(2)  
32-09-02/201, Air/Ground Relays System

 (3)  
SSM 33-26-01

 B.  Access
 (1)  Location Zone
 200 Upper Deck Lavatory Interior

 C.  Procedure
 S 865-002
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 865-003

 (2)  
Make sure the circuit breakers for the lavatory lights are closed:

 (a)  
P180 DC Power Distribution Panel

 (b)  
P414 Power Distribution Center - Left

 (3)  
Do a Test of the Lavatory Lights

 S 715-004
 WARNING: YOU MUST CAREFULLY FOLLOW THE STEPS TO PREPARE THE
_______ SAFETY SENSITIVE SYSTEMS FOR THE AIR MODE. THE AUTOMATIC OPERATION OF THE AIRPLANE SYSTEMS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (a)  Do the "Prepare Safety-Sensitive Systems for Air Mode Simulation" task (Ref 32-09-02/201).
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A
747-400 MAINTENANCE MANUAL
 (b)
Open this circuit breaker and attach a DO-NOT-CLOSE tag.

 1)  P7 Overhead Circuit Breaker Panel a) 7F23 LANDING GEAR DSP & CONT ALTN

 (c)  
Make sure the lavatory ceiling lights are on.

 (d)  
Put the SEAT BELTS switch on the P8 panel to the ON position.

 (e)  
Make sure the RETURN TO SEAT sign is on.

 (f)  
Put the SEAT BELTS switch on the P8 Panel to the OFF position.

 (g)  
Make sure the RETURN TO SEAT sign is off.

 (h)  
Go into the lavatory.

 (i)  
Make sure the LOCK DOOR sign is on.

 (j)  
Close and lock the lavatory door.

 (k)  
Make sure the LOCK DOOR sign is off.

 (l)  
Make sure the lavatory ceiling light changes from a dim intensity to a bright intensity.

 D.  Put the airplane back to its usual condition.
 S 865-019
 (1)  Remove the DO-NOT-CLOSE tag and close this circuit breaker.
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7F23 LANDING GEAR DSP & CONT ALTN

 S 715-021
 (2)  
Do the "Put Safety-Sensitive Systems Back to the Condition Before Air Mode Simulation " task (Ref 32-09-02/201)..

 S 865-015

 (3)  
Remove electrical power if it is not necessary
 (Ref 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 LAVATORY FLUORESCENT LIGHTS - MAINTENANCE PRACTICES
___________________________________________________
 1.  General_______
 A. This procedure has the task that replaces lamps in lavatory lights.
 TASK 33-26-03-962-000
 2.  Fluorescent Lamp Replacement____________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
SSM 33-26-01

 (3)  
WDM 33-26-11 thru 33-26-99

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

 C. Lamp Replacement
 S 862-001
 (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 012-014
 (2)  
Remove the lens.

 (a)  
LIGHT ON THE CEILING; Put a small rod into the pin holes in the lens. 1) Release the PSU latch with the rod and open the panel.

 (b)  
LIGHT ON THE WALL; Remove the screws from the ends of the lens.

 (3)  
Carefully replace the lamp.

 S 412-002

 (4)  
　
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