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probe housing attaches to the electrical connector and is
hermetically sealed.
The housing has external threads and hexagonal flats for a
boss mount.
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 ram air temperature controller uses the resistance of the
temperature sensor in a control bridge. When the temperature
is above or below 230F (110C), the controller continues to
change the position of the ram air inlet modulation panel. The
controller does not send control signals when the temperature
is approximately 230F (110C)
Training Information Point
Install a new O-ring on the sensor before you install the sensor
in the duct.
CAUTION: USE TWO WRENCHES WHEN YOU REMOVE/
INSTALL THE SWITCH IN/OUT OF THE BOSS.
THIS WILL PREVENT DAMAGE TO THE DUCT.
AIR CONDITIONING - COOLING - RAM AIR INLET CONTROLLER AND TEMPERATURE SENSOR
EFFECTIVITY
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AIR CONDITIONING - COOLING - RAM AIR INLET CONTROLLER AND TEMPERATURE SENSOR
AIR CONDITIONING - COOLING - RAM AIR INLET CONTROLLER AND TEMPERATURE SENSOR
EFFECTIVITY
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AIR CONDITIONING - COOLING - RAM AIR INLET CONTROLLER AND TEMPERATURE SENSOR
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
General
The ram air system controls the air flow through the primary
and secondary heat exchangers. These are the ram air system
components:
* Ram air controller
* Ram air inlet actuator
* Ram air control temperature sensor
* Ram air inlet deflector door
* Ram air inlet modulation panels
* Ram air ducts.
These are the three modes of control for the ram air system:
* Ground
* Flight (flaps not up)
* Flight (flaps up).
The air conditioning accessory unit (ACAU) relays control
power to the ram air controller and the ram air actuator.
There are separate control circuits for the left and right ram air
systems.
Ground Mode
When the airplane is on the ground, the AIR/GND sensing
system supplies a discrete (ground) to energize the K24 left air
ground relay, and the K23 left ram mod control relay.
When K23 relay is energized, 115v ac is supplied to the ram air
actuator. The left ram air actuator has internal switches that
connect power to the motor. The S1 switch supplies power to
the motor until the actuator is in the fully retracted position. This
opens the modulation panels and extends the deflector door.
When the actuator is in the fully retracted position, S1 opens to
remove power to the motor.
The deflector door is in the extended position when the actuator
shaft is between the S1 and S2 switch positions.
The S3 switch in the ram air actuator connects a ground to the
air conditioning/bleed air controls panel. This causes the left
RAM DOOR FULL OPEN light to come on.
Flight (Flaps Not Up)
At takeoff, the AIR/GND sensing system opens to de-energize
K24 left air ground relay. The K23 left ram mod control relay
stays energized with a ground from the trailing edge flaps up
switch when the flaps are not up.
When K24 relay is de-energized, 115v ac power is supplied to
the left ram air actuator. Power to the motor extend coils is
through the S2 switch at takeoff. The deflector door moves out of
the airstream when the actuator is at the S2 switch position.
The left RAM DOOR FULL OPEN light will be on.
AIR CONDITIONING - COOLING - RAM AIR SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-50-00
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Flight (Flaps Up)
In flight, when the flaps are at the full up position, K23 relay deenergizes
and 115v ac is supplied to the left ram air controller.
The ram air controller reads temperature signals from the ram
air control temperature sensor. The sensor sends signals from
the air cycle machine (ACM) compressor outlet. The controller
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