Honeywell Bendix/King KMA 30 User Manual
KMA 30
Audio Panel with Marker Beacon Receiver
High-fidelity Stereo Intercom
FAA- TSO C50c, C35d
EASA ETSO C50c, 2C35d
Patented under one or more of the following;
No. 4,941,187; 5,903,227; 6,160,496 and 6,493,450
Document P/N 200-890-5464 Rev. 1, Aug. 2012
Bendix/King, Inc. 2012 ©
Copyright Notice
Any reproduction or retransmittal of this publication, or any portion thereof, without the expressed written permission of Bendix/King,
Inc. is strictly prohibited. For further information contact the Publications Manager at Phone (865) 988-9800.
Manufactured for Bendix/King, a division of Honeywell Int’l, Inc.
Albuquerque, NM 87113, USA
Table of Contents
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.................................................................................................................... 1-2
1.6 EQUIPMENT SUPPLIED......................................................................................................... 1-4
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED.................................................................. 1-4
1.8 OPTIONAL ITEMS................................................................................................................... 1-4
1.9 LICENSE REQUIREMENTS ................................................................................................... 1-4
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 AUDIO PANEL MOUNTING RACK INSTALLATION........................................................... 2-1
2.3.4 AUDIO PANEL TRAY AND CONNECTOR ASSEMBLY....................................................... 2-2
2.4 CABLE HARNESS WIRING ............................................................................................................ 2-2
2.4.1 ELECTRICAL NOISE...................................................................................................... 2-2
2.4.2 EXISTING GMA340 INSTALLATION .............................................................................. 2-3
2.4.3 POWER ........................................................................................................................ 2-3
2.4.4 AUDIO PANEL INTERFACE ............................................................................................ 2-3
2.4.5 TRANSMIT INTERLOCK................................................................................................. 2-3
2.4.6 BACKLIGHTING............................................................................................................ 2-4
2.4.7 UNSWITCHED INPUTS................................................................................................... 2-4
2.4.8 "SWAP" MODE............................................................................................................. 2-4
2.4.9 TEL (DUPLEX) FUNCTION FOR CELL PHONES .............................................................. 2-5
2.4.10 PUBLIC ADDRESS MODE ............................................................................................ 2-5
2.4.11 PA MUTE (J2, PIN 12)................................................................................................ 2-7
2.4.12 MISCELLANEOUS LOGIC OUTPUT (J2, PIN 18) ............................................................ 2-7
2.4.13 AUDIO ACTIVE OUTPUT ............................................................................................. 2-7
2.5 INTERCOM WIRING ...................................................................................................................... 2-7
2.5.1 ENTERTAINMENT INPUTS ............................................................................................. 2-7
2.5.2 ENTERTAINMENT MUTING............................................................................................ 2-7
2.5.3 CONFIGURING MUSIC INPUT WITH FUNCTION KEYS ..................................................... 2-8
2.5.4 PLAYBACK BUTTON INSTALLATION.............................................................................. 2-8
2.6 MARKER BEACON INSTALLATION ............................................................................................... 2-8
2.6.1 MARKER ANTENNA INSTALLATION.............................................................................. 2-8
2.6.2 EXTERNAL MARKER LIGHTS........................................................................................ 2-9
2.6.3 MIDDLE MARKER SENSE ............................................................................................. 2-9
2.7 ADJUSTMENTS ............................................................................................................................. 2-9
2.8 COMMUNICATIONS ANTENNA INSTALLATION NOTES ................................................................ 2-10
2.9 KMA 30 PIN ASSIGNMENTS ....................................................................................................... 2-11
2.10 WIRING CHECKOUT ................................................................................................................ 2-12
2.11 UNIT INSTALLATION................................................................................................................ 2-12
2.12 OPERATIONAL CHECKOUT ...................................................................................................... 2-12
Bendix/King by Honeywell
KMA 30 Audio Panel and Intercom System
Installation and Operator’s Manual
200-890-5464 Page ii Rev. 1, Aug. 2012
2.12.1 REQUIRED TEST EQUIPMENT ................................................................................... 2-12
2.12.2 AUDIO PANEL TEST ................................................................................................. 2-12
2.12.3 MARKER CHECKOUT ............................................................................................... 2-13
