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PS Engineering

PMA7000B Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-780-0005 Page 3-6 Rev. 11, February 2015

Table 3-2 Intercom Modes

Mode

Pilot Hears

Copilot Hears

Passenger Hears

Telephone

Comments

Isolate

A/C Radios

Pilot Sidetone

(during radio transmis-

sion)

Entertainment 1 is

Muted

Copilot and passenger

intercom

Entertainment #1

Passenger and Copilot

intercom

Entertainment #2

“Phone Booth” mode

Pilot has exclusive use of

the telephone.

In TEL, Pilot & Copilot con-

nected to Com 1 for PTT TX

and receive. Others hear Tel

if off hook.

This mode allows the

pilot to communicate

without the others both-

ered by the conversa-

tions. Copilot and pas-

sengers can continue to

communicate and listen

to music

All

Pilot

Copilot

A/C Radio

Passengers

Entertainment #1

Copilot

Pilot

A/C Radio

Passengers

Entertainment #1

Passengers

Pilot

Copilot

A/C Radio

Entertainment #2

All have access to phone

through Hook Switch. Pilot

access through TEL switch.

All hear telephone audio if

off hook.

This mode allows all on

board to hear radio re-

ception as well as com-

municate on the inter-

com. Music and intercom

is muted during intercom

and radio communica-

tions

Crew

Pilot

Copilot

A/C Radio

Entertainment #1

Copilot

Pilot

A/C Radio

Entertainment #1

Passengers

Entertainment #2

Pilot and copilot don’t have

phone access, unless mic

sel in TEL. Passengers

have phone through Hook

Switch, Passengers hear

phone audio.

This mode allows the

pilot and copilot to con-

centrate on flying, while

the passengers can

communicate amongst

themselves.

3.7 Telephone Mode

The Com 3 mode can serve as a full duplex interface for telephone systems such as AirCell or portable cel-

lular phones with earpiece jacks, if the installation is correctly configured. When interfaced with an ap-

proved airborne telecommunications system, the PMA7000B can serve as a audio control and distribution

center. Each intercom position has a "hook switch." The pilot's hook switch is the "Com 3" button on the

audio panel, the others are discrete switches mounted adjacent to the headset jacks. When Com 3 is active

in the duplex mode, the TX button will blink about twice as fast as the normal transmit rate.

When the intercom is in ALL mode, the pilot can speak on the phone only if the Com 3 is selected for

transmit (Com 3 Xmt button activated). If any passenger places his or her switch into the “off-hook”

position all passengers will also be heard on the phone. All will hear selected audio. Com 1 audio is auto-

matically heard in the headsets. The pilot and copilot will have transmit capability on the other selected

transceiver Com 1 or 2, simply by using their respective PTT switch.

In CREW mode, the pilot and copilot are may use the telephone, with their respective hook switch (the

pilot selects Com 3 on the Xmt selector). Any passenger who places their switch into the off-hook position

will also have access to the phone, and all four passengers will hear the conversation.

In ISO intercom mode, when the PMA7000B is in the Com 3 mode, the pilot position is in the "Phone

Booth." Only the pilot will hear the telephone, and only he will be heard. He will also have access to Com 1

or 2, and will transmit on that radio using the PTT. All selected audio is provided. If any other passenger

goes “off hook” they will hear the phone.

Note: Because the cellphone uses an intercom circuit, all stations on that circuit will lose

intercom capability when the cellphone is in use.

3.8 Marker Beacon Operation (If present)

The optional Marker Beacon Receiver uses visual and audio indicators to alert you when the aircraft passes

over a 75 MHz transmitter.

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