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 B.  In this procedure, the pressurization and indication warning module is referred to as the warning module. The warning module is on the pilot's overhead panel, P5.
 C.  The warning module shows the cabin-to-ambient differential pressure, the cabin altitude, and the rate of increase or decrease of the cabin pressure.
 TASK 21-33-01-004-001
 2.  Remove the Pressurization and Indication Warning Module
_______________________________________________________
 A.  References
 (1)  
24-22-00/201, Electrical Power Control

 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
 ALL  ú ú 01 Page 401 ú Jun 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
 ALL  ú ú 01 Page 402 ú Jun 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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