B.
Access
(1)
Location Zones
211/212 Control Cabin - Section 41
C.
Procedure
S 864-002
(1)
Supply electrical power (Ref 24-22-00).
S 864-003
(2)
Open these circuit breakers on the overhead panel, P11, and attach DO-NOT-CLOSE tags:
(a)
11B12, CABIN DIFF PRESS IND
(b)
11B13, CABIN ALTM
S 034-004
(3)
Loosen the 1/4-turn fasteners from the warning module.
S 024-006
(4)
Remove the warning module from the panel.
(5)
Disconnect the two electrical connectors from the warning module.
(6)
Put a plug on the cabin pressure port to keep out unwanted objects.
S 034-005
S 434-007
TASK 21-33-01-404-008
3. Install the Pressurization and Indication Warning Module
________________________________________________________
A. References
(1) 24-22-00/201, Electrical Power Control
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21-33-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
PRESSURIZATION AND INDICATION WARNING MODULE
SEE A
P5
PANEL
FLIGHT DECK
PRESSURIZATION
INDICATING CABIN
PANEL
10 0 2 25 20 0 4 2 0 1 2 6
8 6 4 15 10 8 6 1 2 6
1/4-TURN FASTENERS DIFF PSI ALT 1000 FT X RATE 1000 FPM X
PRESSURE PORT
1/4-TURN FASTENER
(4 LOCATIONS) ELECTRICAL CONNECTORS
PRESSURIZATION AND INDICATION WARNING MODULE
A
Pressurization and Indication Warning Module Installation Figure 401
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21-33-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
B. Access
(1)
Location Zones
211/212 Control Cabin - Section 41
C.
Procedure
S 034-009
CAUTION: MAKE SURE THE DIFFERENTIAL PRESSURE SENSOR AND THE
_______ PRESSURIZATION AND INDICATION WARNING MODULE ARE CORRECT TO USE TOGETHER. LOOK AT THE ILLUSTRATED PARTS CATALOG TO MAKE SURE YOU HAVE THE CORRECT PART NUMBER EFFECTIVITY FOR THE TWO COMPONENTS WHEN YOU REPLACE EITHER COMPONENT. IF THE TWO COMPONENTS ARE NOT CORRECT, AN INCORRECT INDICATION WILL OCCUR.
(1)
Remove the cabin pressure port plug from the warning module.
S 434-010
(2)
Connect the two electrical connectors to the warning module.
S 424-011
(3)
Put the warning module in the P5 panel.
S 434-012
(4)
Tighten the 1/4-turn fasteners.
S 214-013
(5)
Make sure the cabin altimeter needle is aligned with OFF.
S 214-014
(6)
Make sure the differential pressure needle is aligned with OFF.
S 864-015
(7)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:
(a)
11B12, CABIN DIFF PRESS IND
(b)
11B13, CABIN ALTM
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