737 Flight Crew Operations Manual
Air Systems -
Pressurization System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
2.40.2 D6-27370-866-EGP
Cabin Pressure Control System Schematic
Pressurization Outflow
Cabin air outflow is controlled by the outflow valve and the overboard exhaust
valve. A small amount is also exhausted through toilet and galley vents,
miscellaneous fixed vents, and by seal leakage.
STATIC PORT STATIC PORT
ADIRU
ADIRU
NEGATIVE
PRESSURE
RELIEF
E
S
O
C
N
E
P
O
E
V
L
A
V
L
MANUAL
CABIN
SENSE
PORT
CABIN
SENSE
PORT
SENSORS
DC
DC
DC
MAN
AUTO
ALTN
CONTROLLER
AUTO
CONTROLLER
AUTO
OUTFLOW
SAFETY
VALVE
PRESSURE RELIEF
AIR/GROUND
CONDITION:
IN FLIGHT
NORMAL OPERATION
AUTO
FAIL
OFF SCHED
DESCENT
ALTN
IN HPA
BARO
STD
IN HPA
BARO
STD
MAXIMUM 9.1 PSI
MANUAL
STALL
MANAGEMENT
COMPUTER
STALL
MANAGEMENT
COMPUTER
FLT ALT
LAND ALT
AUTO
September 28, 2006
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