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Section I GENERAL INFORMATION
1.1
INTRODUCTION
The KMA 28B is manufactured exclusively for Honeywell International by PS Engineering, Incorporated.
The detail part numbers in this manual are PS Engineering part numbers.
Before installing and/or using this product, please read this manual completely. This will ensure that you
will take full advantage of all the advanced features in the KMA 28B.
1.2
SCOPE
This manual provides detailed installation and operation instructions for the Honeywell KMA 28B-series
of Audio Selector Panel/Intercom Systems. This includes the following units:
Model
Description
KMA 28B
Stereo Audio Selector Panel with Marker Beacon
1.3
EQUIPMENT DESCRIPTION
The KMA 28B-series is a state of the art audio isolation amplifier and audio selector that contains an
automatic voice activated (VOX) intercom system. It can switch up to three transceivers (Com 1, Com 2,
and Com 3) and six receivers (Nav 1, Nav 2, ADF, DME, MKR, and AUX).
A duplex COM 3 mode (selectable at installation) allows the KMA 28B to act as an audio interface be-
tween aircraft headphone and microphones and specific aircraft approved (FAA/FCC) cellular telephone
equipment.
Warning: Use of non-aviation approved cellular telephone equipment may be prohibited by regulation.
Honeywell is not responsible for unauthorized airborne use of cellular telephones.
For airborne use, the KMA 28B must be interfaced with an approved system.
There are four unswitched inputs, available for traffic or EGPWS, autopilot disconnect, and/or radar al-
timeter warning.
Push buttons select the receiver audio source provided to the headphones. A SPR button allows the user to
listen to the receiver(s) selected on the cabin speaker. Except for the unswitched inputs, all speaker audio
is muted during transmit.
Push buttons select one of the communication transceivers for the pilot and copilot position, and allows
radio transmission. In "Split Mode" the KMA 28B has the ability to allow the pilot and copilot to operate
different transceivers independently. The Com 3/TEL mode (selected at installation) allows the pilot to
use the audio panel for duplex operation, such as with specific cellular telephones. External switches per-
mit telephone operation for the copilot and passengers.
A fail-safe mode connects the pilot headphone and microphone to COM 1 if power is removed for any
reason, or if the power switch is placed in the Off (Fail-safe) position. Unswitched input #1 is also con-
nected to the pilot headset in Fail-safe mode.
A six-station voice activated (VOX) intercom is included in the KMA 28B. This system has exclusive
IntelliVox® circuitry that eliminates manual adjustments. The system contains six separate VOX mic cir-
cuits, and only opens the microphone channel in use.
The intercom system incorporates pilot isolate and crew modes, two independent stereo music inputs with
"Soft Mute," and flashing LED indicators for transmit indications. Intercom control is through two front
panel- mounted volume knobs and 3-position mode switch. The concentric volume controls the intercom
level for the pilot and copilot, while the outer knob controls the passenger intercom volume. Intercom
squelch is automatic.
D201106000060
Bendix/King
KMA 28B Audio Selector Panel and Intercom System
Installation and Operator's Manual
Page 1-1
Honeywell Part Number
066- 0 1211-0000
June 2011
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