Honeywell KMA28 Marker Beacon Operation, Telephone Operation if equipped with approved system

Bendix/King

KMA28

Audio Amplifier/Intercom/Marker Beacon Receiver

Table 3-1 Intercom Modes

Mode

Pilot Hears

Copilot Hears

Passenger Hears

Telephone

Comments

Isolate

A/C Radios

Copilot and passenger

Passenger and Copilot

“Phone Booth” mode

This

mode

allows

the

Pilot Sidetone

intercom

intercom

Pilot

has exclusive use

of

pilot

to

communicate

without the

others

both-

Entertainment #1

Entertainment #2

the telephone.

(during radio transmis-

ered

by

the

conversa-

tions.

Copilot

and

pas-

sion)

In TEL, Pilot

connected

to

sengers can continue to

Entertainment 1

is

Com 1 for PTT TX and re-

communicate

and

listen

ceive.

Muted

to music

All

Pilot

Copilot

Passengers

All have access to phone

This mode allows all on

Copilot

Pilot

Pilot

through

Hook

Switch. Pilot

board to hear radio re-

access through TEL switch.

ception as well as com-

A/C Radio

A/C Radio

Copilot

All hear telephone audio.

municate

on

the

inter-

com. Music and intercom

Passengers

Passengers

A/C Radio

is muted during intercom

Entertainment #1

Entertainment #1

Entertainment #2

and

radio

communica-

tions

Crew

Pilot

Copilot

Passengers

Pilot and copilot don’t have

This

mode

allows

the

Copilot

Pilot

Entertainment #2

phone

access, unless mic

pilot and copilot to con-

sel

in

TEL.

Passengers

centrate

on

flying,

while

A/C Radio

A/C Radio

have

phone through

Hook

the

passengers

can

Switch,

Passengers

hear

communicate

amongst

Entertainment #1

Entertainment #1

phone audio.

themselves.

3.5Marker Beacon Operation

The Marker Beacon Receiver uses visual and audio indicators to alert you when the air- craft passes over a 75 MHz transmitter.

The audio from the Marker Beacon Receiver can be heard by selecting the "MKR" push- button switch.

A three-position switch is used to set the receiver sensitivity and to test the indicator lamps. Use "HIGH" sensitivity initially. This allows you to hear the outer marker beacon about a mile out. Then select the “LOW” sensitivity to give you a more accurate location of the Marker. When used only for approach markers, many pilots choose to leave the switch in the low sensitivity position.

The momentary down switch position is labeled "T/M" (Test/Mute) and illuminates all three lamps simultaneously to assure they are in working order.

The “T/M” position is also a Marker Beacon “Mute” function. Pushing this switch while receiving a marker beacon signal will cause the audio to be temporarily silenced. No ac- tion is required to restore the audio in time for the next beacon.

3.6Telephone Operation (if equipped with approved system)

Each intercom position has a "hook switch." The pilot's hook switch is the "TEL" mode on the mic selector, the others are individual switches mounted adjacent to the headset jacks.

006-10565-0000 3-7 Rev. 0, Sept. 00