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PASSENGER CABIN BULKHEAD
RAM AIR
INLET
(HIGH PRESSURE
PNEUMATIC SUPPLY)
Pressurized and
conditioned by air
conditioning
system.
Pressurized by air
exhausted from
cockpit/cabin
no temperature
control.
Heated by exhaust
air from
electronics
chassis.
Unpressurized
LEGEND
FLIGHT
COMPARTMENT
CONNECTION
GROUND
POWER
UNIT
AUXILIARY
POWER
UNIT
GASPER
SYSTEM
SOV
POSITION
VALVE
DUAL
PACK
PRSOV’s
10 TH
STAGE
10 TH
STAGE
R/H
SOV
L/H ISOL
SOV
Vol. 1 08--20--1
REV 56, Jan 31/03
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System
Flight Crew Operating Manual
CSP A--013
MASTER
1. AIR--CONDITIONING SYSTEM
There are two air-conditioning systems, which can be operated separately or in parallel, to
supply conditioned air to the flight and passenger compartments. Each system consists of
an air-conditioning unit or package (PACK), a temperature controller and ducting. Ram air is
provided for pack cooling and ventilation. The temperature controllers also control the
engine 10th stage bleed air supply to the system (see Chapter 19).
REV 56, Jan 31/03
Vol. 1 08--20--2
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System
Flight Crew Operating Manual MASTER
CSP A--013
Air Conditioning System
Figure 08---20---1 Sheet 1
Vol. 1 08--20--3
REV 56, Jan 31/03
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System
Flight Crew Operating Manual
CSP A--013
MASTER
Air Conditioning System
Figure 08---20---1 Sheet 2
REV 56, Jan 31/03
Vol. 1 08--20--4
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System
Flight Crew Operating Manual MASTER
CSP A--013
A. Packs
The packs are located in the aft equipment compartment. They provide cooling of the
engine or APU bleed air supplies for distribution to the flight and passenger
compartments. 10th stage bleed air to each pack is regulated to a constant 30 psi by
respective pressure regulator and shutoff valves (PRSOV). For single pack operation,
the PRSOV will regulate the pressure to 41 psi. Each pack consists of an air cycle
machine and heat exchanger which are used to decrease the temperature and water
content of the bleed air used in the conditioning process. Normally, the right pack
supplies the passenger compartment and the left pack supplies the flight compartment.
If a pack fails, the remaining pack can supply conditioned air to both compartments.
Vol. 1 08--20--5
REV 56, Jan 31/03
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System
Flight Crew Operating Manual
CSP A--013
MASTER
Air Conditioning Pack
Figure 08---20---2
A
A
REV 56, Jan 31/03
Vol. 1 08--20--6
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System
Flight Crew Operating Manual MASTER
CSP A--013
Air Conditioning System --- Controls <MST>
Figure 08---20---3
Used to control operation of air conditioning
packs.
When pressed in, associated pack
pressure regulating/shut--off valve opens,
permitting airflow into pack. OFF (white)
light goes out.
When pressed out, associated pack
pressure regulating/shut--off valve closes,
shutting down airflow into pack. OFF (white)
light comes on and EICAS displays L/R
PACK OFF status message.
Amber FAULT light comes on:
When overpressure occurs between
primary heat exchanger and compressor
section of pack.
RAM AIR Ventilation
Switch/Light
(Guarded)
Used when both packs fail. Provides ambient air to
left conditioned air (cockpit) supply duct.
When pressed in, ram air vent valve opens and
supplies air into cockpit supply duct. OPEN (white)
light comes on. EICAS displays RAM AIR OPEN
status message and ECS page indicates valve
position.
When pressed out, ram air valve closes and
OPEN light goes out. EICAS ECS page indicates
valve at closed position.
Control Switch/Light
Used to select manual
mode temperature control.
When pressed in, selects
manual control and light
comes on green and
EICAS indicates CKPT/
CABIN TEMP MAN.
When pressed out, selects
automatic control and light
goes out.
Manual Mode -- Temperature
Air--Conditioning Panel
Overhead Panel
Left and Right PACK
Switch/Lights
<0013>
<0034>
<0074>
<0043>
　
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