*
Lav toggle.
In the lav steady configuration, the lavatory side of the lights will always be on when the ZMU and OEU have power.
In the lav toggle configuration, when the occupied side of the light turns on, the lavatory side of the light turns off.
See the waste tank quantity indication section for more information about waste tank quantity indication (SECTION 38-33).
See the cabin services system section for more information about the OEU (SECTION 23-39).
Power
The transfer buses must have power for the lavatory occupied lights to operate.
See the passenger service system section for more information about the power for the OEU (SECTION 23-33).
Training Information Point
You can use the CSS configuration database to change the lavatory occupied lights to either the lav steady or lav toggle configuration.
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LAVATORY LIGHTS AND SIGNS -PASSENGER AREA SIGNS -FUNCTIONAL DESCRIPTION
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LAVATORY LIGHTS AND SIGNS -FLIGHT DECK SIGN -FUNCTIONAL DESCRIPTION
Functional Description
The ZMU sends a signal to the OEU when all the forward lavatories are occupied. The OEU closes a switch that makes the flight deck lavatory occupied relay energize. This makes the lavatory occupied light in the flight deck come on.
The master dim and test module makes the light come on in the bright or dim mode.
See the cabin services system section for more information about the OEU (SECTION 23-39).
Power
The power for the light comes from the right main bus. The master dim and test module makes the light come on in the bright or dim mode.
The transfer buses must have power for the relay to operate.
See the passenger service system section for more information about the power for the OEU (SECTION 23-33).
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LAVATORY LIGHTS AND SIGNS -FLIGHT DECK SIGN -FUNCTIONAL DESCRIPTION
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777 AIRCRAFT MAINTENANCE MANUAL
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
GALLEY LIGHTS -INTRODUCTION
Purpose
The galley lights give light in the galleys.
Physical Description
These are the galley lights:
*
Main galley lights
*
Supplemental galley lights
*
Standby lights. The main galley lights are fluorescent lights. They have a lens.
The standby light has an incandescent lamp. The lamp is a bayonet-style lamp. The standby light is in the main galley light.
A supplemental galley light has these parts:
*
Slot (4)
*
Bezel/lens retainer
*
Lens
*
Tab (4)
*
Lamp
* Lever. You use the lever to lock the light in position. Location
The the main and supplemental lights are in the ceiling in the galleys. The main galley lights have standby lights with them.
Training Information Point
To replace the main galley lights you use the fasteners in the corners of the lens to remove the lens and bezel. They are one part. This gives you access to the fluorescent lights.
You use the quick releases to remove the fluorescent lights.
You lower the ceiling panel to get access to the ballast.
To replace a supplemental light you:
*
Compress the lens/bezel retainer
*
Turn it counterclockwise to disconnect it from the slots
*
Replace the lamp.
You do the opposite procedure to install the bezel/lens retainer.
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777 AIRCRAFT MAINTENANCE MANUAL
GALLEY LIGHTS -INTRODUCTION
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GALLEY LIGHTS -OPERATION
Operation
You use the area light switch to make the main galley lights come on in the dim or bright mode.
You use the attendant light switch to operate the supplemental lights.
The standby lights come on when the transfer buses have power and the ground service bus does not have power.
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