*
Floodlights.

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FLIGHT COMPARTMENT ILLUMINATION -INTRODUCTION

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FLIGHT COMPARTMENT ILLUMINATION -DOME LIGHTS -INTRODUCTION

Location
There are two dome lights, one is above the captain’s seat and the other is above the first officer’s seat.
Physical Description
Each light has these components:
*
Lamp

*
Lens

*
Grille.

The captain’s dome light has two lamps. One is the normal lamp and the other is the lamp for the emergency light system.
See the emergency lights section for more information about the emergency lights (SECTION 33-50).
Training Information Point
To get access to the lamp you pull down on the grate and remove the lens. The lens has a bayonet-style mount. The lamp is a bayonet-style lamp.
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FLIGHT COMPARTMENT ILLUMINATION -DOME LIGHTS -INTRODUCTION

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FLIGHT COMPARTMENT ILLUMINATION -DOME LIGHTS -OPERATION

Operation
You use the dome light control (DOME) to operate the dome lights. The control is on the passenger signs/lighting panel on the P5 overhead panel. The control is a rotary-type control that controls the intensity of the lights.
You use the storm light switch (STORM) to make the dome and floodlights come on fully bright. It will also make the lights in the master dim and test system operate at the fully bright level.
See the master dim and test section for more information about the master dim and test system (SECTION 33-16).
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FLIGHT COMPARTMENT ILLUMINATION -DOME LIGHTS -OPERATION

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777 AIRCRAFT MAINTENANCE MANUAL

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FLIGHT COMPARTMENT ILLUMINATION -DOME LIGHTS -FUNCTIONAL DESCRIPTION

General
The dome lights have four modes of operation:
*
Normal

*
Backup

*
Standby

*
Storm.

In the normal and backup modes the amount of light that comes from the light is adjustable. In the standby mode the amount of light is not adjustable. In the storm mode the lights come on fully bright.
Normal Mode
When the ground service bus has power, the dome lights dimmer relay energizes. This supplies power to the dimmer on the passenger signs/lighting panel on the P5. It also energizes the standby lights relay.
When the standby lights relay is energized and the control is not in the OFF position, power from the ground service bus goes to the lights and makes them come on. When you adjust the control it adjusts the variable transformer in the dimmer. This adjusts the amount of light that comes from the dome lights.
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Backup Mode
If the ground service bus does not have power and the right transfer bus has power, the dome lights operate in the backup mode. In the backup mode the dome lights operate the same as in the normal mode. The only difference is that the right transfer bus supplies power to the dome lights dimmer and the standby lights relay. The dome lights dimmer relay is de-energized to the backup position.
Standby Mode
If the ground service bus and the right transfer bus do not have power, the standby lights relay is de-energized to the standby position. Power from the standby power system goes to the captains flight instrument bus. It then goes through the standby dome lights resistor to decrease the voltage. The dome lights come on, but they are not at the fully bright level.
Storm Mode
When you push the storm light switch (STORM), the storm lights relay energizes. It energizes in every mode of operation because its power comes from the standby power system. When the relay energizes, 28v dc goes to the lights and they come on fully bright.
Training Information Point
The emergency lighting system turns on the second captain’s dome light.
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FLIGHT COMPARTMENT ILLUMINATION -DOME LIGHTS -FUNCTIONAL DESCRIPTION
See the emergency lighting section for more information (SECTION 33-50).
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