Telephone Mode; Marker Beacon Operation - Honeywell KMA 28B System Installation And Operation Manual

Table 3-2 Intercom Modes
Mode Pilot Hears
Isolate A/C Radios
Pilot Sidetone
(during radio transmis-
sion)
Entertainment 1 is
Muted
All Pilot
Copilot
A/C Radio
Passengers
Entertainment #1
Crew Pilot
Copilot
A/C Radio
Entertainment #1
3.7

Telephone Mode

The Com 3 mode can serve as a full duplex interface for telephone systems such as AirCell or portable
cellular phones with earpiece jacks, if the installation is correctly configured. When interfaced with an
approved airborne telecommunications system, the KMA 28B 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 posi-
tion will also have access to the phone, and all four passengers will hear the conversation.
In ISO intercom mode, when the KMA 28B 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 passen-
ger goes "off hook" they will hear the phone.
Note: Because the cell phone uses an intercom circuit, all stations on that circuit will lose in-
3.8

Marker Beacon Operation

The optional Marker Beacon Receiver uses visual and audio indicators to alert you when the aircraft
passes over a 75 MHz transmitter.
The Blue lamp, labeled "O," is the Outer Marker lamp and has an associated 400 Hertz 'dash' tone. The
lamp and tone will be keyed at a rate of two tones/flashes per second when the aircraft is in the range of
the Outer Marker Beacon.
D201106000060
KMA 28B Audio Selector Panel and Intercom System
Installation and Operator's Manual
Copilot Hears Passenger Hears
Copilot and passenger Passenger and Copilot
intercom intercom
Entertainment #1 Entertainment #2
Copilot Passengers
Pilot Pilot
A/C Radio Copilot
Passengers A/C Radio
Entertainment #1 Entertainment #2
Copilot Passengers
Pilot Entertainment #2
A/C Radio
Entertainment #1
tercom capability when the cell phone is in use.
Bendix/King
Telephone
"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.
All have access to phone
through Hook Switch. Pilot
access through TEL switch.
All hear telephone audio if off
hook.
Pilot and copilot don't have
phone access, unless mic sel
in TEL. Passengers have
phone through Hook Switch,
Passengers hear phone au-
dio.
Page 3-6
Comments
This mode allows the pilot
to communicate without
the others bothered by the
conversations. Copilot and
passengers can continue
to communicate and listen
to music
This mode allows all on
board to hear radio recep-
tion as well as communi-
cate on the intercom.
Music and intercom is
muted during intercom
and radio communications
This mode allows the pilot
and copilot to concentrate
on flying, while the pas-
sengers can communicate
amongst themselves.
June 2011