Boeing 787-8 - Page 473

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.
D615Z003-TBC 2.20.9
Equipment Cooling, Equipment Ventilation, Lavatory and
Galley Ventilation
Forward Equipment Cooling
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 cabin air to the
equipment and then ventilates the warm exhaust air through a dedicated overboard
vent valve or to the forward cargo compartment, if it 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 selected to OVRD, or
• in flight, both supply fans fail, or
Forward E/E
Equipment
Flow/Temp
Sensor
Fwd Cargo
Heat Valve
Fwd Cooling
Vent Fan
Overboard Venturi
Fwd Overboard
Vent Valve
Fwd Cooling
OVRD Valve
Fwd
Supply
Fan
Fwd
Supply
Fan
Flow/Temp
Sensor
Smoke
Detector
Smoke
Detector
Flight Deck
Equipment
FORWARD EQUIPMENT COOLING
February 15, 2010