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center connection of the forward and aft ducts. The aft duct has
a flange connection to a web on the outboard side of the heat
exchangers. An inspection door is in the aft inlet duct at the aft
end. The ram air exhaust ducts attach to the aft end of the
primary pack air plenum. They attach to the airplane structure
at their aft end with a flex duct and band clamps.
Training Information Point
There is a heat exchanger inlet inspection/clean-out panel in
the inlet ducts. This permits access to the primary and
secondary heat exchanger inlets. The access panel is in the
lower area of the duct, adjacent and outboard of the heat
exchangers. You get access to the ram air inlet duct through the
fairing panels. They are outboard of the air conditioning doors.
A special tool lets you clean the heat exchangers when they are
dirty.
You can repair the ducts if they have cracks or leaks.
AIR CONDITIONING - COOLING - RAM AIR DUCTS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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AIR CONDITIONING - COOLING - RAM AIR DUCTS
AIR CONDITIONING - COOLING - RAM AIR DUCTS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-810
Purpose
The ram air actuator moves the ram air inlet deflector door and
the ram air inlet modulation panel.
Location
The ram air actuator is in the wing-to-body fairing forward of the
air conditioning compartments. The actuator attaches to the
ram air inlet support assembly. You get access to the actuator
from the bottom of the fuselage, through an access panel. There
is a ram air actuator for the left and the right ram air systems.
Physical Description
The ram air actuator is a 115v ac motor-operated linear
actuator. It has these parts:
* Motor
* Limit switches
* Jackscrew
* Electrical connection.
Interfaces
The ram air actuator receives signals from the air conditioning
accessory unit (ACAU) and the pack/zone temperature
controller. The ACAU interface signals come from the air
ground sensing system and the flap control unit. The ACAU
logic controls the actuator when the airplane is on the ground
and in-flight when the flaps are not up. In flight with the flaps up,
the actuator receives control signals from the pack/zone
temperature controller.
Functional Description
The control signals for the actuator go through the internal limit
switches. The internal limit switches sequence the order of
control signals to the motor. The motor turns a linear jackscrew.
The jackscrew moves the ram air inlet modulation panel and
deflector door through mechanical linkages.
AIR CONDITIONING - COOLING - RAM AIR ACTUATOR
EFFECTIVITY
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21-50-00-816
AIR CONDITIONING - COOLING - RAM AIR ACTUATOR
AIR CONDITIONING - COOLING - RAM AIR ACTUATOR
EFFECTIVITY
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AIR CONDITIONING - COOLING - RAM AIR ACTUATOR
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The ram air inlet assembly controls airflow into the ram air
system for heat exchanger cooling.
Location
The ram air inlet assembly is in the wing-to-body fairing forward
of the air conditioning compartments.
Physical Description
The ram air inlet assembly has these two major assemblies:
* Ram air inlet modulation panel
* Ram air inlet deflector door.
GUN 018; GUN 001-012, 201-999 PRE SB 737-21-1148
Ram Air Inlet Modulation Panel
The ram air inlet modulation panel is made of two panel
sections. The two panels are hinged together. The forward
panel has a hinge at the forward end that connects to the
airplane structure. The aft panel has rollers in tracks at the aft
end. On the aft panel, clevis fittings on the mid section and the
　
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