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A

757
FAULT ISOLATION/MAINT MANUAL

POSITIVE PRESSURE RELIEF VALVES
SEE A
VACUUM PRESSURE 
POSITIVE  RELIEF VALVES 
PRESSURE 
RELIEF  SEE  B 
VALVES 

AIRPLANE OUTER SKIN (REF)
REMOTE AMBIENTFWD SENSING TUBE
POSITIVE PRESSURE RELIEF VALVES
A

RIGHT SIDEWALL (REF)
VALVE DOOR FWD
VACUUM PRESSURE RELIEF VALVES B
Pressurization - Component Location
Figure 102 (Sheet 1)

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757
FAULT ISOLATION/MAINT MANUAL

CABIN PRESSURE SELECTOR, M13; PRESSURIZATION AND INDICATING WARNING MODULE, M19 P11 PANEL
SEE D DISCRETE WARNING DISPLAY PANEL, M779
SEE C
FLIGHT COMPARTMENT
CABIN ALTITUDE CONTROL VALVE CLIMB MANUAL
AUTO RATE OP
MIN MAX
CL DESCEND
LDG ALT
AUTO INOP 02970 MODE SELECT
AUTO 2 AUTO 1 MAN
PULL TO SET
1
BELOW SL
CABIN 
0 68 10  2 4  0 2 4 610 8 15 20 25  1 2 6 61 2 0 

FPM X
FT X 1000DIFF PSI ALT 1000 RATE
EQUIP COOLING
CABIN
ALTITUDE

ALTNSMOKE PRESS DIFF LIMIT:OVHT TO/LDG .125 PSI
CABIN PRESSURE SELECTOR, M13;
PRESSURIZATION AND INDICATING
WARNING MODULE, M19

D
1
NOT ON ALL AIRPLANES P5 PANEL
CONFIGFIRE A/PPULL UP
DISC CABIN
OVSPD
ALT
DISCRETE WARNING DISPLAY PANEL, M779
C
CABIN PRESSURE
SELECTOR, M13

PRESSURIZATION AND INDICATING WARNING MODULE, M19
HIGH ALT LDG VIDEO ON ON INOP
HIGH ALTITUDE LANDING SWITCH/ LIGHT, YTLS1
1
HIGH ALTITUDE
WARNING MODULE,
M10756

1
NO. 1 OR NO. 2 CABIN PRESSURE CONTROLLER, M118 OR M119
SEE E E5 RACK
FORWARD CARGO DOOR, 821
MAIN EQUIPMENT
CENTER

CABIN PRESSURE
PRESS
TEST
BITE INSTRUCTIONS
COMPONENT STATUS
CONTROLLER NO FAULT AC MOTOR AC POWER OFF SELECTOR LOW INFLOW
LDG GEAR SW VERIFY MODE
BIT VERIFY RESET
NO. 1 OR NO. 2 CABIN PRESSURE
CONTROLLER, M118 OR M119

E

Pressurization - Component Location
Figure 102 (Sheet 2)

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757
FAULT ISOLATION/MAINT MANUAL

CABIN PRESSURE 
SEE F OUTFLOW VALVE, V15  FORWARD EQUIPMENT CENTER ACCESS PANEL, 113AL  DIFFERENTIAL PRESSURE SENSOR, TS5072 
SEE  G 

AC MOTORS, YBWM2 DC MOTOR
CABIN PRESSURE OUTFLOW VALVE ACTUATOR, YBWM1
SENSOR
AIRPLANE INNER SKIN (REF)
INBD FWD
CABIN PRESSURE OUTFLOW VALVE, V15 DIFFERENTIAL PRESSURE SENSOR, TS5072F G
Pressurization - Component Location Figure 102 (Sheet 3)
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757 MAINTENANCE MANUAL
 PRESSURIZATION CONTROL SYSTEM - DESCRIPTION AND OPERATION
_________________________________________________________
 1.  General (Fig. 1)_______
 A.  The pressurization control system maintains a comfortable and safe cabin pressure, by controlling the rate of airflow from the cabin, in all flight modes. The air conditioning system provides air for pressurization (Ref 21-00-00).
 B.  The system uses two modes of operation, automatic and manual. Positive-pressure-relief valves (Ref 21-32-00) and cargo vent doors (Ref 52-34-00) provide backup protection against overpressurization. Pressure indicators and altitude switches provide cabin pressure indication and warning (Ref 21-33-00).
　
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