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 B.  Floodlight, lightplate, instrument light, and lighted pushbutton switch light intensities are adjustable by use of dimming controls convenient to each pilot.
 C.  When pilots' panel flood lights, integral lights, and lighted push button switches are operating from standby power, selected lights will illuminate. This is for load shedding. The dimmers are also controlled by a fixed resistance switched in by standby power controlled relays which sets light intensity to a predetermined level.
 D.  For more data about this lighting system, refer to these sources:
 (1) SSM 33-11-01 thru 33-11-99
 (2) WDM 33-11-11 thru 33-11-99Pilots' Panel Floodlights
_________________________
 A.  White variable intensity floodlighting is provided for the main instrument panel, glareshield, and control stand panel with normal electrical power applied.
 B.  A 115 volt ac bus supplies electrical power to the instrument panel and glareshield floodlight dimmer units. Remote dimmer controls for the instrument panel floodlights are located on the P72 lightshield panel left (pilot) and right (first officer). A dimmer control for the glareshield floodlight is located on the P5 overhead panel.
 C.  A 28 volt dc bus supplies electrical power to one floodlight used for P8 control stand illumination. The P8 control stand light and dimmer control are both located on the P5 overhead panel.
Pilots' Panel Integral Lights
_____________________________
 A.  Concentric light adjustment controls are provided for instrument panel and floodlight illumination. This arrangement provides area light control capability for either or both of the instrument/lightplates or floodlight light intensity levels.
 B.  For information on the lightplate on the remote control display unit (RCDU) located in the E/E bay, refer to 33-15-00/001.
 C.  Main instrument panel area illumination controls are located on each side of the P72 panel. Overhead panel circuit breaker and module instrument lightplate illumination is provided by a single control on the P5 overhead panel. The glareshield and aisle stand panel instrument and flood illumination is adjustable by concentric controls located on the P5 overhead panel.
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MAINTENANCE MANUAL

 D.  Instrument nomenclature and switch positions are illuminated by 5-volt ac incandescent lamps. The lamps are soldered onto the circuit board and are not replaceable on the airplane.
 (1)  Nomenclature on the flight compartment circuit breaker panels is on illuminated acrylic lightplates.
 E.  For maintainability, the 5-volt ac instrument dial lights are considered physically part of the instruments in which they are located.
 F.  115-volt ac buses provide electrical power to resistance controlled dimmer transformers. If instrument lights are operating from normal airplane electrical power, the light dimmers will be controlled by remote adjustable potentiometers for desired light intensities.
 G.  Each dimmer unit is provided with integral circuit breakers for secondary circuit protection.
 (1)  
The captain's and the first officer's main instrument panel dimmer controls are dual units. Each dimmer control has a dual knob and concentric shafts that control separate dimmer circuits. Both shafts are connected to potentiometers.

 (2)  
The center shaft potentiometer controls a remote dimmer transformer circuit that transforms 115-volt ac input to 0- to 5-volt ac output for use on the pilots main panel instruments and lightplates The first officer has a duplicate control for instruments and lightplates on his main panels.

 (3)  
The outer shaft potentiometer controls a remote dimmer transformer circuit used to adjust pilot of first officer instrument panel floodlight intensity levels.

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 ALL  ú ú 01 Page 2 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 4.  Lighted Pushbutton Switches
　
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