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attendants can reduce outside airflow to the cabin based on the number of airplane
occupants. This reduction is limited to ensure that a minimum air flow is always
supplied to the cabin.
787 Flight Crew Operations Manual
Air Systems -
Air Conditioning System
Description
Boeing Proprietary 2.20.3
Air exhausted from the passenger cabin flows into the upper recirculation system
or to the lower deck, where it is either exhausted overboard through outflow
valves or drawn into the lower recirculation system. Air from the recirculation
fans is mixed with pack air before entering the distribution ducts.
The lower recirculation ducts contain liquid-to-air heat exchangers capable of
additional cabin cooling. Lower recirculation cooling reduces the power required
from the CACs. Lower recirculation cooling is provided by the Integrated Cooling
System (ICS) which is a common galley cooling system.
When upper and/or lower RECIRCULATION FAN switches are OFF, an EICAS
advisory message RECIRC FAN UPR and/or LWR OFF is displayed.
Recirculation fans should remain on to aid in cabin air filtration and cooling of the
feeder wires over the center wing box area.
Alternate Ventilation System
The Alternate Ventilation System (AVS) provides an alternate means of
ventilating the cabin and flight deck in the event both packs are inoperative. The
system consists of a flight deck switch and a dedicated flush inlet valve and duct
that delivers outside air flow downstream of the left pack outlet. When the airplane
is unpressurized, placing the alternate ventilation system switch in the ALTN
position opens a valve allowing fresh outside air to be drawn into the air
distribution system.
Temperature Control
Hot trim air from each pack is added to the pack conditioned air to control the
temperature in each zone. Each trim air system supplies two cabin zone ducts and
one flight deck zone duct.
Cabin zone temperatures are regulated by controlling pack outlet temperature and
adding hot trim air to the zone supply ducts through the trim air valves to meet the
target temperature of each of the seven temperature zones.
The CABIN TEMPERATURE selector sets a master reference temperature
between 18 and 29 degrees C. The master reference temperature is increased or
decreased automatically or manually to set target temperatures for each
temperature zone.
The target temperatures of each passenger cabin temperature zone may be further
modified plus or minus 6 degrees C, within the range of 18 to 29 degrees C, using
the cabin management system.
The flight deck temperature selector sets the flight deck temperature to between
18 and 29 degrees C.
The temperature zone requiring the coolest temperature controls the pack outlet
temperature.
787 Flight Crew Operations Manual
Air Systems -
Air Conditioning System
Description
2.20.4 Boeing Proprietary
If the flight deck or cabin temperature selector setting is unavailable to the pack
temperature controller, the pack outlet temperature is regulated to achieve either
the last temperature set or an average cabin temperature of 24 degrees C.
Crew Rest Area Temperature Control
Crew rest area temperature can be controlled manually by the heater controls in
the compartments.
Temperature Control With Loss of Trim Air
If the left or right trim air system is off, the cabin temperature controllers attempt
to maintain all zones at the average target temperature. Flight deck temperature
will be maintained between 18 and 29 degrees C.
The flight deck may become uncomfortably warm or cool. Setting the CABIN
TEMP selector to a cooler or warmer master temperature may achieve a cooler or
warmer flight deck temperature.
Shoulder and Foot Heaters
Flight crew shoulder heat is provided by electric elements in the side window air
diffusers. The foot heaters have electric heating elements only, with no airflow.
Both are available in flight only.
Cargo Temperature Control System
Cargo Heat System
The fwd and bulk cargo compartments have independent heating systems. An
insulated curtain separates the aft and bulk compartments.
The forward cargo compartment is capable of carrying live animals. With the
FWD CARGO TEMP selector set to AUTO, the fwd cargo heat shutoff valve
opens and the temperature control valve opens/closes to maintain a target
temperature of 24 degrees C. The EICAS advisory message CARGO HEAT FWD
notifies the flight crew if a shutdown occurs or if a selector is off.
Selecting the AUTO setting on the BULK CARGO TEMP switch turns on the
bulk ventilation fan to allow for live animal transport. The system has automatic
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787机组操作手册Flight Crew Operations Manual 1(127)
