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A
747-400 MAINTENANCE MANUAL
 D.  Do a Test of the Power Supply
 NOTE:____You can do a test of all the power supplies together. Each power supply with a test switch can be tested independently.
 S 712-059
 (1) To do a test of all the power supplies together, do these steps:
 CAUTION: KEEP THE OPERATION OF THE EMERGENCY LIGHTS TO LESS THAN A
_______ ONE MINUTE. THE BATTERIES MUST KEEP A SUFFICIENT CHARGE TO OPERATE THE EMERGENCY LIGHTS FOR 15 MINUTES.
 (a)  
On the pilot's overhead panel, P5, set the EMER LIGHTS switch to the ON position. 1) Make sure the emergency lights connected to the power

 supply come on (SSM 33-51-01).

 (b)  
Set the EMER LIGHTS switch to the OFF position. 1) Make sure the emergency lights go off.

 S 712-060
 (2) To do a test a power supply with its test switch, do these steps:
 (a)  Push the test switch on the power supply. 1) Make sure the emergency lights connected to the power supply come on (SSM 33-51-01).
 2)  Make sure the emergency lights go off automatically after approximately 1 minute.
 S 412-061
 (3)  Close each panel that was opened to get access to the power supply.
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747-400 MAINTENANCE MANUAL
 DOOR (SILL) LIGHTS - MAINTENANCE PRACTICES
__________________________________________
 1.  General
_______
 A.  This procedure contains these tasks for the sill lights of a main deck door:
 (1)  
Door (Sill) Light - Lamp Replacement

 (2)  
Door (Sill) Light - Light Assembly Removal

 (3)  
Door (Sill) Light - Light Assembly Installation

 TASK 33-51-05-962-031
 2.  Door (Sill) Light - Lamp Replacement (Fig. 201)
____________________________________
 A.  References
 (1)  
AIPC 33-51-50

 (2)  
SSM 33-51-01 and 33-51-02

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

 C.  Procedure
 S 862-045
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  On the overhead circuit breaker panel, P7: 1) 7G14, CHG EMER LT
 S 012-002
 WARNING: MAKE SURE THE SELECTOR LEVER IS IN THE MANUAL POSITION BEFORE
_______ YOU OPEN THE DOOR. THE LEVER MUST BE IN THE MANUAL POSITION TO PREVENT THE SLIDE DEPLOYMENT. DEPLOYMENT OF THE SLIDE CAN CAUSE DAMAGE TO EQUIPMENT OR INJURY TO PERSONS.
 (2)  Open the door.
 S 492-003
 WARNING: INSTALL A SAFETY BARRIER ACROSS THE OPEN DOOR WHEN YOU DO NOT
_______ HAVE THE GROUND ACCESS EQUIPMENT INSTALLED. WHEN YOU DO NOT HAVE THE BARRIER INSTALLED, YOU CAN FALL THROUGH THE OPEN DOOR.
 (3)  
Install a safety barrier.

 S 012-004

 (4)  
Open the access panel in the top of the door frame to get access to the light assembly.

 (5)  
Remove the lens.

 (6)  
Carefully replace the lamp.

 S 032-026
 S 962-027
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747-400
MAINTENANCE MANUAL

ASSEMBLY
TYPICAL DOOR FRAME LIGHT ASSEMBLY INSTALLATION
A-A
Main Deck Floor Frame Light Installation Figure 201
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747-400 MAINTENANCE MANUAL
 S 432-028
 (7)  
　
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