SIDEWALL LAVATORY (EXAMPLE)
Lavatory Lights Ballast Installation
Figure 401 (Sheet 2)

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A
747-400 MAINTENANCE MANUAL
 LAVATORY CALL RESET SWITCH - REMOVAL/INSTALLATION
_________________________________________________
 1.  General_______
 A.  This procedure contains the tasks that remove and install the lavatory call reset switch.
 TASK 33-26-06-004-001
 2.  Lavatory Call Reset Switch - Removal (Fig. 401)____________________________________
 A.  References
 (1)
SSM 33-26-01 thru 33-26-02

 (2)
IPC 33-26-00 Fig. 50

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

 C.  Switch Removal
 (1)  S 864-003Remove electrical power from the switch: (a) Open each applicable circuit breaker and attach the DO-NOT-CLOSE tag: 1) On the DC power distribution panel, P180.
 (2)  S 034-004Turn the switch cover counterclockwise and remove it from the switch.
 (3)  S 034-005Turn the switch retainer that is behind the panel 45 degrees and remove it through the square hole in the lavatory panel.
 (4)  S 024-006Pull the switch assembly through the square hole in the panel.
 (5)  S 034-007Disconnect the electrical wires from the switch.

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747-400
MAINTENANCE MANUAL

Lavatory Call Rest Switch Component Location
Figure 401

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747-400 MAINTENANCE MANUAL
 TASK 33-26-06-404-008
 3.  Lavatory Call Reset Switch - Installation (Fig. 401)_________________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
SSM 33-26-01 thru 33-26-02

 (3)  
IPC 33-26-00 Fig. 50

 B. Access
 (1)  Location Zone 200 Upper Half of Fuselage
 C. Switch Installation
 S 434-009
 (1)  
Connect the electrical wires to the reset switch.

 S 424-010

 (2)  
Put the switch assembly through the square hole in the panel.

 S 434-011

 (3)  
Install the switch retainer on the switch.

 S 434-012

 (4)  
Put the switch retainer through the square hole in the panel.

 S 434-013

 (5)  
Turn the switch and the switch retainer 45 degree to lock the corners of the retainer to the panel.

 S 434-014

 (6)  
Install and tighten the switch cover.

 D. Switch Test
 S 864-023
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-015

 (2)  
Remove each DO-NOT-CLOSE tag.

 (a)  Close each circuit breaker that was opened.
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