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decreases.
In flight, the FWD EQUIP COOLING switch in OVRD aids smoke evacuation
from the flight deck.
On the ground, the EICAS advisory message EQUIP COOLING FWD is
displayed and the ground crew call horn in the wheel well sounds if the forward
equipment cooling system is inoperative.
The aft equipment cooling system provides cooling and ventilating air for the aft
E & E equipment compartment and heating/ventilating air for aft cargo
compartment.
787 Flight Crew Operations Manual
Air Systems -
Air Conditioning System
Description
2.20.8 Boeing Proprietary
The aft system uses internal fans and valves to direct air drawn from the cabin to
the aft equipment bay and ventilates the warm exhaust air into the aft overboard
valve or aft cargo compartment. 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 aft system reconfigures automatically to an override mode when:
• the AFT 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 aft equipment cooling system or aft equipment
ventilation system, or
• the AFT CARGO FIRE ARM switch is ARMED
In the override mode when the AFT CARGO FIRE ARM switch is not ARMED,
the vent valve opens, both supply fans are inoperative, and the aft cargo heat valve
is closed.
In the override mode when the AFT CARGO FIRE ARM switch is ARMED, the
vent valve remains closed, both supply fans are inoperative, and the aft cargo heat
valve is closed.
In flight, the AFT EQUIP COOLING switch in OVRD aids smoke evacuation
from the passenger cabin.
On the ground, the EICAS advisory message EQUIP COOLING AFT is displayed
and the ground crew call horn in the wheel well sounds if the aft equipment
cooling system is inoperative.
The lavatory/galley ventilation system provides ventilating air for the lavatories
and galleys and smoke control for lavatories and optional crew rests. The system
is also a secondary heat sink for the power electronics cooling system (PECS)
Power Electronics Cooling System
The Power Electronics Cooling System (PECS) provides liquid cooling to the
high voltage direct current equipment in the aft E & E equipment compartment. It
also provides liquid cooling to the supplemental cooling units and associated
motor controllers of the Integrated Cooling System. The system consists of two
independent liquid cooling loops. Each loop has a single pump package which
contains two fully redundant pumps.
Liquid quantities and status for each PECS (Liquid Cooling) loop are displayed
on the STATUS page. PECS controls the liquid coolant supply temperature of each
loop to 85 degrees F during normal operation.
There is no flight deck control for the PECS system. The PECS operation is
completely automated and no crew action is required for either normal or
non-normal modes of operation.
787 Flight Crew Operations Manual
Air Systems -
Air Conditioning System
Description
Boeing Proprietary 2.20.9
Integrated Cooling System
The Integrated Cooling System (ICS) is a centralized refrigeration system that
provides cooling to galley carts and assists with cooling recirculated cabin air. ICS
is integrated with the air conditioning system and PECS to manage airplane heat
loads. There is no flight deck control for the ICS.
Miscellaneous Equipment Cooling System
The miscellaneous equipment cooling system provides cooling to equipment
located in various areas of the airplane. This includes IFE equipment as well as
other non-essential equipment located in the crown and areas of the lower lobe not
cooled by other equipment cooling systems. Operation is fully automatic and
powered on whenever the airplane is powered. Miscellaneous cooling system
power can be removed using the IFE switch on flight deck overhead panel.
787 Flight Crew Operations Manual
Air Systems -
Air Conditioning System
Description
2.20.10 Boeing Proprietary
Intentionally
Blank
787 Flight Crew Operations Manual
Air Systems Chapter 2
Pressurization System Description Section 30
Boeing Proprietary 2.30.1
2.30 Air Systems-Pressurization System Description Introduction
Cabin pressurization is controlled by regulating the discharge of conditioned cabin
air through the outflow valves.
Two outflow valves are installed: one forward and one aft. Normally, most of the
outflow is through the aft outflow valve. This improves ventilation and smoke
removal. Cabin altitude and full ventilation rates can be maintained by either
　
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