(2)  
21-31-00/201, Pressurization Control System

 (3)  
21-31-21/401, Pressure Controller

 C. Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panel
 1201L Electronic Equipment Access Door

 D. Procedure
 S 014-005
 (1)  Get access to the top shelf of the E1 rack.
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 S 424-006
 (2)  Install the delta P module (Ref 20-10-07/201). (a) Use the screwlocks, stand offs, lock washers and the nuts to install the delta P module (Fig. 401).
 NOTE:____ Do not install the flat washers. You need to discard the flat washers that come with the new delta P
 module.
 (b) (c)  Connect the electrical connector, D1872, to the delta P module.Do this check to make sure the delta P module is connected correctly to the electrical connector, D1872: 1) Measure the electrical resistance at pin 22 and pin 31 of the electrical connector, D948B, for the cabin pressure controller.
 a)  Make sure the electrical resistance is 95,980 (+/-1000) ohms.
 2)  Measure the electrical resistance at pin 3 and pin 41 of the electrical connector, D948A, for the cabin pressure controller.
 a)  Make sure the electrical resistance is 400 (+/-10) ohms.
 S 024-011
 (3)  Install the pressure controller (Ref 21-31-21/401).
 S 414-021
 (4)  Install one of these components, that was removed, on the E1-1 shelf:
 (a) (b) (c) (d)  AUTO-SLAT CMPTR NO. 2DGTL STALL WRN CMPTR NO. 2STALL MGMT CMPTR NO. 2CABIN TEMP CONT module
 S 864-016
 (5)  Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P6 panel: (a) MAN DC (b) STBY DC (c) AUTOMATIC DC (d) AUTOMATIC AC (e) MAN AC (f) STBY AC (g) All the circuit breakers on the CONTROL CABIN LIGHTING module (h) LANDING GEAR LIGHTS
 S 864-017
 (6)  Remove the DO-NOT-CLOSE tag and close the No. 1 AIR DATA COMPUTER circuit breaker on the P18 panel.

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 S 714-007
 (7)  Do the operational test of the pressurization control system to make sure the delta P module and the pressure controller will operate (Ref 21-31-00/201).
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 1.

2.

3.

A
737-300/400/500MAINTENANCE MANUAL
 PRESSURE CONTROL MODULE - REMOVAL/INSTALLATION
______________________________________________General
_______
 A.  The pressure control module is located on the lower right part of the P5 forward overhead panel in the flight deck.
 TASK 21-31-25-004-001
Pressure Control Module Removal (Fig. 401)

_______________________________

 A.  Access
 (1)  Location Zone
 102 Right Control Cabin

 B.  Procedure
 S 864-003
 (1)  Open these circuit breakers on the P6-4 panel and attach
 DO-NOT-CLOSE tags:

 (a)  
AUTOMATIC AC and DC

 (b)  
STBY AC and DC

 (c)  
MAN AC and DC

 S 014-004
 (2)  
Lower the P5 panel to get access to the pressure control module on the forward overhead panel in the flight deck.

 S 034-007

 (3)  
Disconnect the electrical connector.
　
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