Nat InterMUSIC AA83-001 User manual

SPECIAL NOTICE
Ownership of this product has been transferred to Cobham Aerospace Communication
from Anodyne Electronics Manufacturing (AEM) and Northern Airborne Technology
(NAT). Cobham is responsible for all matters related to this product, including sales,
support and repair services.
Please note the transition to convert product manuals and supporting documentation is
an ongoing process and is being addressed on an ‘as needed’ basis.
All references to AEM and NAT product part numbers (and associated images) are
equivalent to Cobham product part numbers.
Contact info:
Cobham Aerospace Communication,
6400 Wilkinson Drive, Prescott, Arizona, 86301.
Telephone: [phone] or refer to the following website:
www.wulfsberg.com for more information.
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PROPRIETARY NOTICE
PROPRIETARY STATEMENT
This document contains confidential and proprietary information and is the property of Chelton Avionics, Inc., a subsidiary of
Cobham plc. It is to be provided in confidence on the condition that by receipt it is not reproduced or copied in whole or in part, or
used to furnish such information to others, or to make use of it for purposes other than specified by the Usage Statement. The
previous statement shall not apply to the extent that such statement violates any federal or state laws requiring such information to
be made available to the public. Non-current versions of this document must be returned to Chelton Avionics, Inc. or destroyed or
shredded in a manner that renders the document completely and totally unusable and illegible.
EXPORT CONTROLS STATEMENT
The technical data within this document is controlled for export under the export administration regulations (EAR), 15 CFR PARTS
730-774, violations of these laws may be subject to fines and penalties under the export administration act.
FCC STATEMENT
This device complies with part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including
interference that may cause undesired operation. Before operating the products covered by this document, read the operating
instructions for safe usage. Regarding Part 15.21, changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
USAGE STATEMENT
The data in this document was developed only to maintain systems and/or parts manufactured by, manufactured for, or approved
by Cobham. The data may not be applicable to any other systems and/or parts, regardless of their apparent similarity to systems
and/or parts manufactured by, manufactured for, or approved by Cobham. Do not rely, in any way, on data in this document to
maintain or otherwise support systems and/or parts that were not manufactured by, manufactured for, or approved by Cobham,
without evidence that the Federal Aviation Administration or other regulatory agency has determined that the data in this document
is valid for such use. This document shall not be used for the development, manufacture, service, support, modify, overhaul or
obtain FAA or any other regulatory approval of any other products than are specified within.
Cobham assumes no liability whatsoever, whether contractual, warranty, tort or otherwise, for unauthorized work not performed in
accordance with Chelton Avionics, Inc. approved procedures.
DOCUMENT COPYRIGHTS
Recipients agree to hold the contents of this document in confidence and agree to use only for the recipients internal purposes to
maintain the referenced equipment. This document and its contents shall not be used, reproduced, transmitted, or distributed for
any other purpose. The recipient also agrees to not disclose, share, or copy for distribution any of the contents of this document to
any third party except as provided by written permission from Chelton Avionics, Inc. Copy or disclosure of the contents of this
document by anyone without the written approval of Chelton Avionics, Inc. may result in criminal or civil liability.
DISCLAIMER
The content of this document has been reviewed for accuracy and is believed to be reliable, however no responsibility is assumed
for typographical errors and inaccuracies. Chelton Avionics, Inc. reserves the rights to revise the contents within to improve
accuracy and apply updated information related to design and serviceability without prior notice to users. The latest published
revision is the only version authorized for use.
PROPERTY AND COPYRIGHT STATEMENT
The copyright and ownership of all manuals, drawings, specifications and data as may be provided by Chelton Avionics, Inc. within
this document shall remain the property of Chelton Avionics, Inc.
All other brand and product names are trademarks or registered trademarks of their respective holders.
Copyright© Chelton Avionics, Inc.
All Rights Reserved
Cobham Aerospace
Communications
6400 Wilkinson Drive
Prescott, AZ USA 86301
T: [phone]
F: [phone]
Proprietary Information: Use or disclosure of this data is
subject to the restrictions specified in the introductory
section of this document
These commodities, technology or software are controlled in accordance with the United States Export Administration Regulations, Export Classification
Control Number(ECCN) EAR99. When exporting, diversion contrary to U.S. law is prohibited.

