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757 MAINTENANCE MANUAL
 PRESSURIZATION CONTROL SYSTEM - ADJUSTMENT/TEST
_______________________________________________
 1.  General_______
 A.  This procedure has an operational test and a system test of the cabin pressurization system and a BITE test. The operational test does a complete check of the cabin altitude failure indication system.
 TASK 21-31-00-745-048
 2.  Pressurization Control Bite Test________________________________
 A.  References
 (1)  
AMM 06-46-00/201, Entry, Service, and Cargo Doors (Major Zone 800) Access Doors and Panels

 (2)  
AMM 24-22-00/201, Electrical Power Control

 B.  
Prepare for Test

 S 865-067
 (1)  
Make sure that these circuit breakers, on the overhead circuit breaker panel, P11, are closed:

 (a)  
11B14, CABIN ALTITUDE CONTROL MANUAL

 (b)  
11B15, CABIN ALTITUDE CONTROL SELECT

 (c)  
11N15, CABIN ALTITUDE CONTROL AUTO 1

 (d)  
11N24, CABIN ALTITUDE CONTROL AUTO 2

 (e)  
11S15, AIR/GND SYS 1

 (f)  
11S19, AIR/GND SYS 2

 S 015-049
 (2)
Open the forward (No. 1) cargo door, 821 (AMM 06-46-00/201).

 S 215-050

 (3)  
Find the auto-1 and auto-2 cabin-pressure controllers in the E5 rack.

 S 865-051

 (4)  
Supply the electrical power (AMM 24-22-00/201).

 C.  
Procedure

 NOTE:____This test can only be done on one controller at a time. Do the test for the AUTO 1 controller, then do the test for the AUTO 2 controller. The instructions in parentheses are for the AUTO 2 controller test.
 S 865-053
 (1)  Turn the MODE SELECT selector, on the overhead panel, P5, to the AUTO 1 (AUTO 2) position.
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757 
MAINTENANCE MANUAL 
P5 PANEL 
SEE  A  P11 PANEL 

E5 RACK SEE B
FLIGHT DECK
CABIN PRESSURE SELECTOR
CABIN ALTITUDE CONTROL
CABIN PRESSURE
VALVE CLIMB MANUAL AUTO RATE
PRESS
OP MIN MAX
CL DESCEND
TEST
LDG ALT BITE INSTRUCTIONSAUTO INOP
02970
MODE SELECT
AUTO 2 AUTO 1 MAN
MODE SELECTOR
COMPONENT  STATUS 
CABIN  CONTROLLER  NO FAULT 
AC MOTOR  AC POWER OFF 
AND INDICATING PRESSURIZATION  10 8 6 4 2 0  25 20 15 108 6 4 0 2  0 1 2 1 2  LDG GEAR SW SELECTOR  VERIFY MODE LOW INFLOW 
WARNING MODULE  PSIDIFF  1000 FT X ALT  1000 FPM X RATE 
EQUIP COOLING  RCABIN 
ALTITUDE 
ASMOKE  OVHTA ALTN  TO/LDG LIMIT: PRESS DIFF  BIT  VERIFY  RESET 
.125 PSI 

AUTOMATIC PRESSURE
OVERHEAD PANELCONTROLLER INSTALLATION A B
Pressurization System Test Components Figure 501 (Sheet 1)
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757
MAINTENANCE MANUAL

SEE C
OUTFLOW
VALVE

INNER SKIN (REF)
INBD FWD
C
Pressurization System Test Components
Figure 501 (Sheet 2)

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757
MAINTENANCE MANUAL
　
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