(1)
Service Compartment Lights (AMM 33-31-00/001)
(2)
Main Deck Cargo Handling Lights (AMM 33-35-00/001)
(3)
Cargo Compartment Lights (AMM 33-37-00/001)
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ALL ú ú 03 Page 1 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
SERVICE COMPARTMENT LIGHTS - DESCRIPTION AND OPERATION
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General (Fig. 1)
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A. The service compartment lights provide general illumination for servicing the following areas: wheel wells, air conditioning compartment, tail cone, APU compartment, and electrical/electronic equipment centers. Incandescent dome light assemblies with conveniently located toggle switches provide lighting and control for all areas except the upper equipment center-left, and the aft equipment center which have utility lights attached by a 50-inch flexible cord similar to the flight compartment utility lights (Ref 33-15-00).
B. The following buses supply primary 28-volt power to the service compartment lights through the associated transformers and switches. 115-volt ac ground handling bus. 115-volt ac ground service transfer bus. 28-volt ac ground service bus, and 28-volt dc ground handling bus.
C. For more data about this lighting system, refer to these sources:
(1) SSM 33-31-01 thru 33-31-99
(2) WDM 33-31-11 thru 33-31-99Wheel Well Lights
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A. Nose Wheel Well Lights
(1) Explosion-proof dome light assemblies are mounted in the ceiling of the nose wheel well to provide area illumination for servicing. A LIGHTS toggle switch mounted on the nose wheel well control panel provides control.
B. Main Wheel Well Lights
(1) Explosion-proof dome light assemblies are mounted in each of the four main wheel wells to provide area illumination for servicing. Toggle switches are provided for control. A toggle switch is on each aft wheel well panel adjacent to the inboard landing gear.
Air Conditioning Compartment Lights
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A. Explosion-proof dome light assemblies are located in the air conditioning compartment to provide area illumination for servicing. A toggle switch, located in the ground service pneumatic connector panel aft of the air conditioning compartment aft bulkhead and approximately 30 inches left of the airplane centerline, provides control.
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33-31-00
ALL ú ú 01 Page 1 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
4. Electrical/Electronic Equipment Centers Lights
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A. Main and Forward Equipment Centers Lights
(1) Dome light assemblies are mounted in the ceiling of the main equipment center (E1) and in the ceiling of the forward equipment centers (E4 and E5). These lights provide area illumination for servicing and are all controlled by the same two switches. These switches are located at the upper and lower entry hatches of the main equipment center. All the dome lights may be turned on or off by either of these switches. Two of the main equipment center dome lights also function as airplane access lights through the flight compartment access lights relay (Ref 33-13-00).
B. Center Equipment Center Light
(1) A dome light gives lighting for servicing.
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