Honeywell BENDIX/KING KMA28 User manual

Installation and Operation Manual
BENDIX/KING
BENDIX/KINGBENDIX/KING
BENDIX/KING
®
KMA 28
FAA-Approved TSO C50c, C35d
JAA-Approved JTSO-2C35d, C50c
Audio Amplifier /Intercom/
Marker Beacon Receiver
Document P/N 006-10565-0000
REVISION 0, SEPTEMBER 2000
WARNING
Prior to export of this document, review for export license requirement is needed.
Honeywell International, Inc. 2000©
Copyright Notice
Reproduction of this publication, or any portion thereof, by any means without the express written permission of Honeywell
International, Inc. is prohibited. For further information contact the Manager, Technical Publications; Honeywell Business &
General Aviation, Olathe, Kansas 66061. Phone [phone].

Bendix/King
KMA28
Audio Amplifier/Intercom/Marker Beacon Receiver
006-10565-0000 Page iRev. 0, Sept. 2000
Table of Contents
1 SECTION I GENERAL INFORMATION.........................................................................1-1
1.1 INTRODUCTION...........................................................................................................1-1
1.2 SCOPE.............................................................................................................................1-1
1.3 EQUIPMENT DESCRIPTION.....................................................................................1-1
1.4 APPROVAL BASIS - .....................................................................................................1-2
1.5 SPECIFICATIONS ........................................................................................................1-3
1.6 EQUIPMENT SUPPLIED.............................................................................................1-4
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED....................................................1-5
1.8 LICENSE REQUIREMENTS.......................................................................................1-5
2 SECTION II - INSTALLATION.........................................................................................2-1
2.1 GENERAL INFORMATION........................................................................................2-1
2.1.1 SCOPE........................................................................................................................2-1
2.1.2 CERTIFICATION REQUIREMENTS.................................................................................2-1
2.2 UNPACKING AND PRELIMINARY INSPECTION................................................................2-1
2.3 EQUIPMENT INSTALLATION PROCEDURES....................................................................2-1
2.3.1 COOLING REQUIREMENTS...........................................................................................2-1
2.3.2 MOUNTING REQUIREMENTS .......................................................................................2-1
2.3.3 MOUNTING RACK INSTALLATION ...............................................................................2-2
2.3.4 CONNECTOR ASSEMBLY .............................................................................................2-2
2.4 CABLE HARNESS WIRING ...............................................................................................2-2
2.4.1 NOISE ..........................................................................................................................2-2
2.4.2 EXISTING KMA-24 INSTALLATION.............................................................................2-3
2.4.3 EXISTING PS ENGINEERING PMA6000 INSTALLATIONS ............................................2-3
2.4.4 POWER ........................................................................................................................2-3
2.4.5 COMMUNICATIONS PUSH-TO-TALK ............................................................................2-3
2.4.6 TRANSMIT INTERLOCK................................................................................................2-3
2.4.7 "SWAP" MODE ............................................................................................................2-4
2.4.8 BACKLIGHTING ...........................................................................................................2-4
2.4.9 UNSWITCHED INPUTS..................................................................................................2-4
2.4.10 INTERCOM WIRING ....................................................................................................2-4
2.4.11 COM 3 AUDIO............................................................................................................2-5
2.4.12 PUBLIC ADDRESS FUNCTION.....................................................................................2-5
2.4.13 PA MUTE (J1, PIN 18)...............................................................................................2-6
2.4.14 CONTROL OUTPUT (J2, PIN 4)...................................................................................2-6
2.4.15 VOX OVERRIDE (J2, PIN U) .....................................................................................2-6
2.5 MARKER INSTALLATION.................................................................................................2-6
2.5.1 MIDDLE MARKER SENSE ............................................................................................2-6
2.5.2 EXTERNAL MARKER LIGHTS ......................................................................................2-6
2.5.3 MARKER ANTENNA INSTALLATION ............................................................................2-6
2.6 ADJUSTMENTS..................................................................................................................2-7
2.7 COMMUNICATIONS ANTENNA INSTALLATION NOTES..................................................2-7
2.8 WIRELESS TELECOMMUNICATIONS INTERFACE ...........................................................2-7
2.8.1 HOOK SWITCHES.........................................................................................................2-8
2.9 KMA 28 PIN ASSIGNMENTS ...........................................................................................2-9
2.10 POST INSTALLATION CHECKOUT ...............................................................................2-10
2.11 UNIT INSTALLATION....................................................................................................2-10