2.12.4 TEL CHECKOUT ...................................................................................................... 2-13
2.12.5 INTERNAL RECORDER CHECKOUT............................................................................ 2-13
2.12.6 FUNCTION BUTTON CHECKOUT ............................................................................... 2-13
2.13 FINAL INSPECTION................................................................................................................... 2-13
Section III OPERATION.......................................................................................3-1
3.1 SCOPE ....................................................................................................................................... 3-1
3.2 COMMUNICATIONS TRANSMIT (XMT) SELECTION (2) ................................................................ 3-1
3.3 AUDIO SELECTOR (4)................................................................................................................... 3-2
3.4 TELEPHONE (TEL) (9)................................................................................................................. 3-2
3.4.1 CELL PHONE SIDETONE................................................................................................ 3-3
3.5 SPEAKER AMPLIFIER (5).............................................................................................................. 3-3
3.6 MARKER BEACON OPERATION (10)............................................................................................. 3-3
3.7 INTERCOM OPERATION ............................................................................................................... 3-4
3.7.1 INTELLIVOX® VOX-SQUELCH...................................................................................... 3-4
3.7.2 INTERCOM VOLUME CONTROL (7) ............................................................................... 3-4
3.7.3 INTERCOM MODES (8) ................................................................................................. 3-5
3.8 MUSIC AND MUSIC MUTING (6) ................................................................................................... 3-5
3.8.1 MUSIC IN PILOT ISO MODE .......................................................................................... 3-6
3.9 TELEPHONE MODE (9)................................................................................................................. 3-6
3.9.1 CELLULAR TELEPHONE SIDETONE ................................................................................ 3-7
3.10 UTILITY JACK ........................................................................................................................... 3-7
3.10.1 CELLULAR PHONE ...................................................................................................... 3-7
3.10.2 AUDIO ADVISORY INPUT............................................................................................ 3-7
3.10.3 MUSIC INPUT............................................................................................................. 3-7
3.11 SMART FUNCTION KEYS (SFK) ................................................................................................. 3-8
3.11.1 “INTERCOM” ALTERNATE INTERCOM FUNCTION (A) .................................................... 3-8
3.11.2 MONITOR (B)............................................................................................................. 3-9
3.11.3 MUSIC (C) ................................................................................................................. 3-9
3.11.4 MUSIC 1 VOLUME.................................................................................................... 3-10
3.11.5 POWER ON ANNOUNCEMENT.................................................................................... 3-11
3.12 BLUETOOTH® INTERFACE ....................................................................................................... 3-11
3.12.1 PAIRING AND UNPAIRING BLUETOOTH DEVICES........................................................ 3-11
3.13 INTERNAL RECORDER AND PLAYBACK..................................................................................... 3-11
Section IV – Warranty ...........................................................................................4-1
4.1 WARRANTY ................................................................................................................................. 4-1
Appendix A – KMA 30 Installation Drawings ........................................................ A
Appendix B – J1 Connector Interconnect ............................................................... B
Appendix C – J2 Connector Interconnect............................................................... C
Appendix D – Instructions for FAA Form 337 and continuing airworthiness....... D
8.1 INSTRUCTIONS FOR FAA FORM 337, AUDIO PANELS......................................................................D
8.2 INSTRUCTIONS FOR CONTINUING AIRWORTHINESS, AUDIO SYSTEM ..............................................D
Appendix E – RTCA DO160D Environmental Qualification Form............................ E
Rev Date Change
New July 2012 New release
1 Aug. 2012 Updated picture of panel for Playback feature
Bendix/King by Honeywell
KMA 30 Audio Panel and Intercom System
Installation and Operator’s Manual
200-890-5464 Page 1-1 Rev. 1, Aug. 2012
Section I – GENERAL INFORMATION
1.1 INTRODUCTION
The KMA 30 represents another evolutionary step in cockpit audio control and intercommunications utility. Using our patented IntelliVox® design, front panel utility jack, and pilot programmable configurations, this marks the next level of audio control. The unit is designed for outstanding ergonomics and
visually defined 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 30.
