(7)  
Lower the liferaft door panel compressing the Gas Spring Assemblies and remove the Blocking tools.

 (8)  
Put the airplane back to its normal condition.

 S 424-011
 S 824-013
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 25-22-03
 ALL  ú ú 01 Page 404 ú Dec 20/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 SERVICE UNITS - DESCRIPTION AND OPERATION
_________________________________________
 1.  General_______
 A.  The service units are installed for passengers and attendants. The passenger service units (PSU) are above each row of seats. The attendant service units (ASU) are at each attendant seat. The lavatory service units (LSU) are in each lavatory.
 2.  Passenger Service Units (Fig. 1)_______________________
 A.  PSU's above the seats have reading lights, emergency oxygen equipment, no smoking fasten seat belt (NSFSB) signs, and attendant call switches. Speakers are supplied but not always installed in all PSU's. Inside the PSU's is an annunciator selector switch. The switch has two positions for zoning the passenger speaker system into forward and aft sections.
 B.  The PSU's have inboard and outboard support rails connected with tie bars. PSU's are hinged on the outboard side and latch on the inboard side. Small index holes in the PSU face panels release the latches. A lanyard prevents the panel from swinging completely open.
 3.  Attendant Service Units_______________________
 A.  Attendant Service Units are in lowered ceiling panels of doorways. ASU's have reading lights and emergency oxygen equipment. Emergency oxygen equipment includes a chemical oxygen bottle and masks.
 4.  Lavatory Service Units______________________
 A.  Lavatories have emergency oxygen, passenger advisory lights, and speakers. Emergency oxygen masks are stowed in all lavatory ceilings. Speakers are in either ceilings or wall dispensers. Passenger advisory lights are located around the sink cabinet.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 25-23-00
 ALL  ú ú 02 Page 1 ú Jan 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
OVERHEAD STORAGE BIN
LANYARD 
PSU 
(OPEN) 
PASSENGER 
SERVICE UNIT 
SEE  A  A-A 
ATTENDANT'S 
CALL SWITCH
READING LIGHT 
A  SWITCH 
ATTENDANT'S 
CALL SWITCH 

OXYGEN DOOR  SPEAKER  OXYGEN DOOR TEST STOP  A LATCH RELEASE POINT 
POINT LATCH RELEASE 
PASSENGER SERVICE UNIT (EXAMPLE) 
A 
Passenger Service Unit Figure 1 

C95283
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 25-23-00
 ALL  ú ú 02 Page 2 ú Mar 20/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 PASSENGER SERVICE UNITS - REMOVAL/INSTALLATION
______________________________________________
 1.  General_______
 A. This procedure has these tasks:
 (1)  
A task for the removal of the passenger service units (PSU).

 (2)  
A task for the installation of the passenger service units (PSU).

 (3)  
A task for the adjustment of the life vest access door.

 (4)  
A task for the removal and installtion of the standard spacer panel.

 (5)  
A task for the removal and installation of the PSU and the No Smoking Fasten Seat Belts (NSFSB) sign spacer panel.

 (6)  
A task for the removal and installation of the termination or transition spacer panel.

 TASK 25-23-01-004-012
 2.  Remove the PSU (Fig. 401)______________
 A. Equipment
 (1)  Latch Release Rod - Make from 0.125-inch
　
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