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Vol. 1 08--20--7
REV 56, Jan 31/03
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System
Flight Crew Operating Manual
CSP A--013
MASTER
Air Conditioning --- EICAS Messages <MST>
Figure 08---20---4
Primary Page
<0039>
<0006>
PACK OFF L/R
status (white)
Comes on to indicate that respective
air conditioning pack has been shut
down. Corresponds to PACK L/R
switch/lights indicating OFF (white).
RAM AIR OPEN
status (white)
Comes on to indicate that ram air
valve has been selected open.
Corresponds to RAM AIR switch/light
indicating OPEN (white).
Status Page
<0039>
<0039>
PACK HI PRESS L/R
caution (amber)
Comes on when a high pressure
(51 psi) is sensed in respective
air conditioning pack’s outlet duct.
Corresponds to PACK L/R switch/lights
indicating FAULT (amber).
REV 56, Jan 31/03
Vol. 1 08--20--8
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System
Flight Crew Operating Manual MASTER
CSP A--013
Air Conditioning System --- Synoptic Page Indications <MST>
Figure 08---20---5
Environmental Control
System Page
Overtemperature
Caution message (amber)
Indicates high temperature
sensed in respective air
conditioning pack’s outlet
corresponds to
PACK HI TEMP L, R caution
on primary page, and PACK
switch/light indicating FAULT.
10th Stage Bleed
Pressure (white)
MANUAL message
(white)
Comes on to indicate
that the respective
CKPT/CABIN MAN
switch/light is selected.
Overpressure
Caution message (amber)
Indicates high pressure
sensed in respective
packs outlet, corresponds
to PACK HI PRESS L, R
caution on primary page
and PACK switch/light
indicating FAULT.
<0039>
Vol. 1 08--20--9
REV 56, Jan 31/03
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System
Flight Crew Operating Manual
CSP A--013
MASTER
B. Temperature Control
The flight compartment and the passenger compartments have identical but
independently-operated temperature control systems. Each controller subsystem is
dedicated to an air-conditioning pack. Temperature control, in automatic mode, is
provided by CKPT and CABIN selector knobs on the air conditioning panel. Control in
manual mode is provided by left and right pack MAN switchlights and HOT/COLD
switches on the same panel. The individual packs can be manually turned OFF by
selecting the respective L or R PACK switchlight on the air conditioning panel.
AUTOMATIC MODE -- Operating Range MANUAL MODE -- Operating Range
14.5_C to 28_C (58_F to 82_F) 1.7_C to 71_C (35_F to 160_F)
NOTE
Manual mode temperature below 3_C (37_F) may
result in icing of the pack water separator and
subsequent cycling of the pack output.
C. Ram Air Ventilation
The cooling air for the left and right heat exchangers is supplied from a ram air intake,
located on the upper aft fuselage. During normal operation, the ram air is exhausted
through an exhaust duct in the lower aft fuselage, after passing over the heat
exchangers. The ram air intake duct also provides cooling air to the hydraulic systems
heat exchanger to cool the hydraulic fluid. (Refer to Chapter 14).
Ram air ventilation is used only when the air conditioning packs fail (unpressurized).
Operating the (guarded) RAM AIR, switchlight on the air--conditioning panel, opens the
normally closed ram air valve. Ram air then enters the left (flight compartment) supply
system. Ram air also flows through the distribution manifold to the passenger
compartment.
D. Conditioned Air Distribution
Conditioned air, from the left and right air-conditioning packs, is routed through
separate ducting systems through a distribution manifold to the flight compartment and
the passenger compartments.
Conditioned air, to the passenger compartment, is distributed from ducts along each
side of the aircraft. Passenger compartment exhaust air is routed underfloor to the
outflow valves on the aft pressure bulkhead.
Conditioned air, to the flight compartment, is distributed to the side console panels,
gaspers and vents, and avionics units within the instrument panel. Dedicated fans and
ducts direct conditioned air over the flight compartment display units. Flight
compartment exhaust air is routed underfloor through the avionics compartment to the
outflow valve at the aft pressure bulkhead.
REV 56, Jan 31/03
Vol. 1 08--20--10
ENVIRONMENTAL CONTROL SYSTEM
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