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duct is made of fiberglass reinforced polymer, the aft duct is
made of kevlar. The forward section of the inlet ducts attach to
the airplane structure at the forward part of the ram air inlet.
They attach to the aft section with a flex duct and band clamps.
There are tie-rods that attach the ducts to the structure at the
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
GUN 101-118 21-50-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-024
AIR CONDITIONING - COOLING - RAM AIR DUCTS
AIR CONDITIONING - COOLING - RAM AIR DUCTS
EFFECTIVITY
GUN 101-118 21-50-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-024
Purpose
The ram air inlet actuator moves the ram air inlet deflector door
and the ram air inlet modulation panel.
Location
The ram air inlet 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 inlet actuator for the left and the right
ram air systems.
Physical Description
The ram air inlet actuator is a 115v ac motor-operated linear
actuator. It has these parts:
* Motor
* Limit switches
* Jackscrew
* Electrical connection.
Interfaces
The ram air inlet actuator receives signals from the air
conditioning accessory unit (ACAU) and the ram air inlet
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 ram air 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 INLET ACTUATOR
EFFECTIVITY
GUN 101-118 21-50-00
Page 22
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-025
AIR CONDITIONING - COOLING - RAM AIR INLET ACTUATOR
AIR CONDITIONING - COOLING - RAM AIR INLET ACTUATOR
EFFECTIVITY
GUN 101-118 21-50-00
Page 23
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-025
THIS PAGE IS INTENTIONALLY LEFT BLANK
AIR CONDITIONING - COOLING - RAM AIR INLET ACTUATOR
21-50-00
Page 24
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The ram air inlet assembly controls air flow 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. The modulation panel is
in the inlet of the ram air inlet duct.
The ram air inlet assembly has these two major assemblies:
* Ram air inlet modulation panel
* Ram air inlet deflector door.
GUN 101-104 PRE SB 737-21-1148
　
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