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Ram Air Inlet Modulation Panel
The ram air inlet modulation panel has 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 upper surface, connect
link arms to the shaft assembly.
GUN 105-118; GUN 101-104 POST SB 737-21-1148
Ram Air Inlet Modulation Panel
The ram air inlet modulation panel has 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 101-118
Functional Description
The ram air inlet modulation panel and shaft assembly adjusts
the quantity of air that goes into the ram air system. The ram air
inlet actuator supplies the movement functions.
The ram air inlet 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.
Ram Air Inlet Deflector Door
The ram air inlet deflector door makes sure ice, rocks, and
other unwanted material do not go into the ram air inlet.
AIR CONDITIONING - COOLING - RAM AIR INLET DOOR ASSEMBLY
EFFECTIVITY
GUN 101-118 21-50-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-026
The shaft assembly moves the deflector door.
Location
The ram air inlet deflector door and shaft assembly are in the
wing-to-body fairing forward of the air conditioning
compartments. The deflector door is in the forward area of
the ram air inlet assembly. You get access to the deflector door
from the ram air inlet.
Physical Description
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.
Functional Description
The ram air inlet actuator transmits motion through tie-rods and
link arms to the shaft assembly. The shaft assembly transmits
motion to the deflector door.
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.
AIR CONDITIONING - COOLING - RAM AIR INLET DOOR ASSEMBLY
EFFECTIVITY
GUN 101-118 21-50-00
Page 26
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-026
AIR CONDITIONING - COOLING - RAM AIR INLET DOOR ASSEMBLY
AIR CONDITIONING - COOLING - RAM AIR INLET DOOR ASSEMBLY
EFFECTIVITY
GUN 101-104 PRE SB 737-21-1148 21-50-00
Page 27
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-026
AIR CONDITIONING - COOLING - RAM AIR INLET DOOR ASSEMBLY
AIR CONDITIONING - COOLING - RAM AIR INLET DOOR ASSEMBLY
EFFECTIVITY
GUN 105-118; GUN 101-104 POST SB 737-21-1148 21-50-00
Page 28
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-026
THIS PAGE IS INTENTIONALLY LEFT BLANK
AIR CONDITIONING - COOLING - RAM AIR INLET DOOR ASSEMBLY
21-50-00
Page 29
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 control temperature sensor supplies temperature
data to the ram air 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.
The ram air inlet controller is in the air conditioning
compartment next to the water separator.
Physical Description
The ram air sensor has a stainless steel probe housing. The
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