*
Pack cooling and mix manifold temperature control (SECTION 21-52)
*
Trim air pressure regulation and shutoff control (SECTION 21-62).
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AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -CTC -INTERFACES 2
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AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -ZONE TRIM AIR MODULATING VALVES AND MUFFLERS
Purpose
The zone trim air modulating valves control the flow of air from the pneumatic system to each zone. The mufflers reduce the noise in the flight deck and passenger cabin caused by the flow of trim air.
Location
The valves and the mufflers are in the forward part of the left and right ECS bays. There is one valve and one muffler for each temperature control zone.
You get access to the mufflers and the valves through the left and right ground conditioned air panels and the ECS bay doors.
Physical Description
Each valve has these parts:
*
Electrical actuator
*
Valve body
*
Manual open/shut knob
*
Electrical connector.
All of the trim air modulating valves are the same. Each has an internal disc in the valve body. The electrical actuator has these internal parts:
*
Motor
*
RVDT and position indicator
*
Gears.
The motor controls disc position. The RVDT gives an electrical indication of the disc position and a visual indication of disc position.
Functional Description
A close or open signal from the CTC operates the actuator motor in the necessary direction.
The RVDT gives valve position to the CTC.
Training Information Point
Manually open or shut the valve with the manual open/shut knob. You must disconnect the electrical connector first. If you do not remove the electrical connector the valve will move to the commanded position when the valve gets power.
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AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -ZONE TRIM AIR MODULATING VALVES AND MUFFLERS
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AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -FLIGHT DECK ZONE DUCT TEMP SENSORS
Purpose
The flight deck zone duct temperature sensors monitor air temperature within the air distribution duct.
Physical Description
The sensors are solid state electronic devices.
Location
The flight deck zone duct temperature sensor is along the duct that supplies conditioned air to the flight deck.
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AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -FLIGHT DECK ZONE DUCT TEMP SENSORS
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AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -CABIN ZONE DUCT TEMP SENSORS
Purpose
The cabin zone duct temperature sensors monitor air temperature within the air distribution ducts.
Physical Description
The sensors are solid state electronic devices.
Location
The cabin zone duct temperature sensors are in the ducts that supply conditioned air to the cabin zones. The sensors for zones A, B, C, and D are at the top of the related risers. The sensors for zones E and F are at the top of the distribution duct.
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AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -CABIN ZONE DUCT TEMP SENSORS
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D633W101-BEJ Jan 05/2002
AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -FLIGHT DECK ZONE AIR TEMP SENSORS
Purpose
The cabin temperature controllers (CTCs) use the flight deck zone temperature sensors to monitor the flight deck temperature.
Physical Description
The sensors are dual element thermistors. Each sensor has a threaded housing with an electrical connection.
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