(a) Worktable lights provided for the captain and the first officer are located directly above the individual worktables.
(2)
Map
(a) Map lights are provided for the captain, first officer and first observer.
(3)
Utility
(a) Utility lights are provided for the flight crew. Each utility light is connected to a terminal block by a flexible cord so it can be removed from its mount for use.
(4)
An electrical receptacle is also provided for the use of a portable signal light.
B. For more data about this lighting system, refer to these sources:
(1) SSM 33-13-02, 33-15-01
(2) WDM 33-11-61, 33-11-62, 33-13-49, 33-15-11, 33-15-31Worktable Lights
________________
A. The captain and the first officer are each provided with a control for their worktable lights. The worktable light aperture size may be varied by rotating the outside knob on the end of the light assembly.
B. On some airplanes the captain's and first officer's folding side table lights are bracket mounted in the window sill. These lights have a on-off/dimmer control knob installed.
C. The 28-volt ac main bus supplies power to the worktable incandescent
lamps through a circuit breaker on the P6 panel.Map Lights
__________
A. The pilots' map lights are located adjacent to the forward portion of the pilots' overhead panel P5. The map lights are double hinged to their mounting base so the pilots can change the direction of the light pattern as desired. The pilots' map lights have an iris adjustment ring to vary the size of the light pattern. The 28-volt ac bus 4 supplies power to the map lights through a circuit breaker located on the P6 panel. The MAP light controls are on the main instrument lightshield panel P72, and are pull-on, push-off, rotate to dim type.
B. The first observers map light, same as the pilots', is controlled by a
dimmer and switch control on the observers panel.Utility Lights
______________
A. Utility floodlights are provided in the flight compartment, one for each flight crewmember. The utility lights are semiportable. They can be removed from their mounting fixture and used to illuminate areas not possible otherwise. The light assembly is electrically connected to its mount by a flexible cord that extends to approximately 50 inches. Rotation of the front section of the light permits the selection of white or red light. Rotation of the red knob on the light varies its intensity from off to dim through bright. A small pushbutton on the red knob provides maximum intensity light output at any position of knob rotation. Releasing the pushbutton restores the light intensity to that selected by knob rotation.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
B. The 28-volt ac bus 4 supplies power to the utility lights through a circuit breaker located on the P6 panel. The utility lights and the map lights use a common circuit breaker.
5. Miscellaneous Lighting
______________________
A. A remote control display unit (RCDU) is installed in the E/E bay. The RCDU lightplate is illuminated with 5 volts ac from stepdown transformer T1857 in the P415 panel.
B. Instrument nomenclature and switch positions are illuminated by 5 volt ac incandescent lightplate lamps. The lamps are soldered into a circuit board and are not line-replaceable.
C. RCDU lightplate illumination intensity is not controllable. If
lightplate illumination is diminished or non-existant, refer to
33-11-12/201.
D. Incandescent lights are installed in the cabin entry threshold step. Three (3) volts ac power from the step light transformer T1904 is supplied to the light assembly anytime airplane power is applied. Threshold light switching or intensity control is not provided.
6. Portable Signal Light Receptacle
________________________________
A. The portable signal light receptacle is located in the P6 main power distribution panel. The 28-volt ac ground service bus supplies power to the receptacle through a circuit breaker on the P6 panel.
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