Bendix/King
KMA28
Audio Amplifier/Intercom/Marker Beacon Receiver
006-10565-0000 Page ii Rev. 0, Sept. 2000
2.11.1 OPERATIONAL CHECKOUT ......................................................................................2-10
2.11.2 RECEIVER SENSITIVITY...........................................................................................2-11
2.12 CELLULAR INTERFACE CHECKOUT ...........................................................................2-11
2.13 FINAL INSPECTION.......................................................................................................2-11
3 SECTION III KMA28 OPERATION.................................................................................3-1
3.1 AUDIO SELECTOR............................................................................................................3-1
3.1.2 SPEAKER AMPLIFIER...................................................................................................3-1
3.1.3 PUBLIC ADDRESS (PA) FUNCTION .............................................................................3-2
3.2 POWER SWITCH /EMERGENCY (EMG) OPERATION.....................................................3-2
3.3 MICROPHONE SELECTOR................................................................................................3-2
3.3.1 SWAP MODE (SWITCH FROM COM 1 TO COM 2 REMOTELY) ...................................... 3-3
3.3.2 SPLIT MODE ................................................................................................................3-3
3.3.3 TELEPHONE MODE......................................................................................................3-3
3.4 INTERCOM SYSTEM .........................................................................................................3-4
3.4.1 INTELLIVOX® VOX-SQUELCH....................................................................................3-4
3.4.2 VOLUME CONTROL .....................................................................................................3-5
3.5 MARKER BEACON OPERATION ......................................................................................3-7
3.6 TELEPHONE OPERATION (IF EQUIPPED WITH APPROVED SYSTEM).............................3-7
4 APPENDIX A – INSTALLATION DRAWINGS ................................................................A
5 APPENDIX B BOTTOM CONNECTOR INTERCONNECT........................................... B
6 APPENDIX C TOP CONNECTOR INTERCONNECT..................................................... C
7 APPENDIX D- INSTRUCTIONS FOR FAA FORM 337 AND CONTINUING
AIRWORTHINESS......................................................................................................................D
7.1 INSTRUCTIONS FOR FAA FORM 337 ................................................................................ D
INSTRUCTIONS FOR CONTINUING AIRWORTHINESS, AUDIO PANELS .................D
APPENDIX E RTCA DO160C (EUROCAE ED-14) ENVIRONMENTAL
QUALIFICATION FORM.......................................................................................................... E

Bendix/King
KMA28
Audio Amplifier/Intercom/Marker Beacon Receiver
006-10565-0000 Page 1-1 Rev. 0, Sept. 2000
Section I GENERAL INFORMATION
1.1 INTRODUCTION
The KMA 28 represents the next step in cockpit audio control and intercommunications.
Using proprietary IntelliVox® design, this unit eliminates the requirements for intercom
squelch adjustments. The unit is designed for outstanding ergonomics and visually de-
fined mode annunciation and selection.
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 28.
1.2 SCOPE
This manual provides detailed installation and operation instructions for the Honeywell,
Inc. KMA 28 Audio Selector Panel/Intercom System
Model Description Part Number
KMA 28 Stereo Audio Panel with Marker 066-01176-0101
1.3 EQUIPMENT DESCRIPTION
The KMA 28 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 transceiv-
ers (Com 1, Com 2 and Com 3) and six receivers (Nav 1, Nav 2, ADF, DME, MKR and
AUX).
The TEL mode allows the KMA 28 to act as an audio interface between aircraft head-
phone 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, Inc. is not responsible for unauthorized airborne use of cellular telephones.
There are two unswitched inputs, for autopilot disconnect, and/or radar altimeter 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.
A rotary switch selects one of the three communication transceivers for the pilot and co-
pilot position, and allows radio transmission. In "Split Mode" the KMA 28 has the ability
to allow the pilot and copilot to operate different transceivers independently. The TEL
mode allows the pilot to use the cellular telephone interface. External switches permit
telephone operation for the copilot and passengers.
An emergency 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 (emergency ) position.
I
ntelliVox® is a trademark of PS Engineering, Incorporated, and used with their permission

