787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Air Systems -
Air Conditioning System
Description
Copyright © The Boeing Company. See title page for details.
2.20.4 D615Z003-TBC
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.
[Option – English / Metric units]
The CABIN TEMP selector sets a master reference temperature between 65º F
and 85º F / 18º and 29º C. The master reference temperature is increased or
decreased automatically or manually to set target temperatures for each
temperature zone.
[Option – English / Metric units]
The target temperatures of each passenger cabin temperature zone may be further
modified plus or minus 10º F / 6º C, within the range of 65º to 85º F / 18º to
29º C, using the cabin management system.
[Option – English / Metric units]
The flight deck temperature selector sets the flight deck temperature to between
65º and 85º F / 18º and 29º C.
The temperature zone requiring the coolest temperature controls the pack outlet
temperature.
[Option – English / Metric units]
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 75º F / 24º C.
Crew Rest Area Temperature Control
[Option – Crew rest]
Crew rest area temperature can be controlled manually by the heater controls in
the compartments. (Refer to Temperature Control Panel
in Chapter 1, Section 46,
for additional information.)
February 15, 2010
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