(2)
Three dome lights provide general flight compartment illumination. The captain and first officer have one dome light each above their flight station. A third dome light illuminates the aft area of the flight compartment.
B. For more data about this lighting system, refer to these sources:
(1) SSM 33-13-01 thru 33-13-99
(2) WDM 33-13-11 thru 33-13-99Flight Compartment Access Lights
________________________________
A. Access paths to the flight compartment from either the crew service door, the No. 1 main entry door, or the main E/E equipment center external access door are illuminated. The lamps used are located as follows: two upper deck ceiling lights, two ceiling lights above the ladder, two main deck entry door lamps, and two main equipment center dome lights. The five access light switches are located at the three key points of entry, the upper deck attendants panel, and in the flight compartment.
B. The access path illumination lamps are selected from other systems. They are switched to the access light circuit by operating any of the three access light switches. The access lights relay located in the main power center-left P414, when energized by one of the switches, will transfer the lights from their normal system circuit to a common access light circuit. The 28-volt dc ground handling bus provides power.
Flight Compartment Dome Lights
______________________________
A. The dome lights located directly above the captain, first officer and the aft dome light are controlled by a single variable dimmer transformer on the pilots' P5 overhead panel. The 28-volt ac ground service bus supplies power to the flight compartment dome lights through the energized state of the dome lights relay.
B. Clockwise rotation of the DOME lights control knob on the P5 panel will increase the dome light intensity as the knob rotates.
C. The STORM switch energizes the storm lights relay connecting the pilots' dome lights to the 28-volt dc main battery bus and overriding the light dimmer control.
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A
747-400 FAULT ISOLATION/MAINT MANUAL
FLIGHT COMPARTMENT ILLUMINATION
* SEE THE SSM OR WDM FOR THE EQUIPMENT NUMBER, QUANTITY AND LOCATION OF EACH COMPONENT IN THE LIGHTING CIRCUIT.
Flight Compartment Illumination - Component Index
Figure 101
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E47333
A
747-400
FAULT ISOLATION/MAINT MANUAL
FLIGHT
COMPARTMENT
ACCESS
LIGHT SWITCH
.
SEE A
.
MAIN P414
EQUIPMENT CENTER LIGHTS
MAIN EQUIPMENT CENTER
LIGHT SWITCH
FOR FLIGHT
COMPARTMENT
ACCESS
LIGHT SW SEE B
DOME LIGHTS FLT DECK
LIGHT SWITCH ACCESS
FOR DOME LIGHT
SEE C
A
B
P6 PANEL
FLIGHT COMPARTMENT
Flight Compartment Illumination - Component Location Figure 102
E47464
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
FLIGHT COMPARTMENT ILLUMINATION LIGHTS - ADJUSTMENT/TEST
________________________________________________________
1. General_______
A. This procedure contains two tasks. The first task is an operational test test of the access lights.
B. The second task is an operational test of the dome lights in the flight compartment.
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