3.  Air Conditioning Compartment Lights
A.  The right and left air conditioning equipment compartments each have four floodlights, and share a floodlight mounted near the airplane centerline. The floodlights are mounted to brackets which are attached to structural members. The floodlights are oriented to provide maximum equipment illumination. A toggle switch located near the access door is provided for each side. (See figure 1.)
B.  The 28-volt ac ground service bus supplies electrical power for light operation through the A/C COMPT LIGHT circuit breaker on the P18 circuit breaker panel. Setting either left or right air conditioning compartments to ON and OFF turns the four floodlights in that compartment and the center floodlight on and off. However, both right and left compartment switches must be in the OFF position to turn the center floodlight off.
4.  Wheel Well Lights
A.  One wheel well dome light and one gear inspection floodlight are installed in each nose wheel well and main wheel well. The main wheel well lights are controlled by a switch on the forward overhead panel and one switch in the forward left main wheel well area. Nose wheel well lights are controlled by a switch on the forward overhead panel and one switch on the external power receptacle panel in the nose wheel well. (See figure 1.)
B.  The 28-volt ac ground service bus supplies electrical power through the WHEEL WELL circuit breaker on circuit breaker panel P18. Setting the WHEEL WELL light switch on the overhead panel to ON, turns all wheel well lights on. Setting either the main wheel well light switch or the nose wheel well light switch to ON will turn the applicable wheel well lights on. The switch used to turn the lights on must be used to turn the lights off. (See figure 5.)
5.  Electrical Rack Lights
A.  The electrical electronics equipment rack area is illuminated by two dome lights. A toggle switch located near the forward dome light and above the access door provides control. (See figure 1.) The 28-volt ac ground service bus supplies electrical power for light operation. (See figure 5.)
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502  Cargo and Service Compartment Lights 
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6.  Forward Lower Service Compartment Lights
A.  The forward lower service (nose) compartment is illuminated by three dome lights mounted on the ceiling area. A toggle switch located near the aft edge of the access door provides control. (See figure 1.) The 28-volt ac ground service bus supplies electrical power for light operation. (See figure 5.)
7.  APU Compartment Light
A.  The APU compartment is illuminated by a single explosion-proof dome light. A toggle switch located near the light provides control. (See figure 1.) The 28-volt ac ground service bus supplies electrical power for light operation. (See figure 5.)
8.  Tail Cone Compartment
A.  The tail cone compartment is illuminated by a single dome light. A toggle switch adjacent to the access door provides control. (See figure 1.) The 28-volt ac ground service bus supplies electrical power for light operation. (See figure 5.)
9.  Accessory Compartment Lights
A.  The accessory compartment is illuminated by two floodlights. A pushbutton switch located near the access door provides control. (See figure 1.) The 28-volt ac ground service bus supplies electrical power for light operation.
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503  Cargo Compartment Lights Simplified Schematic 
Nov 15/77  Figure 2  33-31-0 
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Air Conditioning Component Lights Simplified Schematic  520 
33-31-0  Figure 3  Aug 15/72 
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520  Wheel Well Lights Simplified Schematic 
Aug 15/72  Figure 4  33-31-0 
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Service Compartment Lights Simplified Schematics  520 
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