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Pushes an attendant call switch (not shown)
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Calls an attendant station (not shown).
Location
There is a lavatory call switch in each lavatory and a lavatory call reset switch above the door on the external wall of the lavatory.
The master call light modules are on some exit signs.
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LAVATORY CALL LIGHTS AND MASTER CALL LIGHT MODULES -INTRODUCTION
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LAVATORY CALL LIGHTS AND MASTER CALL LIGHT MODULES -LAVATORY CALL LIGHTS
Purpose
The lavatory call switch lets someone in the lavatory call an attendant. The lavatory call reset switch lets the attendants reset the lavatory call lights system.
Physical Description
The lavatory call switch and lavatory call reset switch have amber lenses and have lights in them.
Location
There is a lavatory call switch in each lavatory and a lavatory call reset switch above the door on the external wall of the lavatory.
Operation
An amber light in the lavatory call switch comes on when you push it. This also causes an amber master call light and the amber light in the lavatory reset switch to come on.
The three lights go off when you push the lavatory call reset switch.
The lights also go off when they are reset on the cabin system control panel (CSCP) or the cabin area control panel (CACP) service call screen. The CSCP and CACP are part of the cabin services system.
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LAVATORY CALL LIGHTS AND MASTER CALL LIGHT MODULES -LAVATORY CALL LIGHTS
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LAVATORY CALL LIGHTS AND MASTER CALL LIGHT MODULES -MASTER CALL LIGHT MODULE
Purpose
The master call light module tells the flight attendants when a passenger or flight crew member needs aid.
Location
The modules are on the ceiling near:
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Doors 1R and 1L
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Doors 2R and 2L
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Doors 3R and 3L
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Doors 4R and 4L
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Aft galley area.
Physical Description
The lights are incandescent.
There are lens covers for the lights. The lens covers are blue, amber, pink, or opaque.
Indications
The light under the blue cover comes on when a passenger pushes the passenger call switch on the seat.
The light under the amber cover comes on when someone pushes the lavatory call switch in a lavatory.
The light under the pink cover comes on when someone uses the passenger services system to call an attendant station in that area. The opaque cover is used when a blue, pink, or amber cover is not used.
Training Information Point
You can put the lens covers in different sequences.
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LAVATORY CALL LIGHTS AND MASTER CALL LIGHT MODULES -MASTER CALL LIGHT MODULE
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LAVATORY CALL LIGHTS AND MASTER CALL LIGHT MODULES -FUNCTIONAL DESCRIPTION
Functional Description
When you push the lavatory call switch a signal goes to the cabin services system (CSS). The ZMU in the CSS has the logic to turn on and reset the lavatory calls. The OEU gets information from the ZMU to turn on and reset the lavatory calls.
The ZMU sets a latch that makes a light come on under the amber cover on the master call light module.
The OEU sets a latch that closes a switch. This makes the amber lavatory call and call reset switch lights come on.
The CSS also turns on these indications:
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Chime in the passenger cabin
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Active call on the CSCP/CACP service call screen.
When you push the lavatory call reset switch, the signals go the same way as the call signal. This causes the lavatory call and reset call lights to go off.
You reset all the lavatory calls in an area when you touch the AREA RESET on the service call screen on CSCP or the CACP.
The master call light goes off when the last call that is active in the defined area is reset.
See the cabin services system section for more information on the CACP, intersystem, and panel buses (SECTION 23-39).
Power
The transfer buses must have power for the lavatory call lights to operate.
The master call light module gets power from the right main bus.
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