PASSENGER LIGHT SYSTEM

GENERAL
No Smoking (NS) signs on is achieved by a 3-position switch (ON/AUTO/OFF) in the flight compartment for NS and EXIT signs in the passenger compartment. Fasten Seat Belt (FSB) and return to seat signs on is
achieved by a 2-position switch (ON/OFF) in the flight compartment for FSB signs in the passenger compartment and the return to seat signs in the lavatories. A class divider will be installed in the cabin when more than one cabin zone is adopted.
NS AND EXIT SIGNS
MANUAL MODE
In manual mode, the 3-position switch installed in the flight compartment can be set in the ON/OFF position for activation/deactivation of the NS and EXIT signs. Visual indication: the NS at the seat rows and the EXIT signs are switched on/off. Aural indication: one low chime is broadcast via all passenger and all attendant (ATTND) loudspeakers when the signs are switched on/off.
AUTOMATIC MODE
For the automatic mode, the 3-position switch installed in the flight compartment has to be set in the AUTO position. When the landing gear is down and locked the NS and EXIT signs are switched on. The visual and aural indications are the same as in the manual mode.
FSB AND RETURN TO SEAT SIGNS
MANUAL MODE
The2-position switch installed in the flight compartment can be set in the ON/OFF position for activation/deactivation of the FSB and return to seat signs. Visual indication: the FSB signs at the seat rows and the return to seat signs at the lavatories are switched on/off. Aural indication: One low chime is broadcast via all cabin and all ATTND loudspeakers when the signs are switched on/off.
AUTOMATIC MODE
There is no automatic mode in the basic version.

EXCESSIVE ALTITUDE
In case of excessive altitude the FSB, return to seat, NS and the EXIT signs switch on automatically.
OPTIONS
The following options can be embodied upon customer request:
– flashing mode of passenger light signs,
– chime activation at signs “ON” operation only,
– automatic FSB signs control at landing gear down and locked,
– automatic FSB signs control when slats and flaps are activated,
– automatic NS signs control when slats and flaps are activated,
– combined NS/seat row numbering signs.
Any of these options, once adopted, will be integrated in the Cabin Assignment Module (CAM).
FLASHING MODE OF PASSENGER LIGHTED SIGNS
The FSB and NS will flash for approximately five seconds, when the related switches in the flight compartment are set to the ON position. After expiration of this time period the signs will remain on and steady until they are switched off.
CHIME ACTIVATION AT SIGNS ON OPERATION ONLY
The passenger attention low-chime broadcast through the passenger and cabin attendant station loudspeakers will be initiated only when the SEAT BELTS or the NO SMOKING signs are switched on.

AUTOMATIC FSB SIGNS CONTROL AT LANDING GEAR DOWN AND LOCKED
The FSB signs in the passenger compartment and the return to seat signs in lavatories will come on if the SEAT BELTS switch in the flight compartment is in the auto position and the landing gear is down locked.
AUTOMATIC FSB SIGNS CONTROL WHEN SLATS AND FLAPS ARE ACTIVATED
The FSB signs in the passenger compartment and the return to seat signs in lavatories will come on if the SEAT BELTS switch in the flight compartment is in AUTO position and the slats and flaps are activated.
AUTOMATIC NS SIGNS CONTROL WHEN THE SLATS AND FLAPS ARE ACTIVATED
The NS signs in the passenger compartment will come on if the NO SMOKING switch in the flight compartment is in the AUTO position and the slats and flaps are activated.
COMBINED NS/SEAT ROW NUMBERING SIGNS
A combined NS and seat row numbering sign will be installed in each Passenger Service Unit (PSU). The additional NS signs are activated in parallel to the basic signs installed on the PSUs.
NO ELECTRONIC DEVICE SIGNS
At customer request, the NS signs can be replaced by the no electronic device signs.


Credit : Alvi Mark
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