S 034-005

 (4)  
Loosen the quarter-turn fasteners at the corners of the pressure control module.

 S 024-027
 WARNING: HOLD THE PRESSURE CONTROL MODULE WHEN YOU RELEASE THE
_______ FASTENERS. IF THE MODULE FALLS, INJURY TO PERSONNEL AND DAMAGE TO EQUIPMENT CAN POSSIBLY OCCUR.
 (5)  Remove the pressure control module.
 TASK 21-31-25-404-002Pressure Control Module Installation
____________________________________
 A.  References
 (1)  21-31-00/201, Pressurization Control System
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-31-25
 ALL  ú ú 01 Page 401 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
FORWARD OVERHEAD PANEL
SEE A
ELECTRICAL
CONNECTOR

PRESSURE CONTROL PANEL SEE B
0  ALT  AUTO  STANDBY  MANUAL 
10  1  HORN  V 
9  40 35 50  CABIN 0 ALT  5  2  CUTOUT  00000 FLT ALT  DECR  INCR  V L A 
8  X 1000 FEET 30 20 25 15 6 5 7  10 4  3  00 000  00 000 CAB ALT CABIN RATE  C L O S E  O P E N  E 
LAND ALT  STBY  AC 
LIMIT:TAKE-PRESS DIFF  MAN 
OFF & LDG  1  2  F  G AUTO  DC 
.125 PSI  3  L  R 
0 UP  4  T  D  CHECK 
DN  3  .8CAB 1.9 2.9 3.9 5.0 5.1 6.0 6.8 7.6-.3 .3 1.4 2.4 3.4 4.4 5.0 5.6 6.4 7.2 8.0 
1  2  18FLT  ALTITUDE X 1000 FEET-MAX PRESS SCHEDULE 20 22 24 26 28 30 32 34 36 

FORWARD OVERHEAD PANEL (P5) (LOWER RIGHT PART)
A
QUARTER-TURN FASTENER (4 LOCATIONS)
PRESSURE CONTROL PANEL B
Pressure Control Module Installation Figure 401
C97104
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 B. Access
 (1)  Location Zone
 102 Right Control Cabin

 C. Procedure
 S 014-036
 (1)  
Lower the P5 panel.

 S 424-011

 (2)  
Install the pressure control module completely into the forward overhead panel.

 (a)  Turn the four quarter-turn fasteners to hold the module.
 S 434-010
 (3)  
Connect the electrical connector.

 S 714-013

 (4)  
Do the pressurization control system - maintenance practices (AMM 21-31-00/201).

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 ALL  ú ú 01 Page 403 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 PRESSURIZATION RELIEF VALVES - DESCRIPTION AND OPERATION
________________________________________________________
 1.  General_______
 A.  Pressurization relief valves are installed in the airplane to prevent excessive positive and negative cabin-to-ambient pressure differentials.
 B.  Relief valves in the airplane include two safety relief valves, the pressure and relief valve, two pressure equalization valves, and five blowout panels (Fig. 1).
 C.  The safety relief valves protect against excessive differential when cabin pressure is above ambient. The pressure and relief valve provides protection from ambient pressure being higher than cabin.
 D.  A pressure equalization valve in each of the cargo compartments allows pressure in the cargo compartments to vary with changes in cabin pressure. The compartments are isolated from the normal conditioning airflow.
 E.  Blowout panels in the forward bulkhead, aft bulkhead and ceiling of the forward cargo compartment and ceiling of the aft cargo compartment protect the respective structure from extremely fast pressure changes.
　
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