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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 option.
The passenger attention LOW-chime broadcast through
the passenger and cabin attendant station loudspeakers
will be initiated only when the FASTEN SEAT BELT or
the NO SMOKING signs are switched ON.
Automatic FASTEN SEAT BELT (FSB) signs control at
landing gear down and locked option.
The FSB signs in the passenger compartment and the
RETURN TO SEAT signs in lavatories will come on if the
FSB 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 option.
The FSB signs in the passenger compartment and the
RETURN TO SEAT signs in lavatories will come on if the
FSB 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 option.
The NS signs in the passenger compartment will come
on if the NS switch in the flight compartment is in
the AUTO position and the slats and flaps are
activated.
Combined "NS/SEAT ROW NUMBERING" signs option.
A combined NS and SEAT ROW NUMBERING sign will be
installed in each PSU.
The additional NS signs are activated in parallel to
the basic signs provided in the PSUs.
"NO ELECTRONIC DEVICE" signs option.
At customer request, the "NO SMOKING" signs can be
replaced by the "NO ELECTRONIC DEVICE" signs.
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23 - COMMUNICATIONS
23-73-00 PRERECORDED ANNOUNCEMENT & BGM
D/O
CONTENTS:
General
Prerecorded Announcements
Boarding Music (BGM)
Prerecorded Announcements and BGM Operation
Options
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PRERECORDED ANNOUNCEMENT & BGM D/O
GENERAL
The function of the Prerecorded Announcement and
Boarding Music (PRAM) Reproducer is to play prerecorded
messages. It also plays boarding music programs on a
cassette tape to the passengers through the aircraft
passenger address system. The PRAM is controlled by
the audio module, which is a part of the FWD ATTND
Panel. It is installed in the cabin at the forward
attendant station. The PRAM and the audio module are
connected with two ARINC 429 data buses through the
Cabin Intercommunication Data System (CIDS) active
director to receive and transmit control data.
The Prerecorded Announcement and Boarding Music (PRAM)
Reproducer is installed in the aft avionics
compartment.
PRERECORDED ANNOUNCEMENTS
The Prerecorded Announcement Reproducer (PRAM) has two
cassette decks.
Up to 256 prerecorded announcements are stored on two
tapes in the prerecorded announcement reproducer (each
minimum 30 s). The PRAM has the capability to produce
an emergency announcement in the event of a rapid cabin
decompression. An emergency announcement is stored in
a Solid State Stored Voice (SSSV). A ground signal
from a rapid decompression, triggers, through relay
19WR, the emergency announcement.
All functions are remotely controlled from the audio
module in the FWD ATTND Panel (FAP) (except the output
level of normal and emergency announcements). They are
adjustable at the front of the reproducer.
The prerecorded announcements can be controlled from
the audio module in the FAP.
BOARDING MUSIC (BGM)
There are two sources for the BGM: the PRAM and the
Passenger Entertainment Audio Reproducer.
The choice of the BGM channels is established by each
customer.
In the PRAM there are two cassette decks for the BGM.
　
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