Bendix/King
KMA28
Audio Amplifier/Intercom/Marker Beacon Receiver
006-10565-0000 Page 1-2 Rev. 0, Sept. 2000
A six-station voice activated (VOX) intercom is included in the KMA 28. This system
has the advanced IntelliVox® circuitry that eliminates manual adjustments. The system
contains six separate VOX mic circuits, and only opens the microphone channel in use.
The intercom system incorporates pilot isolate and crew modes, two stereo (or mono de-
pending on unit) music inputs with "Soft Mute," and LED indicators for swap and trans-
mit indications. Intercom control is through front panel-mounted knob and 3 position
mode switch. A single volume controls intercom level for the pilot and copilot. Passenger
headphone volume is factory set, and adjusted in flight with headset-mounted volume
controls. Passenger volume control is further adjustable through screwdriver access in the
top of the unit. Intercom squelch is automatic.
A 3-light Marker Beacon receiver is integrated in the KMA 28. This provides the neces-
sary Marker Beacon lights and audio indications necessary for an Instrument Landing
System (ILS) approach.
1.4 APPROVAL BASIS -
TSO Approval.
The KMA 28 Audio Selector Panel is FAA approved under TSO C50c (Audio Amplifi-
ers) and TSO C35d (Marker Beacon Receivers). In addition, they are approved by the
Joint Airworthiness Authorities under JTSO C50C and JAR-TSO 2C35d. The TSO
holder and manufacturer is PS Engineering, Incorporated, Lenoir City Tenn., USA.
The KMA28 complies with relevant portions of EUROCAE RTCA MPS WG No. 7/70,
DO-143 and (Marker Beacon Receivers), ED-14C/DO-160C (Environmental Conditions
and Test Procedures for Airborne Equipment), ED12B/DO-178B (Software Considera-
tions for Airborne Equipment) and ED- 18/DO-214 (Audio Systems Characteristics and
Minimum Operational Performance Standards for Aircraft Audio Systems).
Operation is subject to the following conditions:
This device may not cause harmful interference.
This device must accept any interference received, including interference that may cause
undesired operation.

Bendix/King
KMA28
Audio Amplifier/Intercom/Marker Beacon Receiver
006-10565-0000 Page 1-3 Rev. 0, Sept. 2000
1.5 SPECIFICATIONS TSO COMPLIANCE
Marker Beacon: C35d, Class A
Audio Selector/Intercom: C50c, Class A
APPLICABLE DOCUMENTS: RTCA/DO-214
RTCA/DO-143
RTCA/DO-160C
RTCA/DO-178B
ENVIRONMENTAL Qualifications: A1D1/CA(MN)XXXXXXBBBBTBKXX
Temperature Range:
Operating:
Storage:
-15º C to +55ºC
-55º C to +85ºC
Altitude: Up to 50,000 feet in an non-pressurized area of
the cockpit.
DIMENSIONS: Height: 1.3 in. (3.3 cm) Width: 6.25 in. (16.9 cm)
Depth: 6.8 in. (17.3 cm)
WEIGHT (With Rack & Connectors): 1.5 lb. (0.54 kg)
POWER REQUIREMENTS (Including Internal Lighting):
Voltage: 11 to 33 VDC
Maximum Current: 2.5 Amp (Externally protected by a 3 Amp circuit
breaker.)
Typical operating current:
Speaker off:
Speaker on, 28V, full radio volume
350 mA
1.5 A
Audio Selector Specifications
Audio selector panel input impedance:510 Ω
Input Isolation: -60 dB (min.)
Speaker Muting: -60 dB (min.)
Speaker Output (into 4 Ω) with no clipping
14 VDC:
28 VDC:
3 Watts (min.)
10 Watts (min.)
Receiver Inputs:9
(Com 1, Com 2, Com 3, Nav 1, Nav 2, ADF,
DME, MKR, AUX)
Unswitched Inputs:2
(examples: GPS WPT, Value, Autopilot Discon-
nect, Altimeter DH)
Transmitter Selections:6
(Com 1, Com 2, Com 3
Com1/2, Com2/1, Telephone)
Speaker Impedance:4 Ω
Headphone Impedance:150 - 1000 Ω
Headphone Output: 38 mW each headset, no clipping <1% THD
70 mW each headset with < 10% THD into 150Ω
Microphone Impedance:150 - 600 Ω

