(b)  
Attach the trim plate to the door lock switch with screws.

 (c)  
Install the trim plate and the door lock switch in the door frame.

 (d)  
Install the screws that attach the trim plate and the door lock switch to the lavatory door frame.

 (e)  
Close these circuit breakers and remove DO-NOT-CLOSE tag: 1) P180 DC Power Distribution Panel a) 180F19 LAV DOOR LOCK IND

 2)  P414 Power Distribution Panel Ctr-L a) 414E11 LAV LIGHTS
 D.  Do an Operational Test of the Door Lock Switch.
 S 864-032
 (1)  Prepare to do a test of the door lock switch:
 (a)  Supply electrical power (AMM 24-22-00/201).
 WARNING: YOU MUST CAREFULLY FOLLOW THE STEPS IN THE REFERENCED TASK
_______ TO PREPARE THE SAFETY SENSITIVE SYSTEMS FOR THE AIR MODE. FAILURE TO FOLLOW THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF THE AIR PLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (b)  
Do the "Prepare Safety-Sensitive Systems for Air Mode Simulation" task (Ref 32-09-02/201).

 (c)  
Open this circuit breaker and attach a DO-NOT-CLOSE tag on the P7 Overhead Circuit Breaker Panel: 1) 7F23 LANDING GEAR DSP & CONT ALTN

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747-400 MAINTENANCE MANUAL
 (d)  
Make sure the lavatory fluorescent light comes on.

 (e)  
Make sure the LOCK DOOR sign comes on.

 S 714-033
 (2)  Do a test of the door lock switch:
 (a)  
Go into the lavatory, close the door, and set the door lock bolt to the LOCK position.

 (b)  
Make sure the LOCK DOOR sign goes off.

 (c)  
Make sure the lavatory ceiling light changed from a dim intensity to a bright intensity.

 S 864-034
 (3)  Put the airplane in its usual condition:
 (a)  
Close this circuit breaker and remove the DO-NOT-CLOSE tag from the P7 Overhead Circuit Breaker Panel. 1) 7F23 LANDING GEAR DSP & CONT ALTN

 (b)  
Do the "Put Safety-Sensitive Systems Back to the Condition Before Air Mode Simulation" task (Ref 32-09-02/201).

 (c)  
Remove the electrical power if it is not necessary
 (Ref 24-22-00/201).

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MAINTENANCE MANUAL

Lavatory Door Lock Switch Installation
Figure 401

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 LAVATORY LIGHTS BALLAST - REMOVAL/INSTALLATION
______________________________________________
 1.  General_______
 A.  This procedure has the tasks that remove and install ballasts for the lavatory ceiling lights.
 TASK 33-26-05-024-021
 2.  Ballast Removal_______________
 A.  References
 (1)  SSM 33-26-01
 B.  Access
 (1)  Location Zone
 200 Lavatory Interior

 C.  Ballast Removal
 S 864-041
 (1)  Remove electrical power from the lavatory light:
 (a)  Open each applicable circuit breaker and attach the DO-NOT-CLOSE tag: 1) On the power distribution center panel, P414.
 S 014-042
 (2)  Open the lavatory PSU panel as follows to get access to the light ballast:
 (a)  
Put a small rod into the pin hole on the PSU panel.
　
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