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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 E. Do a check of the outflow valve.
 S 212-042
 (1)  
Make sure none of these conditions has occurred:

 (a)  
The gear box does not have a grease leak.

 (b)  
The flapper doors and hinges do not have cracks or are not loose.

 (c)  
The connecting rods and connecting rod bolts are not damaged, worn, or corroded.

 (d)  
The teflon and butyl rubber seals are not damaged or worn and do not have any grease on them.

 (e)  
The actuator is not loose.

 (f)  
The outflow valve frame is not cracked.

 (g)  
The outflow valve bolts are not loose.

 S 902-043
 (2)
If one or more of the above conditions has occurred, replace the worn or corroded parts and/or tighten the loose fasteners.

 F.
Put the Airplane Back to Its Usual Condition

 S 412-044
 (1)  
If the valve was inspected from the bulk cargo compartment, then do the steps that follow:

 (a)  
Install the endliner on the aft end of the bulk cargo compartment (AMM 25-50-03/401).

 (b)  
Close the aft cargo door, 822 (AMM 06-46-00/201).

 S 862-047
 (2)  
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

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 CABIN PRESSURE OUTFLOW VALVE ACTUATOR - REMOVAL/INSTALLATION
____________________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is the removal of the actuator for the cabin pressure outflow valve. The second task is the installation of the actuator for the cabin pressure outflow valve.
 B.  You can remove the actuator but not remove the cabin pressure outflow valve (AMM 21-31-03/201). The valve and actuator are aft of the bulk cargo compartment at approximately STA 1650 on the bottom left side of the airplane skin.
 TASK 21-31-04-004-001
 2.  Remove the Cabin Pressure Outflow Valve Actuator (Fig. 401)________________________________________________
 NOTE: You can get access to the actuator through the No. 2 cargo door, 822,
____ or through the outflow valve doors. Only use the access through the outflow valve doors when it is not possible to get access through the bulk cargo compartment.
 A.  References
 (1)  
AMM 06-46-00/201, Entry, Service and Cargo Doors Access Doors and Panels

 (2)  
AMM 24-22-00/201, Electrical Power Control

 (3)  
AMM 25-50-03/401, Bulkhead Lining

 B.  
Access

 (1)  
Location Zones
 153/154 Aft Cargo Compartment

 C.  
Procedure

 S 014-002
 (1)
If access is through the cargo compartment, do these steps:

 (a)  
Open the No. 2 cargo door, 822 (AMM 06-46-00/201).

 (b)  
Remove the aft endliner and find the cabin pressure outflow valve (AMM 25-50-03/401).

 S 014-003
 (2)
If access is through the outflow valve doors, do these steps:

 (a)  
Set the CABIN ALTITUDE CONTROL MODE SELECT switch on the pilots overhead panel, P5, to MAN.

 (b)  
Turn the MANUAL selector to CLIMB until the outflow valve is fully open.

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