1.2 SCOPE
This manual provides detailed installation and operation instructions for the Bendix/King KMA 30-series
of Audio Selector Panel/Intercom Systems. This includes the following units:
Model Description Bendix/King
Part Number
PS Part Number
KMA 30 Stereo Audio Selector Panel with Marker Beacon, in-
cludes utility jack and Internal Recorder System
89000003-100 050-890-5464
1.3 EQUIPMENT DESCRIPTION
The KMA 30 is a state-of-the-art audio isolation amplifier and audio selector that contains an automatic
voice activated (VOX) intercom system and integral marker beacon receiver. It can switch two transceivers (Com 1, Com 2) and six receivers (Nav 1, Nav 2, ADF, DME, MKR and AUX).
A full duplex TEL mode allows the KMA 30 to act as an audio interface between aircraft headphone and
microphones and specific aircraft approved (FAA/FCC) cellular telephone equipment, through the front
mounted jack.
Warning: Use of non-aviation approved cellular telephone equipment may be prohibited by FCC regulation.
Bendix/King is not responsible for unauthorized airborne use of cellular telephones.
For airborne use, the KMA 30 must be interfaced with an approved system.
There are five unswitched inputs, available for traffic or EGPWS, autopilot disconnect, and/or radar altimeter warning, with the fifth unswitched input through a front-mounted utility jack, when configured to
act as a fifth unswitched input.
Pushbuttons 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. Unswitched inputs 1,3, and 4 are always presented to the aircraft speaker.
Unswitched input 2 will be presented to the speaker when the front panel SPR push button has been selected.
Pushbutton switches select one of the communication transceivers for the pilot and copilot position, and
allows radio transmission. In "Split Mode" the KMA 30 has the ability to allow the pilot to transmit on
Com 1 while the copilot can transmit on Com 2. 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 (Failsafe) position. Unswitched input #1 is also provided to the pilot headphone in fail-safe
A six-station voice activated (VOX) intercom is included in the KMA 30. This system has Bendix/King’s
patented IntelliVox® circuitry that eliminates manual adjustments. The intercom system incorporates pilot
isolate, all and crew modes, two independent stereo music inputs with "SoftMute™". Intercom volume
control is through two concentric front panel knobs and a pushbutton intercom mode switch. The small
Bendix/King by Honeywell
KMA 30 Audio Panel and Intercom System
Installation and Operator’s Manual
200-890-5464 Page 1-2 Rev. 1, Aug. 2012
volume knob controls the intercom level for the pilot and copilot, while the large knob controls the passenger intercom volume. Intercom squelch is automatic.
A 3-light, 75 MHz Marker Beacon receiver is integrated in the KMA 30. This provides the necessary
Marker Beacon lights and audio indications necessary for that portion of an Instrument Landing System
(ILS) approach. A pushbutton labeled MKR allows the pilot select high or low sensitivity as well as test
and mute modes.
In the KMA 30, a Bluetooth® wireless interface is available for wireless telephone and music connection.
1.4 APPROVAL BASIS
FAA TSO Approval.
The KMA 30-series Audio Selector Panels are FAA approved under TSO C50c (Audio Amplifiers) and
TSO C35d (Marker Beacon Receivers), ETSO C50C/ and 2C53d.
All systems comply 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, Level D (Software Considerations 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.
