777 AIRCRAFT MAINTENANCE MANUAL
GALLEY LIGHTS -OPERATION
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GALLEY LIGHTS -FUNCTIONAL DESCRIPTION
Functional Description
Fluorescent galley lights give light to a wide area in a galley. The galley light switch gives a signal to the ballast in the galley light. The ballast makes the fluorescent galley lights come on bright or dim.
Supplemental galley lights give light to a small area in the galley. Some galleys do not have these lights. A ZMU gives control for the supplemental galley lights. The ZMU uses inputs from the supplemental galley light switch and the lamp test to calculate when to turn on or off the lights. Information about the position of the supplemental galley light switch goes through an OEU to the ZMU. Lamp test information comes from the lamp test screen on the cabin system control panel (CSCP) (not shown). When the supplemental galley light switch is set to ON or a test for the supplemental galley lights is on, the ZMU gives an ON command signal to an OEU. The OEU turns on the supplemental galley lights.
See the cabin services system section for more information about ZMUs, OEUs, and the lamp test screen (SECTION 23-39).
Standby (ETOPS) Lights
Some galley fluorescent lights assemblies have a standby light. The standby light gives a low level of light to a galley area when usual lights are not available. A ZMU gives automatic control for the standby lights. The ZMU uses inputs from ELMS about the status of the ground service bus and the lamp test to calculate when to turn on or off the standby light. Information about the ground service bus comes from ELMS through the cabin system management unit (CSMU) and the passenger address/cabin interphone (PA/CI) controller. Lamp test information comes from the lamp test screen on the cabin system control panel (CSCP) (not shown). When the standby bus does not have power, the ZMU gives an ON command signal to an OEU. The OEU turns on the standby light.
Power
Power for the fluorescent lights is 115v ac. It comes from the ground service bus.
The main buses 115v ac secondary 2 must have power for the supplemental galley lights to operate.
The transfer buses 115v ac must have power for the standby light to operate.
See the passenger service system section for more information about power for the OEU (SECTION 23-33).
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777 AIRCRAFT MAINTENANCE MANUAL
GALLEY LIGHTS -FUNCTIONAL DESCRIPTION
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777 AIRCRAFT MAINTENANCE MANUAL
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
PASSENGER CALL LIGHTS -INTRODUCTION
Purpose
The passenger call lights tell the flight attendants when aid is necessary.
Location
There is an attendant call switch and attendant call reset switch on the passenger control unit (PCU) at each seat.
There are two passenger call lights on each center passenger service unit (PSU). There is one on each outboard PSU.
Interface
The passenger call lights give signals to the master call module, the passenger address/cabin interphone (PA/CI) system and the CACP and CSCP screens.
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777 AIRCRAFT MAINTENANCE MANUAL
PASSENGER CALL LIGHTS -INTRODUCTION
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PASSENGER CALL LIGHTS -OPERATION
Operation
The passenger call light comes on when you push the attendant call switch. This causes a blue light on the master call light module to come on.
The call light on the PSU goes out when you push the reset switch. You can use the cabin system control panel (CSCP) or a cabin area control panel (CACP) service call screen to reset all of the passenger call lights in an area.
The light on the master call light module goes out when there are no passenger call lights on in that area.
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777 AIRCRAFT MAINTENANCE MANUAL
PASSENGER CALL LIGHTS -OPERATION
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PASSENGER CALL LIGHTS -FUNCTIONAL DESCRIPTION
Functional Description
The configuration database that is loaded in the cabin services system (CSS) sets the passenger call lights that come on in each selection.
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