(d)
Make sure that the forward ceiling lights stay on.
(e)
Open this circuit breaker on the P415 Panel and attach a DO-NOT-CLOSE tag: 1) 415J23, CEILING LIGHT - MAIN DECK CENTER
(f)
Make sure that the center and aft ceiling lights stay on.
(g)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P415 Panel: 1) 415J22, CEILING LIGHTS - MAIN DECK FORWARD 2) 415J23, CEILING LIGHT - MAIN DECK CENTER
(h)
Make sure that all the ceiling lights stay on.
S 865-031
(8) Remove electrical power if it is not necessary (Ref 24-22-00/201).
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1.
2.
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A
747-400 MAINTENANCE MANUAL
CARGO COMPARTMENT LIGHTS - DESCRIPTION AND OPERATION
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General (Fig. 1)
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A. Dome lights evenly distributed throughout the cargo compartment areas provide the basic illumination for handling of cargo. Dome lights adjacent to doors illuminate cargo compartment entry areas. The 115-volt ac ground handling bus provides power to the lighting systems.
B. The exterior cargo handling areas are illuminated by lights mounted in the side of the airplane near the cargo compartment doors For more information about these lights, refer to AMM 33-46-00/001.
C. For more data about this lighting system, refer to these sources:
(1) SSM 33-37-01 thru 33-37-99
(2) WDM 33-37-11 thru 33-37-99Forward Cargo Compartment Lights
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A. The forward cargo compartment is illuminated by incandescent dome lights provided with protective shielding to prevent damage during cargo handling. Two of the lights located on the ceiling panel adjacent to the door provide entryway lighting when the door is raised to the open position. The remaining lights are mounted on the ceiling.
B. The 115-volt ac ground handling bus supplies primary power to the forward compartment light transformer on the P54 center equipment panel through a circuit breaker located on the P414 power distribution center - left. The 28-volt ac secondary output of the transformer supplies power to the lights through secondary circuit breakers located on the P54 panel. A toggle switch located on a panel at the cargo compartment door switches the lights off and on. The switch is connected between the power source and the high voltage side of the transformer.
Aft Cargo Compartment Lights
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A. The aft cargo compartment is illuminated by incandescent dome lights provided with protective shielding the same as for the forward cargo compartment. Two dome lights mounted on the ceiling panel adjacent to the door provide entryway illumination when the door is in the raised position. A dome light is mounted on each side of the bulk-cargo door to illuminate the entryway. The remaining dome lights are located on the compartment ceiling.
B. The 115-volt ac ground handling bus supplies primary power to the aft cargo compartment light transformer, located on the P59 aft lower cargo compartment equipment panel. The 28-volt ac transformer secondary output supplies power to the lights through secondary circuit breakers located on the P59 panel. Switches located one at each door, turn the lights on or off.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
LIGHT SWITCHES
AFT CARGO COMPARTMENT LIGHTS
LIGHT SWITCH
FWD CARGO COMPARTMENT LIGHTS
LENS RETAINING
CABLE
PULL TO REMOVE LENS MICROSWITCH
FOR RELAMPING (2 PLACES)
TYPICAL CARGO COMPARTMENT LIGHT
Cargo Compartment Lights Component LocationFigure 1
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