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 C.  Primary lighting power used is 115 volts ac. Step-down transformers and transformer rectifier units supply the various levels of ac and dc voltages required by specific lighting groups. Panel-mounted circuit breakers protect individual lighting circuits. Lighting controls are conveniently located throughout the airplane and vary in complexity from simple toggle switches to logic circuitry.
 D.  Airplane lighting consists of:
 (1)  
Flight Compartment Lighting (33-10-00)

 (a)  Flight compartment lighting illuminates the control cabin work areas and control panels. A master dim and test system for testing annunciators is provided.

 (2)  
Passenger Compartment Lighting (33-20-00)

 (a)  Passenger compartment lights give lighting to each seat, aisle, entry, lavatory, galley, and crew rest. Each call light and information sign gives messages to the flight crew and the passengers.

 (3)  
Cargo and Service Compartment Lighting (33-30-00)

 (a)  Cargo and service compartment lights illuminate maintenance and cargo loading areas during ground operations.

 (4)  
Exterior Lighting (33-40-00)

 (a)  Exterior lights illuminate the airplane and landing area during flight operations. They illuminate the runway and taxi areas during ground operations.
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747-400
MAINTENANCE MANUAL

 (5)  Emergency Lighting (33-50-00)
 (a)  Each interior and exterior emergency light gives lighting to the escape paths. There are lights for the aisles and exits and their associated areas.
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747-400 MAINTENANCE MANUAL
 FLIGHT COMPARTMENT LIGHTING - DESCRIPTION AND OPERATION
_______________________________________________________
 1.  General_______
 A.  Flight compartment lighting consists of instrument panel and compartment area illumination.
 B.  Lighting control panels at each crewmembers station and overhead panel P5 provide lighting on/off switching and dimming control.
 C.  Flight compartment lighting is divided into four sections:
 (1)  
Instrument Panel Lights (33-11-00)

 (a)  The instruments, switch/lights and systems control panels contain integral incandescent lights. Glareshield and control stand panels are provided with external flood lighting for illumination. The lights illuminate dials, control panel lettering and switch position lettering.

 (2)  
Master Dim and Test (33-12-00)

 (a)  A master dim and test system allows the pilot to test indicator lights in the flight compartment, or to select one of two predetermined indicator light intensity levels.

 (3)  
Flight Compartment Illumination (33-13-00)

 (a)  Flight compartment illumination is provided by incandescent dome lights in the ceiling panels, flight deck access lights and panel flood lights.

 (4)  
Flight Compartment Auxiliary Lights (33-15-00)

 (a)  Area lights such as map, chart, and flight kit/utility lights are provided.
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 1.

2.

3.

A
747-400 MAINTENANCE MANUAL
 PILOTS' PANEL LIGHTS - DESCRIPTION AND OPERATION
________________________________________________
General
_______
 A.  The pilots panels are externally illuminated by floodlights and integrally illuminated by lightplates, instrument lights, and lighted pushbutton switches.
　
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