21-31-00
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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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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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