1.5 SPECIFICATIONS
TSO COMPLIANCE
Marker Beacon:
FAA TSO C35d, Class A ETSO 2C35d
Audio Selector/Intercom:
FAA TSO C50c, Class 1a ETSO C50c
APPLICABLE DOCUMENTS:
RTCA/DO-214 RTCA/DO-143 RTCA/DO-160D
RTCA/DO-178B DO-254
ENVIRONMENTAL Qualifications:
A1D1CABSMXXXXXXZBABATBXXE2XXX
Operating Temperature Range:
-15º C to 55ºC
Altitude:
Up to 50,000 feet in an non-pressurized area
DIMENSIONS:
Height: 1.3 in. (3.3 cm) Width: 6.25 in. (16.9 cm)
Depth behind panel 7.15 in. (18.16 cm)
WEIGHT
KMA 30 Unit
Rack with connectors
1.34 lb. (0.61 kg)
0.51 lb. (0.24 kg)
POWER REQUIREMENTS (Including Internal Lighting):
Voltage:
11 to 33 VDC
Maximum Current:
2.5 Amp (Externally protected by a 5A pull-type
breaker)
Bendix/King by Honeywell
KMA 30 Audio Panel and Intercom System
Installation and Operator’s Manual
200-890-5464 Page 1-3 Rev. 1, Aug. 2012
Audio Selector Specifications
Audio selector panel input impedance:
510
Input Isolation:
-60 dB (min.)
Speaker Muting:
-60 dB (min.)
Speaker Output (into 4 ) with no clipping
14 VDC:
28 VDC:
3 Watts (min.)
10 Watts (min.)
Receiver Inputs:
9 (Com 1, Com 2, TEL, Nav 1, Nav 2, ADF, DME,
MKR, AUX)
Unswitched Inputs:
5 (including front jack)
Transmitter Selections:
4 (Com 1, Com 2, TEL
Com1/2)
Speaker Impedance:
4
Headphone Impedance:
150 – 1000
Headphone Output:
38 mW each headset, no clipping <1% THD typical
Microphone Impedance:
150 - 600
Bluetooth Radio (KMA 30 -0702 only)
Class 3, FCC ID QOQWT32AE
Intercom Specifications
Intercom Positions: 6 places (with individual IntelliVox® circuits)
Music Inputs:
2, (Independent, Stereo)
Music Muting:
>-30 dB "Soft Mute" when Com or intercom active.
Distortion:
<1% THD @ 38 mW into 150
Mic Freq. Response, 3 dB:
300 Hz - 6000 Hz
Music Freq. Response, 3 dB:
10 Hz – 26 kHz
MARKER BEACON RECEIVER:
Frequency:
75 MHz Crystal Controlled
Sensitivity:
Low:
High:
Capable of: (preset at factory for field application)
1000 Volts (Hard) (360 to 570 V soft)
200 Volts (Hard) (130 to 200 V soft)
Selectivity:
-6 dB at ±10 kHz
-40 dB at ±120 kHz
External Lamp Output:
7.5 (±4 VDC unloaded, at maximum brightness) VDC
positive when active, max. current 125 mA
MM Sense:
Active high (4.5 ± 1.0VDC)
Table 1-1 Specifications
Bendix/King by Honeywell
KMA 30 Audio Panel and Intercom System
Installation and Operator’s Manual
200-890-5464 Page 1-4 Rev. 1, Aug. 2012
1.6 EQUIPMENT SUPPLIED
1 ea. of the following units:
Model Description Bendix/King Part
Number
PS Part Number
KMA 30 KMA 30 Audio Panel with Marker, Stereo Intercom, and Bluetooth
connectivity
89000003-100 050-890-5464
Table 1-2 Unit Part numbers
KMA 30 Installation Kit: 250-890-5464 Bendix/King Part Number 89000003-200
Description Quantity Part
Number
Installation rack assembly 1 430-890-5464
Rack back plate 1 430-890-0050
44-pin connector kit 2 120-891-2045Backshell, connector 2 625-025-2465
Backshell Retainer 2 431-881-0100
4 40 X 7/16 screw w/nylon patch 4 475-440-0007
4 40 X 3/8 screw w/nylon patch 4 475-440-1038
4-40 x ¼” screw with lock washer 2 475-440-0001
Solder Lug 2 475-009-0001
Cable Clamp 1 625-001-0002
#6-32 x ½” Flat head Philips screw 6 475-632-0012
#6-32 Clip Nut 6 475-630-0002
Table 1-3 Installation Kit Contents
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED
a. Circuit Breaker: 1 ea; 5 amp PULL TYPE REQUIRED for KMA 30
b. Speaker, 4
c. Headphone Jacks (Stereo, as Required)
