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System Operation

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The PA system audio inputs come from these sources:

· Tape reproducer

· Flight compartment microphone

· Attendant handsets.

 

The PA amplifier selects the highest priority input. The amplifier amplifies the audio signal and sends it to these LRUs and systems:

· REU

· Passenger entertainment system

· Cabin speakers

· Lavatory speakers.

 

The amplified audio goes from the PA amplifier to the cabin and lavatory speakers. The audio also goes through muting circuits in the REU to the FWD and AFT attendant speakers. The on-side attendant speakers are muted during attendant announcements (немой,бесшумный) to prevent feedback.

The PA audio goes through the REU to the flight crew headsets as sidetone. It also goes to the flight compartment speakers.

The PA amplifier sets the priority of the input signal. These are the PA system audio priorities:

· Priority 1 - announcement from the flight compartment

· Priority 2 - announcement from an attendant

· Priority 3 - pre-recorded announcement

· Priority 4 - boarding music.

 

The lavatories and passenger service units send discrete signals to the PA amplifier to make chime signals.

The PA amplifier supplies a chime signal when the flight crew puts the passenger signs panel NO SMOKING or FASTEN BELTS switches in the ON position or pushes the ATTEND switch.

The chime signals are superimposed on the other PA audio in the amplifier. накладываться

 

 


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