25-23-01
 ALL  ú ú 04 Page 404 ú May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 S 024-091
 (10)
 Push the plunger on the outboard clamps to release the hinge points from the air conditioning extrusion.

 S 024-020

 (11)
 Remove the PSU.

 TASK 25-23-01-404-021
 3.  Install the PSU (Fig. 401)_______________
 A. Equipment
 (1)  Latch Release Rod - Make from 0.125-inch
 diameter X 6-inch long rod

 B. References
 (1)  
AMM 23-31-02/401, PSU Speakers

 (2)  
AMM 33-23-00/201, Reading Lights

 (3)  
AMM 33-24-00/201, Passenger Signs

 (4)  
AMM 33-25-00/201, Call Lights

 (5)  
AMM 35-21-00/501, Passenger Oxygen System

 (6)  
AMM 35-21-04/201 Oxygen Generator

 C. Access
 (1)  Location Zone
 200 Upper Half of Fuselage

 D. Procedure
 S 864-022
 (1)  
Put the outboard edge of the PSU on the air conditioning extrusion.

 S 424-092

 (2)  
Push the plungers and attach the outboard clamps to the index holes in the air conditioning extrusion.

 (3)  
Attach the lanyard to the in-line hole on the PSU support structure.

 (4)  
Connect the electrical connector.

 S 424-094

 (5)  
GUN 004-999;
 Do the steps that follow:

 S 424-024
 S 424-093
 (a)  Remove the cap from the oxygen supply hose and the PSU manifold fitting.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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757
MAINTENANCE MANUAL

 (b)  Connect the oxygen supply hose to the PSU manifold fitting.
 S 864-028
 (6)  If the PSU is in first class, set the call select switch to the forward attendant station, otherwise set it to the aft attendant station.
 NOTE: You can get access to the passenger call select switch when
____ the PSU is lowered. Usually, the passenger call select switch is near the passenger reading light assembly.
 S 444-079
 WARNING: YOU MUST REMOVE THE SAFETY PIN TO ACTIVATE THE OXYGEN
_______ GENERATOR. IF YOU REMOVE THE SAFETY PIN INCORRECTLY, THE OXYGEN GENERATOR CAN ACCIDENTALLY FIRE. THE SURFACE TEMPERATURE OF A FIRED OXYGEN GENERATOR CAN GET AS HOT AS 450 DEGREES FAHRENHEIT AND CAUSE INJURY TO PERSONS. IF YOU DO NOT REMOVE THE SAFETY PIN, THE OXYGEN GENERATOR WILL NOT OPERATE.
 (7)  Remove the safety pin from the oxygen generator (Ref. 35-21-04/201, task Oxygen Generator- Activation).
 S 864-082
 CAUTION: PUT THE WIRE BUNDLE/GASPER HOSE BRACKET 7 1/2 +/- 4 INCHES
_______ FORWARD OF THE AFT EDGE OF THE PSU PANEL. THE WIRE BUNDLE/GASPER HOSE BRACKET WILL CUT THE OXYGEN HOSE IF THE BRACKET IS PUT ADJACENT TO THE OXYGEN GENERATOR.
 (8)  
Lift the PSU up until the latches are engaged.

 S 714-080

 (9)  
Do these steps to put a mark on the latch release rod you will use during the PSU latch check:

 (a)  Open the PSU.
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757 MAINTENANCE MANUAL
 (b)  
Put the latch in the closed position.

 (c)  
Put the latch release rod in the hole where the latch is closed.

 (d)  
Make a mark on the latch release rod to show the distance the rod goes in the hole of a fully closed latch.

 NOTE: You will use this mark to make sure the other latches
____ are in fully closed position.
 (e)  
Put the latch in the open position.

 (f)  
Close the PSU.

 S 714-081
 (10)
　
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