DELTA P MODULE - REMOVAL/INSTALLATION
1. General
A.  The delta P module is located on the top shelf of the forward equipment rack in the electronic equipment compartment.
2.  Remove Delta P Module (Fig. 401)
A.  Make sure that these circuit breakers on the P6 panel are open.
(1)  
MAN DC

(2)  
STBY DC

(3)  
AUTOMATIC DC

(4)  
AUTOMATIC AC

(5)  
MAN AC

(6) 
 STBY AC

(7)  
ALL CONTROL CABIN LIGHTS module CBs

(8)  
LANDING GEAR LIGHTS

B.  Make sure that No. 1 AIR DATA COMPUTER circuit breaker on the P18 panel is open.
C.  Remove the pressure controller (Ref 21-31-21 R/I).
D.  Disconnect connector D1872 from delta P module.
E.  Remove screwlocks, lockwashers, standoffs, and nuts and remove delta P module from bracket on E1-1 shelf.
3.  Install Delta P Module
A.  Install serviceable delta P module on E1-1 shelf using screwlocks, standoffs, lockwashers and nuts (Fig. 401).
B.  Install connector D1872 onto delta P module.
C.  Ensure resistance between pins 22 and 31 of connector D948B is 95,980\+1000 ohms.
D.  Ensure resistance between pins 3 and 41 of connector D948A is 400\+10 ohms.
NOTE:  The above two steps ensure that the delta P module connector P1 is correctly mated to connector D1872.
E.  Install pressure controller (Ref 21-31-21 R/I).
500 
Jun 20/92  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-31-22 Page 401 

A45277
Delta P Module Installation  500 
21-31-22Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Nov 01/98 

PRESSURE CONTROL PANEL – REMOVAL/INSTALLATION
1. General
A.  The pressure control panel is located on the lower right part of the P5 forward overhead panel in the flight deck.
2.  Remove Pressure Control Panel (Fig. 401)
A.  Open these circuit breakers on the P6 panel.
(1)  
AUTOMATIC AC and DC

(2)  
STBY AC and DC

(3)  
MAN AC and DC

B.  Lower the P5 panel to get access to the pressure control panel on the forward overhead panel in the flight deck.
C.  Disconnect the electrical connector.
D.  Loosen the quarter-turn fasteners at the corners of the pressure control panel.
WARNING:  HOLD THE PRESSURE CONTROL PANEL WHEN YOU RELEASE THE FASTENERS. IF THE PANEL FALLS, INJURY TO PERSONNEL AND DAMAGE TO EQUIPMENT CAN POSSIBLY OCCUR.
E.  Remove the pressure control panel.
3.  Install Pressure Control Panel
A.  Lower the P5 panel.
B.  Install the pressure control panel completely into the forward overhead panel.
(1)  Turn the four quarter-turn fasteners to hold the panel.
C.  Connect the electrical connector.
D.  Do the pressurization control system operational test (Ref 21-31-0, MP).
500 
May 01/99  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-31-23 Page 401 

K16930
Pressure Control Panel Installation  500 
21-31-23Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/99 

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, a pressure and relief valve, two pressure equalization valves, and four blowout panels. (See figure 1.)
C.  During normal pressurization, control cabin pressure is maintained for passenger comfort throughout the cabin and cargo compartments. A failed pressure control, rapid changes in pressure of the cabin or cargo compartments, or a requirement for rapidly dropping the airplane altitude could cause damage to airplane components unless there are methods for relieving pressure differential.
D.  The safety relief valves protect against ambient to cabin pressure differential when cabin pressure is above ambient. The pressure and relief valve provides protection from ambient being higher than cabin as might be experienced in a high airplane rate of descent with no air input to the cabin.
E.  A pressure equalization valve in each of the cargo compartments allows pressure in the cargo compartments to vary with changes in cabin pressure although the compartments are isolated from the normal conditioned air ventilation of the cabin.
　
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