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SWITCH - MANUAL TOGGLE, (S2)  1  1  M181FLT COMPT, P5, CAB PRESS PNL,  *
SWITCH - UPR CABIN PRESS RELIEF, S667 3  1  FWD CARGO COMPT, AFT HALF, LH  *
SWITCH - LWR CABIN PRESS RELIEF, S668  3  1  FWD CARGO COMPT, AFT HALF, LH  *
SWITCH/LIGHT - LEFT MANUAL, (S4)  1  1  FLT COMPT, P5, CAB PRESS MODULE, M181  *
 R EIU, M7351 L EIU, M7442 C EIU, M7443 UNIT - (REF 31-61-00, FIG. 101)SWITCH/LIGHT - RIGHT MANUAL, (S3)  1  1 FLT COMPT, P5, CAB PRESS MODULE, M181  *
VALVE - R PRESSURIZATION OUTFLOW, V90  2  1  AFT OF BULK CARGO COMPT, RH  21-31-01 
VALVE - L PRESSURIZATION OUTFLOW, V91  2  1  AFT OF BULK CARGO COMPT, LH  21-31-01
VALVES - POSITIVE PRESSURE RELIEF  3  2  FWD CARGO COMPT, LH 21-32-01 

* SEE WDM EQUIPMENT LIST
Pressurization Control - Component Index
Figure 101 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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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