d. Microphone Jacks (as Required)
e. Headphones, 150 (Stereo), up to 6 as required
f. Microphones, up to 6 as required
g. Marker Antenna (75 MHz, VSWR <1:1.5, and appropriate for the airspeed)
h. Interconnect Wiring
1.8 OPTIONAL ITEMS
a. Cell Phone Patch Cord, 2.5mm to 2.5mm, PS Part Number 425-006-7026
b. Music Patch Cord, 3.5mm to 2.5mm, PS Part Number 425-006-2535
c. Phone patch cord for iPhone or Blackberry 3.5 mm 4-conductor to 2.5 mm
(Phone only, no music) 425-006-0354
1.9 LICENSE REQUIREMENTS
None
KMA 30 (050-890-5464 only) Bluetooth™ Radio approval:
FCC ID: QOQWT32AE
Industry Canada ID: 5123A-BGTWT32AE
CE EMC Directive 89/336/EEC as amended by Directives 92/31/EEC and 93/68/EEC
Bendix/King by Honeywell
KMA 30 Audio Panel and Intercom System
Installation and Operator’s Manual
200-890-5464 Page 2-1 Rev. 1, Aug. 2012
Section II - INSTALLATION
2.1 GENERAL INFORMATION
2.1.1 SCOPE
This section provides detailed installation and interconnection instructions for the Bendix/King KMA 30
Audio Selector Panel/Intercom/ with internal Marker Beacon.
Please read this manual carefully before beginning any installation to prevent damage and postinstallation problems. Installation of this equipment requires special tools, test equipment (refer to section
2.12.1) and knowledge as required by 14 CFR 65.81 (b).
2.1.2 Certification Requirements
NOTE
The KMA 30 requires specialized knowledge and tools for an effective installation. An appropriately rated
Certified Aircraft Repair Station must install this equipment in accordance with applicable regulations.
Bendix/King, Incorporated warranty is not valid unless the equipment is installed by an authorized Bendix/King, Incorporated dealer.
Failure to follow any of the installation instructions, or installation by a non-certified individual or agency
will void the warranty, and may result in an unairworthy installation.
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 (B). If any claim is to be made, save the shipping material and contact the freight carrier. Do NOT return units damaged in shipping to Bendix/King. If the unit
or accessories show any sign of external shipping damage, contact Bendix/King to arrange for a replacement. Under no circumstances attempt to install a damaged unit in an aircraft. Equipment returned to
Bendix/King for any other reason should be shipped in the original Bendix/King packaging, or other UPS
approved packaging.
2.3 Equipment Installation Procedures
2.3.1 Cooling Requirements
Forced air-cooling of the KMA 30 is not required. However, the units should be kept away from heat producing sources (i.e. defrost or heater ducts, dropping resistors, heat producing avionics) without adequate
cooling air provided.
2.3.2 Mounting Requirements
The KMA 30 must be rigidly mounted to the instrument panel of the aircraft structure, within view and
reach of the pilot position(s). Installation must comply with FAA Advisory Circular AC 43.13-2B, or
other FAA-approved aircraft technical data. The unit may be mounted in any area where adequate clearance for the unit and associated wiring bundle exist.
To prevent noise, avoid installing the unit close to high current devices or systems with high-voltage pulse
type outputs, such as DME or transponders. Avoid running the interconnecting bundles near any high
current wires.
