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* Outflow valve position indicator
* Outflow valve switch.
Cabin Altitude Panel
These controls and indications are on the cabin altitude panel:
* Cabin differential pressure indicator
* Cabin rate of climb indicator
* Altitude horn cutout switch.
AIR CONDITIONING - CONTROL PANELS
EFFECTIVITY
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AIR CONDITIONING - CONTROL PANELS
AIR CONDITIONING - CONTROL PANELS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Distribution
The distribution system has these components in the
distribution compartment (aft of the forward cargo
compartment):
* Main distribution manifold
* Recirculation fan
* Ground conditioned air connection.
The equipment cooling system has components in these areas:
* EE compartment
* Forward equipment compartment
* Forward cargo compartment (E-9)
* Flight compartment.
Cooling System
The two air conditioning packs are in the air conditioning
compartments. The air conditioning compartments are on the
left and right sides of the keel beam in the wing-to-body area.
Access is from the bottom of the fuselage.
Temperature Control
The temperature control system has components in these
areas:
* Passenger distribution ducting
* EE compartment
* Flight compartment.
Pressurization
The pressurization system has components in these areas:
* Flight compartment
* EE compartment
* Aft cargo compartment.
AIR CONDITIONING - COMPONENT LOCATION
EFFECTIVITY
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AIR CONDITIONING - COMPONENT LOCATION
AIR CONDITIONING - COMPONENT LOCATION
EFFECTIVITY
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AIR CONDITIONING - COMPONENT LOCATION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
These are the primary parts of the air conditioning (A/C) system
that have an effect on the supply of fresh air or the recirculation
of conditioned air:
* Pack flow control
* Pack cooling system
* Zone temperature control
* Recirculation
* Air distribution.
The primary parts of the A/C system have these functions:
* Control fresh air flow for airplane pressurization and
ventilation
* Control the flight compartment and passenger cabin
temperature
* Recirculate cabin air for ventilation.
Pack Flow Control
This part of the A/C system controls the quantity of fresh air that
goes into the airplane. The control is by a flow control and
shutoff valve.
The quantity of fresh air necessary for ventilation is more than
for pressurization. The ventilation quantity is based on a fixed
value for the crew and allowable leakage, and on the number of
passenger seats.
Usually, the left and right flow control systems provide the same
quantity of fresh air. Fresh air flow changes when airplane
conditions change.
See the pack flow control section for more information about the
pack flow control systems. (SECTION 21-50)
Pack Cooling System
This part of the A/C system removes water as necessary and
controls the temperature of the fresh air before it goes into the
air distribution part of the air conditioning system. The primary
components are the left and right packs.
The usual control for the left pack makes sure that it supplies air
at a temperature that gives the necessary cooling for the flight
compartment.
The control for the right pack makes sure that it supplies air at a
temperature that gives the necessary cooling for the passenger
compartment.
See the pack flow control and pack cooling system section for
more information about the pack flow control and pack cooling
systems. (SECTION 21-50)
AIR CONDITIONING - FUNCTIONAL DESCRIPTION
　
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