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Passenger address/cabin interphone (PA/CI) (not shown)
*
Cabin system management unit (CSMU) (not shown)
*
Cabin area control panel (CACP) (not shown).
The OEU sets a latch that closes a switch. This makes the passenger call lights come on.
The PA/CI sends a signal to a speaker drive module (SDM) to make the high chime sound.
The CSMU sends a signal to the cabin system control panel (CSCP). The CACPs and CSCP display the information on the service call screen.
When you push the attendant call reset switch, the passenger call light goes off. You reset all the passenger calls in an area when you touch the AREA RESET on the CSCP or the CACP service call screen.
The master call light goes out when there are no passenger call lights on in the area.
Power
The main buses must have power for the passenger call lights to operate. The master call light module gets power from the right main bus.
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 configuration database to change the chime.
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PASSENGER CALL LIGHTS -FUNCTIONAL DESCRIPTION
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777 AIRCRAFT MAINTENANCE MANUAL
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33-31-00
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SERVICE AND CARGO LOADING LIGHTS -INTRODUCTION
Purpose
The service and cargo loading lights give light to aid maintenance personnel and the ground crew.
Location
There are service lights in these areas:
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Forward equipment center
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Nose gear wheel well
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Main equipment center
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Environmental control system (ECS) bay
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Main gear wheel wells
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Stabilizer compartments
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APU compartment.
There are cargo loading lights on the external side of the airplane in these areas:
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Forward cargo compartment
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Aft cargo compartment
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Bulk cargo compartment.
There are also lights on the inside of the cargo doors that give light to the door area when the door is open (not shown).
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SERVICE AND CARGO LOADING LIGHTS -INTRODUCTION
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SERVICE AND CARGO LOADING LIGHTS -SERVICE LIGHTS -PHYSICAL DESCRIPTION
Purpose
The service lights give light in the service compartments to help maintenance personnel.
Physical Description
Each light has a:
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Housing
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Fastener (2)
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Lamp
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Bezel
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Captive screw (2)
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Lanyard.
Two fasteners hold the light assembly. Two captive screws hold the bezel.
Training Information Point
To replace the lamp you loosen the two captive screws in the bezel. The bezel will hang by a lanyard. The lamp is a bayonet-style lamp.
All of the service lights are the same.
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SERVICE AND CARGO LOADING LIGHTS -SERVICE LIGHTS -PHYSICAL DESCRIPTION
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SERVICE AND CARGO LOADING LIGHTS -EQUIPMENT CENTER LOCATIONS
Forward Equipment Center
There are six lights in the forward equipment center.
There are two FWD E/E BAY LTS switches that control the lights in the forward equipment center. One is in the forward equipment center, forward of the access door. It is adjacent to the cabin interphone jack. The other switch is in the main equipment center (MEC). It is above the MEC door.
Main Equipment Center
There are ten lights on the ceiling of the MEC.
There are three light switches that control the lights in the MEC:
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GND E/E BAY LTS
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FLT E/E BAY LTS
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