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PA SYSTEM - INTERFACES

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The PA amplifier supplies audio to these components and system:

· REU mute relays

· Passenger and lavatory speakers

· Passenger entertainment system.

The REU supplies audio to the attendant speakers.

 

Chimes

 

The PA amplifier supplies chimes for these conditions:

- NO SMOKING/FASTEN SEAT BELTS signs operate - low chime

- Attendant call switch operates - high chime from passenger service units and lavatories, high/low chime from the flight compartment and attendant stations.

 

Gain Control усиление

 

The PA amplifier receives gain signals from the REU. The REU receives inputs from the engine running relays. When the engines operate, the PA amplifier gain increases to compensate for the increase in the ambient noise level. окружающий

 

Power

The PA amplifier gets 28v dc from the battery bus.

Audio

For flight crew and attendant announcements, the PA system receives audio from these sources:

· Flight compartment microphones

· Attendant microphones.

Priority circuits in the PA amplifier receive the audio and PTT inputs and set the priority. The PA amplifier amplifies the audio with the highest priority and sends the audio to the passenger service units and lavatory speakers.

The PA amplifier supplies a side tone through the remote electronics unit (REU) to the flight crew headsets.

Amplified audio goes through the REU mute relays to the attendant speakers.

 


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