Loop
Main Heat
Exchanger
Pack Discharge Temperature
Sensor (PDTS) PDTS
PTS
FCV
ACM
TCV
Ram
Air
Inlet
Check Valve
Pack
Discharge
Pressure
Sensor
Compressor
Pneumatic
Overheat
Sensor
Compressor
Discharge
Temperature
Sensor
CPNOH
CDTS
CPNOH
CDTS
GX_13_021
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
13-24 For Training Purposes Only
Sept 04
The cooling packs are shut off (FCV closed) under the following circumstances:
• In AUTO operation by the ACSC acting on the FCV torque motor due to:
• Bleed failure or shutdown (on BMC demand)
• Engine starting (on BMC demand)
• During ditching operation if airplane is below 15,000 feet
• Pack inlet overheat
• Compressor discharge overheat
• Pack discharge overheat
• Pack discharge underpressure
• In AUTO or MANUAL operation by the Compressor Pneumatic Overheat Sensor
(CPNOH) acting pneumatically on the FCV actuator due to:
• Compressor discharge overheat
• By crew selection on PACK switch acting on the FCV solenoid
BLEED
L PACK
15°C
FCV
L PACK
FAIL
OFF
GX_13_022
L PACK FAIL
L PACK OFF
L PACK
FAIL
OFF
L PACK
FAIL
OFF
GX_13_023
BLEED
L PACK
12°C
For Training Purposes Only
Sept 04
13-25
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
AUXILIARY PRESSURIZATION
The auxiliary pressurization system provides an alternate pressurization source for the
cabin in the event of the loss of both cooling packs.
The AUX PRESS switch, when selected ON, sends a signal to each ACSC. The ACSC
commands the HASOVs to mid position and the trim valves to full open to use trim air
for pressurization.
The recirculation system should be selected ON to reduce the supply temperatures in
the distribution ducts. Duct overheat detection is carried out by the ACSCs.
An EICAS message is displayed when AUX PRESS switch is selected ON.
AUX PRESS
ON
AUX PRESS
ON AUX PRESS ON
RAM AIR
AUX PRESS ON
TRIM AIR
BLEED BLEED
10 °C 10 °C
40 °C 42 °C 41 °C
L PACK R PACK
GX_13_024
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
13-26 For Training Purposes Only
Sept 04
TEMPERATURE CONTROL
In normal operation, with the packs in AUTO mode and trim system ON, the pack
discharge temperature is automatically controlled by the ACSC.
Each ACSC is divided into two fully redundant channels, A and B. During operation
one channel is active and controlling the ECS. The inactive channel also computes the
control data but does not command outputs.
ACSC 1 (left side of the aircraft) controls the temperature in the cabin via the forward
and aft trim air valves. ACSC 2 (right side) controls the cockpit temperature and
cockpit trim air valve.
Honeywell
EICAS PRIMARY DISPLAY AIR CONDITIONING
SYNOPTIC PAGE
DAU
3
DAU
4
DAU
1
DAU
2
LEFT
SYSTEM
VALVES
RIGHT
SYSTEM
VALVES
LEFT
SYSTEM
SENSORS
RIGHT
SYSTEM
SENSORS
ACSC
1
ACSC
2
AIR COND
PANEL
A
B
MAN
A
B
MAN
DC BUS 1 DC BUS 1
DC BUS 2 DC BUS 2
DC ESS DC ESS
ASCB
ARINC
429
SPDAs SPDAs
PACK CONTROL
L MAN
TEMP
R MAN
TEMP
BLEED/AIR COND
TEMPERATURE
FWD CABIN
NORM
MAN
LO HIGH
COLD HOT
L PACK R PACK
FAIL
OFF
FAIL
OFF
RECIRC TRIM AIR
OFF OFF
OLD HO
RAM AIR
AUX PRESS
HOT
COLD
HOT
COLD
ON
ON
AFT CABIN
COLD HOT
COCKPIT
COLD HOT
BMC
1
PILOT
　
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