AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
REVISION 17
2-18-27
Page
1
Code
01
PASSENGER ADDRESS SYSTEM
The Passenger Address System (PAS) provides communication
between cockpit and flight attendants, and announcements from
cockpit or flight attendants to the passenger cabin.
The PAS also interfaces with the audio entertainment and prerecorded
announcement systems to provide music and safety briefing/flight
information through the passenger loudspeakers.
The following functions are available through the PAS:
− Voice announcement transmission (speech) to the PAX cabin.
− Call function from captain, copilot and observer to flight attendant
and vice-versa through chime tone.
− Call function from passenger to attendant, through chime tone.
− Chime tone for NO SMOKING and FASTEN SEAT BELTS signals.
− Interface to boarding music and passenger briefing.
The PAS component responsible for sending/receiving signals to/from
cockpit, attendant handsets, and for passenger entertainment and
prerecorded announcement systems is the Passenger Address
Amplifier (PAA), located in the airplane electronic compartment.
The PAA establishes the priority among the input signals from the
several sources and then drives these signals to the proper cabin
loudspeakers. The PAA also provides the logic for generation of the
aural and visual annunciators, chimes for attendant, passenger and
cockpit calls, and for NO SMOKING and FASTEN SEAT BELTS
signals.
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