Zone Temperature Control System - Component Location
Figure 1 (Sheet 3)

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D10135
A

747-400
MAINTENANCE MANUAL

UPPER DECK TEMPERATURE SENSOR G
TEMPERATURE
SENSOR ASSEMBLY

MAIN DECK TEMPERATURE SENSOR H
TEMPERATURE
CONTROL SWITCH
(EXAMPLE)

LOWER CARGO TEMPERATURE SENSOR
I
Zone Temperature Control System - Component Location Figure 1 (Sheet 4)
 D10145
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747-400
MAINTENANCE MANUAL

AFT CARGO ZONE DUCT TEMPERATURE SENSOR AND OVERTEMPERATURE SWITCH
SEE M
FORWARD CARGO AREA AFT OF
TRIM AIR CREW REST AREA
SHUTOFF VALVE
SEE K SEE Q
FORWARD CARGO TRIMCREW AIR MODULATION VALVE
REST AREA
SEE P

FORWARD CARGO CONDITIONED AIR SUPPLY
SEE J
FORWARD CARGO CONDITIONED AIR SUPPLY DUCT
FORWARD CARGO ZONE DUCT PACK 3 TEMPERATURE SENSOR AND WATER SEPERATOR OVERTEMPERATURE SWITCH (REF)
UPPER
SEE N
DECK
FORWARD CARGO CONDITIONED AIR SUPPLY (IN RIGHT AIR CONDITIONING EQUIPMENT BAY)
UPPER DECK TRIM AIR  J
MODULATION VALVE
SEE P
CREW REST AREA TRIM AIR MODULATION VALVE
SEE P
FLIGHT DECK TRIM AIR MODULATION VALVE
SEE P
FWD INBD
AREA AFT OF CREW REST AREA
K

Zone Temperature Control System - Component Location
Figure 1 (Sheet 5)

D10154
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747-400 MAINTENANCE MANUAL
FORWARD MAIN DECK ZONE DUCT
UPPER DECK ZONE DUCT TEMPERATURE SENSOR AND
TEMPERATURE SENSOR ANDOVERTEMPERATURE SWITCH
OVERTEMPERATURE SWITCH SEE L
CREW REST AREA ZONE DUCTSEE L TEMPERATURE SENSOR AND
OVERTEMPERATURE SWITCH
SEE L
AFT MAIN DECK ZONE DUCT TEMPERATURE SENSOR AND OVERTEMPERATURE SWITCH
SEE L FLIGHT DECK ZONE DUCT TEMPERATURE SENSOR AND OVERTEMPERATURE SWITCH
SEE L
ZONE DUCT
TEMPERATURE
SENSOR
ZONE DUCT OVERTEMPERATURE SWITCH
ZONE DUCT TEMPERATURE SENSOR AND OVERTEMPERATURE SWITCH
L
AFT CARGO ZONE DUCT TEMPERATURE SENSOR
AFT CARGO  FORWARD CARGO 
ZONE DUCT  DUCT OVERTEMPERATURE 
OVERTEMPERATURE  SWITCH 
SWITCH  FORWARD CARGO DUCT 
TEMPERATURE SENSOR 
AFT CARGO ZONE DUCT TEMPERATURE  FORWARD CARGO ZONE DUCT TEMPERATURE 
SENSOR AND OVERTEMPERATURE SWITCH  SENSOR AND OVERTEMPERATURE SWITCH 
M  N 

Zone Temperature Control System - Component Location
Figure 1 (Sheet 6)

D10156
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747-400
MAINTENANCE MANUAL

MAIN DECK AFT TRIM AIR MODULATION VALVE
SEE P LEFT WHEEL
MAIN DECK AFT TRIM AIR WELL
MODULATION VALVE
SEE P
TRIM AIR PRESSURE SENSOR
SEE S  MAIN DECK FORWARD TRIM AIR MODULATION VALVE
SEE P
　
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