2.3.3 Audio Panel Mounting Rack Installation
Remove the unit from the mounting tray by unscrewing the 3/32" hex-head screw that is in the center of
the unit. Use caution to avoid hitting the photo-detector lens. Carefully slide the unit free of the tray. Set
Bendix/King by Honeywell
KMA 30 Audio Panel and Intercom System
Installation and Operator’s Manual
200-890-5464 Page 2-2 Rev. 1, Aug. 2012
the unit aside in a safe location until needed. Install the tray using six clip nuts (475-630-0002), and six
FHP 6-32 x ½" screws (475-632-0012). The audio selector panel must be supported at front and rear of
the mounting tray.
2.3.4 Audio Panel Tray and Connector Assembly
The rack connectors mate with two 44-pin connectors in the KMA 30. The connectors are a sub-miniature
crimp-type, and require the use a hand crimp tool, from table below (or equiv.). The connectors are
mounted to the tray back plate with #4-40 screws (475-440-1038), from the inside of the tray and the
mounting block, 431-891-0100. Ensure that proper strain relief and chafing precautions are made during
wiring and installation, using the cable clamp (625-001-0002).
Two grounding lugs are provided, which may be attached to the rear mounting plate with 2 ea #4-40 x ¼”
screws with captivated lock washers. These provide a convenient location to connect the shield ground
terminations.
Manufacturer Crimping Tool Positioner Extraction tool
AMP 601966-1 601966-6 91067-1
Daniels AFM8 K42 M24308-1
ITT-Cannon 995-0001-584 995-0001-739 91067-1
Table 2-1 Connector Pin crimping tools
2.4 Cable Harness Wiring
Referring to the appropriate Appendix, assemble a wiring harness as required for the installation. 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 43.13-2B 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 Bendix/King warranty.
2.4.1 Electrical 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 30 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 connector, J2 pins 8 & 9, of the KMA 30 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 gyros, switching power supplies, etc.) However, installation combinations can occur where interference is possible. The KMA 30 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). Under
no circumstances combine a microphone and headphone wiring into the same shielded bundle. Always
use a 2- or 3-conductor, shield wire as shown on the installation-wiring diagram.
The shields can be daisy-chained together, and then connected to the ground lugs mounted on the back
plate shown in Appendix B.
Bendix/King by Honeywell
KMA 30 Audio Panel and Intercom System
Installation and Operator’s Manual
200-890-5464 Page 2-3 Rev. 1, Aug. 2012
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 that you use insulated washers to
isolate the ground return path from the airframe to all headphone and microphone jacks.
2.4.1.1 Music Inputs and Noise
KMA 30 units utilize a differential input to help prevent noise from entering the music system. This feature is usually transparent to the installer; however, it is important that the appropriate music signal and
ground connections are made directly to the dedicated music signal and ground inputs on the KMA 30.
The power for IFE and audio panel should be a common bus.
If a music jack instead of a music source is installed for Music 1 or 2, we recommend grounding the jack
to airframe ground.
NOTE
Adding a high-performance audio control system, particularly in conjunction with high-performance active noise canceling headsets, cannot improve on older avionics that were designed for cabin-speaker use.
Bendix/King makes no claim that the audio panel will provide a noise-free audio quality under all installation conditions, particularly with older avionics.
2.4.2 Existing GMA340 Installation
If the installation replaces a GMA340, no changes are necessary as long as the existing installation meets
the requirements. All existing functions of the GMA340 as well as all of the new capabilities afforded by
the KMA 30 will become instantly available. Be advised, the KMA 30 does not support 3 VHF Coms,
however. The KMA 30 handles two COM transceivers and a full-duplex cellular/satellite telephone.
Added capabilities include, IntelliVox®, DuTel™ duplex telephone, improved music fidelity and Soft
Mute™ and Karaoke™ muting modes, improved and more flexible music distribution control, internal
recorder function, and additional unswitched audio inputs.
