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A

757
MAINTENANCE MANUAL

RECEPTACLE
DRIVE SCREW LOCK
NAMEPLATE LOCATION
MANUAL RESET PLUNGER DRIVE SCREW LOCK LOCKWIRE HOLES
B

Cargo Fire Extinguisher Bottle/Discharge
Line Pressure Switch Installation
Figure 401 (Sheet 3)

G23711
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MAINTENANCE MANUAL

 S 024-014
 (2)  
Disconnect the inlet tube from the pressure switch.

 S 034-005

 (3)
Disconnect the electrical connector from the pressure switch.

 S 034-006

 (4)  
Remove the screw, washer and clamp that hold the pressure switch to the airplane structure.

 S 024-007

 (5)  
Remove the pressure switch.

 TASK 26-23-05-404-008
 3. Install the In-Line Pressure Switch (Fig. 401)
___________________________________
 A. References
 (1)  
AMM 26-23-00/501, Cargo Fire Extinguishing System - Adjustment/Test

 (2)  
AMM 25-50-03/401, Bulkhead Lining - Removal/Installation

 B. Access
 (1)  Location Zones
 151 Forward of Aft argo Compartment (Left)
 152 Forward of Aft Cargo Compartment (Right)

 C. Prepare for the Installation
 S 864-010
 (1)  Make sure these circuit breakers are open.
 (a)  
6H5, FIRE EXTINGUISHING CARGO BTL 1

 (b)  
6H6, FIRE EXTINGUISHING CARGO BTL 2

 S 414-009
 (2)  
Open the door to the aft cargo compartment.

 S 014-010

 (3)  
Make sure the forward bulkhead lining is removed from the aft cargo compartment (AMM 25-50-03/401).

 D. Installation
 S 424-011
 (1)  
Put the pressure switch in its position on the airplane structure.

 S 424-021

 (2)  
Install the screw, washer and clamp that hold the pressure switch to the airplane structure.

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MAINTENANCE MANUAL

 S 434-013
 (3)  
Connect the inlet tube to the pressure switch.

 S 424-014

 (4)  
Tighten the connector on the inlet tube.

 S 424-015

 (5)  
Connect the electrical connector to the pressure switch.

 S 864-016

 (6)  
Push the reset button on the pressure switch.

 E. Do an installation test
 S 864-017
 (1)  Remove the DO-NOT-CLOSE tag and close these circuit breakers on the P6 panel:
 (a)  
6H5, FIRE EXTINGUISHING CARGO BTL 1

 (b)  
6H6, FIRE EXTINGUISHING CARGO BTL 2

 S 714-012
 (2)  Do this task: Operational Test - Bottle Pressure Switch
 (AMM 26-23-00/501).

 F. Put the Airplane Back to Its Usual Condition
 S 424-016
 (1)  
Install the forward bulkhead lining in the aft cargo compartment (AMM 25-50-03/401).

 (2)  
If it is necessary, close the aft cargo compartment door.

 S 414-011
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757 MAINTENANCE MANUAL
 LAVATORY WASTE COMPARTMENT AUTOMATIC FIRE EXTINGUISHING -
　
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