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upper surface connect link arms to the shaft assembly.
GUN 013-017, 019-099; GUN 001-012, 201-999 POST 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 slide blocks in tracks at the
aft end. On the aft panel, clevis fittings on the mid section and
the upper surface connect link arms to the shaft assembly.
GUN 001-099, 201-999
Ram Air Inlet Deflector Door
The ram air inlet deflector door is a flat surface that is springloaded
closed. The shaft assembly is a torque tube with two tierods
and a preloaded spring. The tie-rods connect to clevis
fittings on the deflector door.
The ram air inlet deflector door makes sure ice, rocks, and
other unwanted material do not go into the ram air inlet.
The shaft assembly moves the deflector door.
AIR CONDITIONING - COOLING - RAM AIR INLET DOOR ASSEMBLY
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 95
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-817
Functional Description
The ram air actuator moves the modulation panel. Linear
movement of the actuator arm transmits movement through a
link arm to the modulation panel shaft assembly. The shaft turns
link arms that lift or lower the two panels. The aft panel has
rollers that let it move forward or aft as the two panels move up
or down. The modulation panel and the ram air inlet deflector
door are mechanically connected.
The ram air inlet deflector door has two positions. When the
airplane is on the ground, the door extends to give protection to
the ram air inlet. When the airplane is in the air, the deflector
door retracts.
The ram air actuator transmits motion through tie-rods and link
arms to the shaft assembly. The shaft assembly transmits
motion to the deflector door.
AIR CONDITIONING - COOLING - RAM AIR INLET DOOR ASSEMBLY
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 96
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-817
AIR CONDITIONING - COOLING - RAM AIR INLET DOOR ASSEMBLY
AIR CONDITIONING - COOLING - RAM AIR INLET DOOR ASSEMBLY
EFFECTIVITY
GUN 018; GUN 001-012, 201-999 PRE SB 737-21-1148 21-50-00
Page 97
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-817
AIR CONDITIONING - COOLING - RAM AIR INLET DOOR ASSEMBLY
AIR CONDITIONING - COOLING - RAM AIR INLET DOOR ASSEMBLY
EFFECTIVITY
GUN 013-017, 019-099; GUN 001-012, 201-999 POST SB 737-21-1148 21-50-00
Page 98
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-817
THIS PAGE IS INTENTIONALLY LEFT BLANK
AIR CONDITIONING - COOLING - RAM AIR INLET DOOR ASSEMBLY
21-50-00
Page 98.1
D633A101-GUN Jun 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The ram air sensor supplies temperature data to the pack/zone
temperature controller.
Location
The ram air sensor is in the air conditioning compartment. It is
in the duct that connects the compressor section of the ACM to
the secondary heat exchanger.
There is a ram air sensor for each pack ram air system.
Physical Description
The ram air sensor has a stainless steel probe housing. The
probe housing attaches to the electrical connector and is
hermetically sealed.
Functional Description
The ram air sensor is a thermistor bead element. The
resistance of the temperature sensing element changes as
the air temperature changes.
The pack/zone temperature controller uses the resistance of the
temperature sensor in a control bridge. When the temperature
is more or less than 230F (110C), the controller changes the
position of the ram air inlet modulation panel.
AIR CONDITIONING - COOLING - RAM AIR TEMPERATURE SENSOR
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.2
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
　
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