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A

747-400 FAULT ISOLATION/MAINT MANUAL
PACK 2 TURBINE BYPASS VALVE, V103
PACK 1 RAM AIR EXIT DOOR ACTUATOR, V156 SEE U SHT 9
PACK 2 RAM AIR EXIT SEE R SHT 9
DOOR LIMIT SWITCH, S573 PACK 1 RAM AIR EXIT SEE T SHT 9
DOOR LIMIT SWITCH, S572
SEE T SHT 9
PACK 2 RAM AIR EXIT DOOR ACTUATOR, V157
SEE R SHT 9
PACK 2 RAM AIR INLET DOOR ACTUATOR, V106 PACK 2 HEAT
SEE S SHT 9 EXCHANGER (REF)
SEE Q
PACK 3 RAM AIR EXIT DOOR ACTUATOR, V158
PACK 3 TURBINE BYPASS VALVE, V104
FWD  SEE R SHT 9
SEE U SHT 9
INLET DOOR PACK 3 RAM AIR PACK 1 RAM AIR
PACK 3 RAM AIR INLET DOOR ACTUATOR, V107
ACTUATOR, V105 EXIT DOOR LIMIT SWITCH, SEE S SHT 9 S574

SEE  T  SHT 9 
PACK 1 TURBINE  SEE  S  SHT 9 
BYPASS VALVE, 
V102  TRIM AIR PRESSURE 
SENSOR, T1616 
SEE  U  SHT 9  AIR CONDITIONING  (PACK 2 ONLY) 
EQUIPMENT BAY 

PACK 2 HEAT EXCHANGER (EXAMPLE)
Q
Temperature Control System - Component Location Figure 102 (Sheet 8)
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747-400 FAULT ISOLATION/MAINT MANUAL
RAM AIR EXIT DOOR ACTUATOR,RAM AIR V156, V157, V158EXIT DOOR LINKAGE (REF)
R

RAM AIR INLET 
DOOR ACTUATOR, 
V105, V106, V107 
S 
RAM AIR EXIT  RAM AIR 
DOOR LINKAGE  INLET DOOR 
(REF)  (REF) 

RAM AIR EXIT DOOR 
LIMIT SWITCH, 
S572, S573, S574  TURBINE 
BYPASS VALVE 
V102, V103, 
V104 
FWD 
T  U 

Temperature Control System - Component Location (Details From Sht 8)
Figure 102 (Sheet 9)

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747-400
FAULT ISOLATION/MAINT MANUAL

PACK 1 DISCHARGE
TEMPERATURE
SENSORS, T1609,

PACK 2 DISCHARGE
T1612
TEMPERATURE SEE V SENSORS, T1610, T1613
SEE V
PACK 3 DISCHARGE TEMPERATURE SENSORS, T1611, T1614
SEE W
FWD
AIR CONDITIONING EQUIPMENT BAY
PACK DISCHARGE PACK DISCHARGE
TEMPERATURE SENSOR A, OVERHEAT SWITCH
T1611 (REF)
PACK DISCHARGE TEMPERATURE SENSOR B, T1612, T1613
PACK
FWD DISCHARGE TEMPERATURE SENSOR B, T1614
PACK PACK DISCHARGE
DISCHARGE TEMPERATURE SENSOR A,
OVERHEAT T1609, T1610
SWITCH (REF)
A/C PACKS NO. 1 AND 2  A/C PACK NO. 3
V W
AFT
Temperature Control System - Component Location
Figure 102 (Sheet 10)

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747-400 MAINTENANCE MANUAL
 ZONE TEMPERATURE CONTROL SYSTEM - DESCRIPTION AND OPERATION
___________________________________________________________
 1.  General (Fig. 1)_______
 A.  The zone temperature control system regulates the temperature of the air distributed to the airplane cabin. For temperature control purposes, the airplane cabin is divided into zones by the conditioned air distribution system. The temperature of each zone may be adjusted independently. For each zone, a variable amount of hot bleed air (trim air) is mixed with cooled air supplied from the air conditioning packs to achieve the selected temperature.
 B.  There are seven temperature zones in the airplane for the areas that follow:
　
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