Bendix/King
KMA28
Audio Amplifier/Intercom/Marker Beacon Receiver
006-10565-0000 Page 1-4 Rev. 0, Sept. 2000
Intercom Specifications
Intercom Positions: 6 places (with individual IntelliVOX® circuits)
Music Inputs: 2 (Stereo)
Music Muting: >-30 dB "Soft Mute" when Com or intercom active.
Distortion: <1% THD @ 38 mW into 150Ω
<10% THD @ 70mW into 150 Ω
Mic Freq. Response, 3 dB: 300 Hz - 6000 Hz
Music Freq. Response, 3 dB: 100 Hz - 18kHz
MARKER BEACON RECEIVER
Frequency: 75 MHz Crystal Controlled
Sensitivity:
Low:
High:
Capable of:
1000 µVolts (Hard)
200 µVolts (Hard)
(preset at factory for field application)
Selectivity: -6 dB at ±10 kHz
-40 dB at ±120 kHz
External Lamp Output: 9.0 (±2.5 unloaded, at maximum brightness) VDC posi-
tive when active, max. current 125 mA
MM Sense: Active high (4.7 VDC ± 0.5V) during Middle Marker
acquisition, for autopilot use.
1.6 EQUIPMENT SUPPLIED
1 ea. of the following:
Model Part Number
KMA 28 066-01176-0101
KMA 28 Installation Kit, 050-03613-0001, contains the following parts.
Description Quantity Part
Number
KMA28 install rack 1 071-00164-0001
Top Molex Connector Shell w/key, 44 pin, key 4/5 1 120-425-4402
Bottom Molex Connector Shell w/key, 44 pin, key 7/8 1 120-425-4400
Gold Plated Crimp Pins 88 425-001-0002
4 40 X 7/16 screw w/nyl patch 4 475-440-0007
Grounding strap 1 430-007-0001
6-32 X 3/4 screw php 2 475-632-0038
6-32 Nut Flat 2 475-632-0003
6-32 Lock Nut 2 475-632-0004
Cable Clamp 1 625-001-0002
#6-32 x ½” FHP screw 6 475-632-0012
#6-32 Clip Nut 6 475-630-0002
The KMA 28 install rack may be purchased separately under part number 071-00164-0001.

Bendix/King
KMA28
Audio Amplifier/Intercom/Marker Beacon Receiver
006-10565-0000 Page 1-5 Rev. 0, Sept. 2000
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED
a) Circuit Breaker: 1 ea. 3 amp
b) Speaker, 4 Ω
c) Headphone Jacks (Stereo, as Required)
d) Microphone Jacks (as Required)
e) Headphones, 150 Ω(Stereo), up to 6 as required
f) Microphones, up to 6 as required
g) Marker Antenna (75 MHz, VSWR <1:1.5, 50 ohm, and cable (RG400 R/U)
h) Interconnect Wiring
1.8 LICENSE REQUIREMENTS
None

