B. Access
 (1)  Location Zone
 100 Lower Cargo Compartments, Interior

 C. Procedure
 S 424-025
 (1)  
Do these steps to install the transformer:

 (a)  
Put the lamp wires through the hole in the mounting plate.

 (b)  
Attach the mounting plate to the transformer with the screws, washers, and spacers.

 (c)  
Move the mounting plate (with the transformer) between the mounting brackets.

 (d)  
Attach the mounting plate (with the transformer) to the mounting brackets with the screws.

 (e)  
Connect the lamp and transformer wires to the terminal block on the mounting bracket.

 (2)
Install the sidewall insulation material (Ref 25-52-04/401).

 (3)  
Install the sidewall lining panel (Ref 25-52-01/401).

 S 864-018

 (4)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P414 Power Distribution Center Panel - Left 1) 414C25 LIGHT FWD CARGO

 (b)  
P59 Aft Lower Cargo Equipment Panel
 1) CARGO AREA LIGHTS

 S 414-026
 S 414-017
 S 714-028
 (5) Do these steps to do a test of the replacement transformer:
 (a)  Supply electrical power (Ref 24-22-00/201).
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A 747-400 MAINTENANCE MANUAL
 (b)  Put the switch for the applicable area light to ON.
 NOTE:____ The switches for the area lights can be found adjacent to the cargo doors.
 (c) (d) (e) (f)  Make sure the area light comes on.Put the area light switch to OFF.Make sure the area light is off.Remove electrical power if it is not necessary (Ref 24-22-00/201).

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A
747-400 MAINTENANCE MANUAL
 EMERGENCY LIGHTING - DESCRIPTION AND OPERATION
______________________________________________
 1.  General_______
 A.  Emergency lighting is available give lighting to the interior and exterior areas of the airplane necessary for the crew and passengers to quickly get out of the airplane. The lights will come on automatically if there is an electrical power failure. You can make the lights come on manually with a switch in the flight compartment or the passenger compartment.
 B.  Interior emergency lights consist of incandescent lamps that illuminate the passenger aisles, cross aisles, and entryways. Lighted exit signs are located in all the exit areas.
 C.  Exterior emergency lights consist of incandescent lamps installed in the doors, door frames, and the exterior to illuminate the emergency escape routes.
 D.  Battery operated power packs provide energy for the emergency lights.
 E.  Emergency lights are contained in one section.
 (1) Emergency Lights (AMM 33-51-00/001)
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 1.

2.

3.

4.

A
747-400 MAINTENANCE MANUAL
 EMERGENCY LIGHTS - DESCRIPTION AND OPERATION
____________________________________________
General
_______
 A.  In an electrical power failure, the emergency lights give lighting for the crew and passengers to quickly get out of the airplane via the emergency exit paths.
 B.  The 6 volts dc of electrical power for the emergency lights comes from batteries contained in power supplies. Bus 4 supplies 28 volts dc of electrical power to the control circuit of each power supply to keep its batteries charged.
　
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