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overheat protection. When an automatic overheat shutdown occurs, cargo heat to
the related compartment cannot be restored in flight. The EICAS advisory
message CARGO HEAT BULK notifies the flight crew when the switch is off or
a shutdown occurs.
The aft cargo compartment is heated by warm exhaust air from the aft equipment
cooling system.
787 Flight Crew Operations Manual
Air Systems -
Air Conditioning System
Description
Boeing Proprietary 2.20.5
Forward Cargo Compartment Air Conditioning System
The forward cargo compartment air conditioning system provides temperature
control and conditioned air for the transport of perishable, live, or other
temperature sensitive cargo. Automatic ventilation ensures that odors do not go
from the cargo compartment to the flight deck or passenger cabin.
Selecting the FWD CARGO A/C control to AUTO disables the forward cargo
heating system and allows the selection of a target temperature for the forward
cargo compartment. Target and actual temperatures are displayed on the AIR
synoptic.
The flight crew can set the forward cargo compartment temperature control
reference to between 4 and 27 degrees C using the FWD CARGO A/C control.
Note: If the flight deck control fails, the packs maintain the last selected target
temperature.
Normal forward cargo heating is provided when the FWD CARGO A/C control is
in the OFF position. The selected temperature display on the AIR synoptic is
blanked.
The EICAS advisory message CARGO A/C FWD is displayed when a fault is
detected in the forward cargo compartment air conditioning system.
787 Flight Crew Operations Manual
Air Systems -
Air Conditioning System
Description
2.20.6 Boeing Proprietary
Air Conditioning System Schematic
VENTILATION
NORM
FAULT
ON OFF
L PACK R PACK
AUTO
CABIN
TEMP
AIR COND
RESET
TEMP
FLT DECK
RECIRC FANS
ON
LOWER
ON
UPPER
EQUIP COOLING
AFT
AUTO
FWD
AUTO
AIR CONDITIONING
TRIM AIR
C W C W
L R
F/D flight deck WAI wing anti ice valve
ANTI-ICE PACKS
CABIN AIR COMPRESSOR
FLIGHT DECK
PASSENGER CABIN
AIR DISTRIBUTION
FLT DECK + B + D
TRIM HEAT
FLT DECK + A + C
TRIM HEAT
70
FLT DECK A
TEMP
MASTER
OCCUPANTS
CABIN
201
L PACK L TRIM AIR R R PACK
COOLING
STBY
LOAD SHED
UPPER
RECIRC
LOWER
LOAD SHED
RECIRC
F
B
21
C
21
D
21 21 21
FWD AFT BULK
1 2 3 4
21
20 20 20 20 20
40 70
ALTERNATE
VENT
70
PRELIMINARY
787 Flight Crew Operations Manual
Air Systems -
Air Conditioning System
Description
Boeing Proprietary 2.20.7
Equipment Cooling, Equipment Ventilation, Lavatory and
Galley Ventilation
The forward equipment cooling and ventilation systems provide cooling and
ventilation for the electrical and electronic equipment on the flight deck and in the
forward electrical and electronic (E & E) compartment equipment racks.
The forward systems use internal fans and valves to direct air drawn from the
cabin to the equipment and ventilates the warm exhaust air into the forward
outflow valve or the forward cargo compartment, if the compartment requires
additional heat. There are two cooling system supply fans, a primary and a backup.
If the primary supply fan fails, the backup supply fan operates automatically.
The forward system reconfigures automatically to an override mode when:
• the FWD EQUIP COOLING switch is off, or
• in flight, both supply fans fail, or
• in flight, low airflow is detected, or
• smoke is detected in the forward equipment cooling system or the forward
equipment ventilation system, or
• the FWD CARGO FIRE ARM switch is ARMED
In the override mode when the FWD CARGO FIRE ARM switch is not ARMED,
the vent valve opens, both supply fans are inoperative, and the forward cargo heat
valve is closed.
In the override mode when the FWD CARGO FIRE ARM switch is ARMED, the
vent valve remains closed, both supply fans are inoperative, and the forward cargo
heat valve is closed.
Cabin differential pressure draws air through the flight deck panels and into the
forward E & E equipment compartment to create a reverse flow of air across the
equipment, then through the override valve to an overboard vent.
The override mode supplies adequate cooling while the airplane is in cruise, but
the airflow decreases as the airplane descends as the cabin pressure differential
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787机组操作手册Flight Crew Operations Manual 1(128)
