21-31-01
 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

 (2)  
AMM 21-31-02/401, Automatic Pressure Controller

 (3)  
AMM 24-22-00/201, Electrical Power Control

 B.
Access

 (1)  
Location Zones
 211/212 Control Cabin - Section 41
 821 Forward Cargo Door

 C.
Procedure

 S 424-008
 (1)  Put the cabin pressure selector in position for installation.
 S 434-015
 CAUTION: BE SURE TO CONNECT THE ELECTRICAL CONNECTORS TO THEIR PROPER
_______ LOCATION ON THE CABIN PRESSURE SELECTOR PANEL. CROSS CONNECTION OF THE CONNECTORS CAN CAUSE THE AIRPLANE SYSTEM TO MALFUNCTION.
 (2)
Connect the electrical connectors to the cabin pressure selector.

 S 424-010

 (3)  
Carefully move the cabin pressure selector into the P5 panel.

 S 434-011

 (4)  
Tighten the 1/4-turn fasteners (4) on the selector panel.

 S 864-009

 (5)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:

 (a)  
11B14, CABIN ALTITUDE CONTROL MANUAL

 (b)  
11B15, CABIN ALTITUDE CONTROL SELECT

 (c)  
11N15, CABIN ALTITUDE CONTROL AUTO 1

 (d)  
11N24, CABIN ALTITUDE CONTROL AUTO 2

 S 704-010
 (6)  
Do a test of the cabin pressure selector.

 (a)  
Supply electrical power (AMM 24-22-00/201).

 (b)  
Set the CABIN ALTITUDE CONTROL MODE SEL switch to AUTO 1.

 (c)  
Open the forward (No. 1) cargo door, 821 (AMM 06-46-00/201).

 (d)  
Open the E5 rack access panel immediately forward of the cargo door and find the cabin pressure controllers.

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757
MAINTENANCE MANUAL

 (e)  
Before you use the cabin pressure controller BITE, wait a minimum of two minutes after you close the circuit breakers in the above steps.

 (f)  
Push the PRESS/TEST button on the controller for a lamp check. 1) Make sure all eight fault indicator lamps come on. 2) If all the lamps do not come on, replace the controller

 (AMM 21-31-02/401).

 (g)  
Push the VERIFY button and wait for the VERIFY MODE lamp to go off. 1) If the SELECTOR fault lamp comes on, replace the cabin

 pressure selector.

 (h)  
Close the E5 access panel and the forward cargo door, 821.

 (i)  
Remove electrical power, if it is not necessary.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A

757 MAINTENANCE MANUAL
 AUTOMATIC PRESSURE CONTROLLER - REMOVAL/INSTALLATION
____________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is the removal of the automatic pressure controller. The second task is the installation of the automatic pressure controller.
 B.  The airplane's two automatic pressure controllers are the same. They are in the E5 electrical/electronics rack.
 TASK 21-31-02-004-001
 2.  Remove the Automatic Pressure Controller (Fig. 401)________________________________________
 A.  References
 (1)  
AMM 06-41-00/201, Fuselage Access Doors and Panels

 (2)  
AMM 20-10-01/401, E/E Rack Mounted Components

 B.  
Access

 (1)  
Location Zones
 211/212 Control Cabin - Section 41
 821 Forward Cargo Door

 C.  
Procedure

 S 864-002
 (1)  
　
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