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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A 
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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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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