Bendix/King
KMA28
Audio Amplifier/Intercom/Marker Beacon Receiver
006-10565-0000 Page 2-1 Rev. 0, Sept. 2000
Section II - Installation
2.1 GENERAL INFORMATION
2.1.1 SCOPE
This section provides detailed installation and interconnect instructions for the Honey-
well, Inc. KMA28 Audio Selector Panel/Intercom System with internal Marker Beacon.
Please read this manual carefully before beginning any installation to prevent damage and
post-installation problems. Installation of this equipment requires special tools and
knowledge.
2.1.2 Certification Requirements
When the digital audio warning system is installed in a certified aircraft, certification ba-
sis is the installer’s responsibility. Due to the variety and options available for interface,
Honeywell will only provide manufacturers’ data for our equipment interface.
2.2 Unpacking and Preliminary Inspection
Use care when unpacking the equipment. Inspect the units and parts supplied for visible
signs of shipping damage. Examine the unit for loose or broken buttons, bent knobs, etc.
Verify the correct quantity of components supplied with the list in Section 1.6. If any
claim is to be made, save the shipping material and contact the freight carrier. Do NOT
return units damaged in shipping to Honeywell. If the unit or accessories shows any sign
of external shipping damage, contact Honeywell to arrange for a replacement. Under no
circumstances attempt to install a damaged unit in an aircraft. Equipment returned to
Honeywell for any other reason should be shipped in the original packaging, or other UPS
approved packaging.
2.3 Equipment Installation Procedures
2.3.1 Cooling Requirements
Forced air cooling of the KMA 28 is not required. However the unit should be kept away
from heat producing sources (i.e. defrost or heater ducts, dropping resistors, heat produc-
ing avionics) without adequate cooling air provided.
2.3.2 Mounting Requirements
The KMA 28 must be rigidly mounted to the instrument panel of the aircraft structure and
within view and reach of the pilot position(s). Installation must comply with FAA Advi-
sory Circular AC 43.13-2A. The unit may be mounted in any area where adequate clear-
ance for the unit and associated wiring bundle exist.
Avoid installing the audio panel close to high current devices or systems with high-
voltage pulse type outputs, such as DME or transponders.

Bendix/King
KMA28
Audio Amplifier/Intercom/Marker Beacon Receiver
006-10565-0000 Page 2-2 Rev. 0, Sept. 2000
2.3.3 Mounting Rack Installation
Set the unit aside in a safe location until needed. Install the tray using six FHP 6-32 x ½"
screws. The audio selector panel must be supported at front and rear of the mounting tray.
2.3.4 Connector Assembly
The unit connectors mate directly with the circuit boards in the KMA 28. The connectors
are a Molex crimp-type, and require the use of a Molex hand crimp tool, EDP P/N 11-01-
0203, CR6115B (or equiv.). The connectors are mounted to the unit tray with #4-40
screws, from the inside of the tray. Ensure that proper strain relief and chafing precau-
tions are made during wiring and installation.
2.4 Cable Harness Wiring
Referring to the appropriate Appendix, assemble a wiring harness as required for the in-
stallation. All wires must be MIL-SPEC in accordance with current regulations. Two- and
three-conductor shielded wire must be used where indicated, and be MIL-C-27500 or
equivalent specification. Proper stripping, shielding and soldering technique must be used
at all times. It is imperative that correct wire be used.
Refer to FAA Advisory Circular 43.13-2A for more information. Failure to use correct
techniques may result in improper operation, electrical noise or unit failure. Damage
caused by improper installation will void the warranty.
2.4.1 Noise
Due to the variety and the high power of radio equipment often found in today's general
aviation aircraft, there is a potential for both radiated and conducted noise interference.
The KMA 28 power supply is specifically designed to reduce conducted electrical noise
on the aircraft power bus by at least 50dB. Although this is a large amount of attenuation,
it may not eliminate all noise, particularly if the amplitude of noise is very high. There
must be at least 13.8 VDC present at the bottom connector, pin 20, of the KMA 28 for the
power supply to work in its designed regulation. Otherwise, it cannot adequately attenuate
power line noise. Shielding can reduce or prevent radiated noise (i.e., beacon, electric gy-
ros, switching power supplies, etc.) However, installation combinations can occur where
interference is possible. The KMA 28 was designed in a RFI hardened chassis and has
internal Electromagnetic Interference (EMI) filters on all inputs and outputs.
Ground loop noise occurs when there are two or more ground paths for the same signal
(i.e., airframe and ground return wire). Large cyclic loads such as strobes, inverters, etc.,
can inject noise signals onto the airframe that are detected by the audio system. Follow
the wiring diagram very carefully to help ensure a minimum of ground loop potential. Use
only Mil Spec shielded wires (MIL-C-275000, or better).
Radiated signals can be a factor when low level microphone signals are "bundled" with
current carrying power wires. Keep these cables physically separated. It is very important