S 864-022
 S 864-023
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A
747-400 MAINTENANCE MANUAL
 SMOKE DETECTOR PRESSURE SWITCH - REMOVAL/INSTALLATION
_____________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task removes the pressure switch, S2259 or S2275, connected to the venturi ejector in the aft lower cargo compartment or the aft lower cargo compartment. The second task installs the pressure switch.
 TASK 26-16-04-004-001
 2.  Remove the Pressure Switch (Fig. 401)__________________________
 A.  References
 (1)  
AMM 36-00-00/201, Pneumatic Systems

 (2)  
AIPC 26-16-05, Fig. 1

 (3)  
WDM 26-16-11 thru WDM 26-16-16

 B.  Access
 (1)  Location Zones Fwd ejector 125 Area Below Aft Cargo Container Compartment L.H. 126 Area Below Aft Cargo Container Compartment R.H. Aft ejector 143 Area Below Aft Cargo Container Compartment L.H. 144 Area Below Aft Cargo Container Compartment R.H.
 C.  Procedure
 S 864-002
 (1)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  P7 Overhead Circuit Breaker Panel
 1) 7H14, CARGO SMOKE DETECT LWR A
 2) 7H15, CARGO SMOKE DETECT LWR B

 (2)
Depressurize the pneumatic crossover duct (AMM 36-00-00/201).

 S 864-003
 S 014-004
 WARNING:_______USE EAR PROTECTION IN THE AFT CARGO COMPARTMENT. THE HIGH NOISE LEVEL OF THE EJECTOR CAN CAUSE INJURY TO PERSONS.
 (3)  Remove the floor panel in the fwd lower cargo compartment at STA 970 to gain access to the S2259 ejector or the aft lower cargo compartment at STA 1530 to gain access to the S2259 ejector.
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A

747-400
MAINTENANCE MANUAL

SMOKE DETECTOR SMOKE DETECTOR PRESSURE SWITCH, S2259 PRESSURE SWITCH, S2275
SEE

SEE

VENTURI EJECTOR

PRESSURE SUPPLY LINE

PLATE
Smoke Detector Pressure Switch Installation
Figure 401

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E01181
A
747-400 MAINTENANCE MANUAL
 S 434-024
 (4)  
Disconnect the electrical connector, DS2259 (fwd ejector) or DS2275 (aft ejector), from the pressure switch.

 S 034-006

 (5)  
Disconnect the vacuum sense line from the ejector and the pressure switch.

 S 034-007

 (6)
Remove the four screws that hold the switch to the ejector.

 S 024-008

 (7)  
Remove the pressure switch.

 TASK 26-16-04-404-009
 3.  Install the Pressure Switch (Fig. 401)___________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 36-00-00/201, Pneumatic Systems

 (3)  
AIPC 26-16-05, Fig. 1

 (4)  
WDM 26-16-11 thru WDM 26-16-16

 B. Access
 (1)  Location Zones Fwd ejector 125 Area Below Aft Cargo Container Compartment L.H. 126 Area Below Aft Cargo Container Compartment R.H. Aft ejector 143 Area Below Aft Cargo Container Compartment L.H. 144 Area Below Aft Cargo Container Compartment R.H.
 C. Procedure
 S 424-010
 WARNING:_______USE EAR PROTECTION IN THE AFT CARGO COMPARTMENT. THE HIGH NOISE LEVEL OF THE EJECTOR CAN CAUSE INJURY TO PERSONS.
 (1)  
　
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