Installations where the external marker outputs are connected to a Sandel 3308 Navigation Display will
require additional loading resistors. Refer to the Sandel installation data for more information.
2.4.3 Power
The KMA 30 is compatible with both 14 and 28 Volt DC systems. A five (5) Amp circuit breaker is required for all installations. Power and ground wires should be #22 connected to J2 Pins 8 and 9. Connect
airframe ground to J2 Pin 10 and 11 only. No dropping resistors are required.
2.4.4 Audio Panel interface
The KMA 30 is designed to interface with standard aircraft avionics, and presents a 510 receiver impedance. For best results, a twisted-shielded cable is recommended from the avionics audio source to the
audio panel, with the shield grounded at the audio panel end.
Some avionics do not provide a separate audio low, and may introduce additional electrical noise into the
system. For best results, connect the audio low from the audio panel to the radio ground, using one conductor of the twisted-shielded cable.
2.4.4.1 Speaker Load
The KMA 30 contains one speaker amplifier. Some units with internal speaker amplifiers, such as the
King Radio KX170-series, require a resistive load to prevent damage if their speaker amplifier is not used.
Connect the speaker output from the unit to the COM 2 Speaker load input on the KMA 30 (J1 27 WRT
28). The speaker load is 16 , 3W.
2.4.5 Transmit Interlock
Some communications transceivers use a transmit-interlock system. To fully utilize the Split Mode feature, this function must be disabled. Consult that manufacturer's installation manual.
Bendix/King by Honeywell
KMA 30 Audio Panel and Intercom System
Installation and Operator’s Manual
200-890-5464 Page 2-4 Rev. 1, Aug. 2012
2.4.6 Backlighting
The KMA 30 has an automatic dimming of the pushbutton annunciation LEDs and marker lamps controlled by a photocell. Control of the unit backlighting is through the aircraft avionics dimmer For 14 V
aircraft, connect J2 Pins 6 and 7 to the aircraft dimmer bus, and pin 5 to ground. For 28-volt systems,
connect pin 7 to the aircraft dimmer, and pins 5 and 6 to ground.
If an external dimmer control is not used, a constant back light illumination can be established for nighttime viewing. Pin 6 or 7 (depending on system voltage) must be tied to power (J2, pin 8 or 9) for the back
lighting system to work. The photocell mounted in the unit face will automatically adjust the intensity of
the push-button annunciator LEDs.
2.4.7 Unswitched inputs
J1, pins 31, 29 and J2 pin 15 are unswitched, unmuted (by transmitter keying), inputs # 1, 3 and 4, respectively. These inputs are presented to the pilot and copilot regardless of the audio configuration, and
will always mute the entertainment inputs. These 510Ω inputs can be used for altimeter DH audio, GPS
waypoint audio, autopilot disconnect tones, or any other critical audio signal. Unswitched #1 is always
presented to the speaker, plus to the crew headphones, and is available to the pilot in fail-safe (off) mode.
Unswitched 3 and 4 inputs are always presented to the crew headphones and to the aircraft speaker.
Unswitched
Input
Hear in
Fail Safe
Hear in
Crew Headset
SPR button
Select
Gain
1 Yes Yes No 1:1(fixed)
2 No Yes Yes 1:1(fixed)
3 No Yes No Adjustable
4 No Yes No 1:1(fixed)
5 (jack) No Yes No 1:1(fixed)
Table 2-2 Unswitched input table
Unswitched #2, J1 pin 44 is unswitched is always connected to the Pilot’s headphone. However, this
unswitched audio is only presented to the aircraft speaker when the SPR push button has been selected.
The audio low for unswitched #4 (J2, pin 15) should be connected to a convenient audio low. However,
this should NOT be connected to Music Low.
Unswitched #1 is presented to the pilot headphone in fail-safe (off) mode.
NOTE
Inputs 1, 2 and 4 are fixed (1:1), and any audio level adjustments must be made at the input source.
