* SEE WDM EQUIPMENT LIST
Pressurization Control - Component Index
Figure 101 (Sheet 2)
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A
747-400 FAULT ISOLATION/MAINT MANUAL
CABIN PRESSURE SELECTOR
PANEL, M181 P5 PANEL
SEE B P6 PANEL
CABIN PRESSURE CONTROLLER, A,B, M7948,M7949
E2-3
P414
E1-3 CABIN PRESSURE
CABIN PRESSURE CONTROLLER B, M7949
CONTROLLER A, M7948
SEE A
CABIN
SEE A
SENSE
MAIN EQUIP CTR PORT
CABIN PRESSURE CONTROLLER A,B,M7948,M7949
A
CABIN ALTITUDELDG ALT OP
OP
PUSH ON
CONTROL
OUTFLOW -VALVES-
AUTO SELECT
CL CL
MAX ~P
NORM
.11 PSI
MAN L MAN R
A
OPEN
T/D & LDG ONON
Bw w
w CLOSE w
CABIN PRESSURE SELECTOR MODULE, M181
B
Pressurization Control - Component LocationFigure 102 (Sheet 1)
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A
747-400
FAULT ISOLATION/MAINT MANUAL
LEFT OUTFLOW VALVE
V90 SHOWN (RIGHT
OUTFLOW VALVE OUTFLOW VALVE
V91 OPPOSITE) SCREEN
OUTFLOW VALVE
SEE C DC MOTOR
OUTFLOW VALVE
AC MOTOR
ACTUATOR
GEAR CASE
ACCESS OUTFLOW VALVE PANEL POSITION POTENTIOMETER
BULK CARGO LEFT ICU M7950COMPARTMENT SHOWN (RIGHT ICUAFT BULKHEAD M7951 OPPOSITE)
(REF) SEE D FWDOUTFLOW VALVE, V90,V91
LEFT OUTFLOW VALVE, V90 SHOWN (RIGHT OUTFLOW VALVE, V91 OPPOSITE)
C
BULK CARGO COMPARTMENT AFT BULKHEAD (REF)
INTERFACE CONTROL UNIT (ICU), M7950,M7951
ELECTRICAL PANEL, P212,P213FWD
LEFT ICU M7950 SHOWN (RIGHT ICU M7951 OPPOSITE)
D
Pressurization Control - Component Location Figure 102 (Sheet 2)
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A
747-400 FAULT ISOLATION/MAINT MANUAL
UPPER, LOWER CABIN PRESSURE RELIEF VALVES
SEE E
FORWARD CARGO COMPARTMENT (REF)
UPPER PRESSURE
RELIEF VALVE
FILTER
UPPER CABIN PRESSURE INTEGRAL AMBIENTRELIEF SWITCH, S667 SENSING LINE
FILTER
REMOTE AMBIENT
SENSING LINE
LOWER PRESSURE
RELIEF VALVE FWD
LOWER CABIN PRESSURE
RELIEF SWITCH, S668
UPPER, LOWER CABIN PRESSURE RELIEF VALVES
E
Pressurization Control - Component Location Figure 102 (Sheet 3)
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