26-23-04
 EXTINGUISHING SYSTEM  ú ú 01 Page 403 ú Sep 20/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 IN-LINE PRESSURE SWITCH - REMOVAL/INSTALLATION
______________________________________________
 1.  General_______
 A.  This procedure has these tasks:
 (1)  
A removal of the in-line pressure switch for the lower cargo fire extinguishing system.

 (2)  
An installation of the in-line pressure switch.

 B.  The removal/installation procedure is the same for each in-line pressure switch.
 C.  The in-line pressure switches are located in the area of the cargo fire extinguisher bottles, in the lower aft compartment, forward of the aft cargo compartment forward end liner panel.
 TASK 26-23-05-004-001
 2.  Remove the In-Line Pressure Switch (Fig. 401)__________________________________
 A.  References
 (1)  AMM 25-50-03/401, Bulkhead Lining - Removal/Installation
 B.  Access
 (1)  Location Zones
 151 Forward of Aft Cargo Compartment (Left)
 152 Forward of Aft Cargo Compartment (Right)

 C.  Prepare for the Removal
 S 864-002
 (1)  
Open these circuit breakers on the main power distribution panel, P6, and attach a DO-NOT-CLOSE tag:

 (a)  
6H5, FIRE EXTINGUISHING CARGO BTL 1

 (b)  
6H6, FIRE EXTINGUISHING CARGO BTL 2

 (2)  
Open the door to the aft cargo compartment.

 S 014-003

 (3)  
Remove the bulkhead lining from the forward wall of the cargo compartment to get access to the pressure switch (AMM 25-50-03/401).

 S 014-017
 D.  Removal
 S 024-013
 (1)  Loosen the connector on the inlet tube.
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 26-23-05
 ALL  ú ú 04 Page 401 ú Sep 20/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

CARGO FIRE EXT 
BOTTLE NO. 1, 
M10466 
CARGO FIRE EXT 
BOTTLE NO. 2, 
AFT CARGO  M10467 
DOOR, 822 

BOTTLES, M10466,M10467 EXTINGUISHING CARGO FIRE SEE A  SEE B DISCHARGE LINE PRESSURE SWITCH, 1 S633  FWD 
FORWARD DISCHARGE LINE SEE B PRESSURE SWITCH, S633 TO FORWARD COMPARTMENT  TO AFT COMPARTMENT 
BOTTLE NO. 2, M10467 CARGO FIRE EXTINGUISHER 
BOTTLE NO. 1, M10466 CARGO FIRE EXTINGUISHER 
HARD POINT CONNECTOR  CONNECTOR HARD POINT 

1
AIRPLANES PRE-SB 26-20
A2 2
AIRPLANES POST-SB 26-20
Cargo Fire Extinguisher Bottle/Discharge
Line Pressure Switch Installation
Figure 401 (Sheet 1)

G23682
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 26-23-05
 ú ú 10 Page 402 ú Jan 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

SEE  A1 
TO FORWARD (YELLOW) COMPARTMENT  (BLUE) COMPARTMENT TO AFT 
BSEE SWITCH, S633 FORWARD DISCHARGE LINE PRESSURE 
CARGO FIRE EXTINGUISHER BOTTLE NO. 1, M10466  M10467 BOTTLE NO. 2, CARGO FIRE EXTINGUISHER 

CONNECTOR HARD POINT  CONNECTOR HARD POINT 
FILTER/DRIER  REGULATOR  A1  FILTER/DRIER  AFT METERED DISCHARGE LINE PRESSURE SWITCH, S10565 BSEE 
Cargo Fire Extinguisher Bottle/Discharge Figure 401 (Sheet 2) Line Pressure Switch Installation 

G23691
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