Unswitched #3 has a variable adjustment control located on the bottom side of the unit. This control allows you to adjust the volume level of that unswitched input. Refer to Adjustments section.
The front panel jack can be configured to act as a fifth unswitched input. When configured through the
front panel function switches (see operational section), the audio input to this jack will be presented to the
pilot and copilot headsets, and not muted.
NOTE
The front-mounted utility jack is intended for portable equipment that is advisory in nature. It is NOT
INTENDED for use as a primary warning channel. Audio of importance MUST ALWAYS be hard-wired
into the unswitched inputs of the audio panel.
2.4.8 "Swap" Mode
When a momentary, normally open, push-button switch is connected between pin 20 on the J2 connector
and aircraft ground, the user can switch between Com 1 and 2 by depressing this switch without having to
touch the mic selector switch. This yoke-mounted switch eliminates the need to remove your hands from
Bendix/King by Honeywell
KMA 30 Audio Panel and Intercom System
Installation and Operator’s Manual
200-890-5464 Page 2-5 Rev. 1, Aug. 2012
the yoke to change transceivers. The transfer of TX indication from Com 1 to Com 2 shows that the swap
has been initiated; there is no dedicated swap indicator.
2.4.9 TEL (Duplex) Function for Cell Phones
Audio streams selected by the intercom mode are provided to the TEL output, and audio from TEL is presented to the headset. This allows a telephone-like audio interface.
The TEL mode in the KMA 30 is compatible with many cellular telephones with hands-free headset interfaces. The front panel 3/32” utility jack can be used as the interface to the Cell Phone, or a jack can be
installed somewhere on the aircraft panel. The wired interface jack is connected with the KMA 30 as
shown: A patch cord (3/32” to 3/32”) is available from Bendix/King under P/N 425-006-7026.
3/32" Cellular Jack
COM 3 Mic Input
Com 3 Audio
Audio Lo
KMA 30
J1
Cellular Plug (typical)
Tip= Microphone out
Ring= Speaker audio
Base=Ground
This is a typical interconnect
Bendix/King does not guarantee
compatability in all cases.
Cellular Phone
Interconnect
Figure 2-1 Cellular telephone interface for rear connector, if an additional jack is desired
The KMA 30 is compatible with most Bluetooth® enabled devices for making and receiving telephone
calls through the aircraft audio system.
2.4.9.1 Cell phone Sidetone
As shipped from Bendix/King, the KMA 30 does provide cellular telephone sidetone (the user’s voice fed
back to the headset). Some cell phones already provide sidetone. In KMA 30 audio panels, Telephone
sidetone can be disabled if desired by pressing the TEL and ADF buttons for more than one second.
NOTE
Unauthorized use of unapproved cellular telephone devices in aircraft is subject to FCC enforcement action, which may include a $10,000 fine per incident.
FCC Regulation 47 CFR § 22.925 Prohibition on airborne operation of cellular telephones.
Cellular telephones installed in or carried aboard airplanes, balloons or any other type of aircraft must not
be operated while such aircraft are airborne (not touching the ground). When any aircraft leaves the
ground, all cellular telephones on board that aircraft must be turned off.
Bendix/King, Inc. does not endorse using unapproved cellular telephone equipment in flight, and takes no
responsibility for the user’s action.
Bendix/King does not guarantee compatibility with personal cellular telephones.
2.4.10 Public Address Mode
By pressing the Mute and SPR pushbuttons at the same time, the KMA 30 will be placed into public address (PA) mode. In this mode, the pilot will be talking over the cockpit speaker when he presses his PTT
switch. Copilot will still continue on the selected COM radio.
When the discrete Output is enabled, J2 Pin 19 will go low when in PA mode, providing a logic level that
can be used to incorporate a speaker-switching scheme. This 50 mA circuit (10Ω Z) can control a switching means such as a relay that would transfer the speaker output amplifier from the cockpit speaker to
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