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM09-2
AA83-001 InterMUSIC™
Stereo Intercom System
INSTALLATION AND OPERATION MANUAL
REV 4.10 October 20, 2004
Northern Airborne Technology Ltd.
1925 Kirschner Road
Kelowna, BC, Canada.
V1Y 4N7
Telephone [phone]
Facsimile [phone]
Copyright 2004 by Northern Airborne Technology
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SM09-2 Rev. 4.10 AA83-001 InterMUSIC™ Stereo Intercom System Manual
Oct 20, 2004 Page ii
ENG-FORM: 820-0109.DOT
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Periodically NAT will release manual amendments. In order to maintain the most
accurate and up to date manual these amendments should be carried out immediately
upon receipt and recorded on the following amendment record.
AMENDMENT RECORD
Amendment
Number
Amendment
Date
Section(s)
Changed
Date
Entered
Entered By
Insert any Amendment Instruction sheets after this page.
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SM09-2 Rev. 4.10 AA83-001 InterMUSIC™ Stereo Intercom System Manual
Oct 20, 2004 Page iii
ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Table of Contents
Section Title Page
1 Description
1.1 Introduction 1-1
1.2 Purpose of Equipment 1-1
1.3 Features 1-1
1.3.1 Stereo & Intercom Special Features 1-1
1.3.2 Communication Functions 1-1
1.4 Specifications 1-2
1.4.1 Electrical Specifications 1-2
1.4.2 Physical Specifications 1-3
1.4.3 Environmental Specifications 1-3
2 Installation
2.1 Introduction 2-1
2.2 Unpacking and Inspection 2-1
2.2.1 Warranty 2-1
2.3 Installation Procedures 2-1
2.3.1 Warnings 2-1
2.3.2 Cautions 2-2
2.3.3 Cabling and Wiring 2-2
2.3.4 Installation Notes 2-2
2.3.5 Adjustments 2-3
2.3.6 Setting Music Input Compatibility 2-4
2.3.7 Mechanical Installation 2-4
2.3.8 Post-Installation Checks 2-5
2.3.9 Final Check 2-6
2.4 Continued Airworthiness 2-7
2.5 Accessories Required 2-7
2.6 Installation Drawings 2-7
3 Operation
3.1 Introduction 3-1
3.2 General 3-1
3.2.1 Stereo & Intercom Special Features 3-1
3.2.2 Communication Functions 3-1
3.3 Controls and Indicators 3-2
3.3.1 ICS VOL/VOX 3-2
3.3.2 MUSIC VOL/COPILOT VOX 3-2
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SM09-2 Rev. 4.10 AA83-001 InterMUSIC™ Stereo Intercom System Manual
Oct 20, 2004 Page iv
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Section Title Page
3.3.3 Annunciator 3-2
3.3.4 VOX Operation 3-3
3.3.5 Mode Switch 3-3
3.3.6 Automatic Fail-safe 3-4
3.3.7 Muting Explanation 3-5
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SM09-2 Rev. 4.10 AA83-001 InterMUSIC™Stereo Intercom System Manual
Section 1 Description
1.1 Introduction
This manual contains information on the AA83-001 InterMUSIC™. All derivative products
will be covered by manual supplements, which can be obtained from NAT as required.
Information in this section consists of purpose of equipment, features and specifications.
1.2 Purpose of Equipment
The AA83-001 is a 4-place stereo voice-activated intercom that provides full intercom
capabilities for the pilot and copilot and two passengers (PAX). It provides
entertainment and communication audio in full stereo to all four headsets, and
transceiver control for both the pilot and co-pilot. The InterMUSIC™family of stereo
intercoms allows several installation configurations - from single unit systems, to fully
independent stations for the pilot, copilot and passengers. For expanded systems, tie
line connections are compatible with other NAT systems including AA80, AA82, AMS4x
and AA9x series units.
1.3 Features
1.3.1 Stereo & Intercom Special Features
The stereo music audio is muted during transmit or intercom operation and when radio
receive audio is detected, permitting greater intelligibility of incoming transmissions.
The AA83-100 muting depth adjustment ranges from complete music muting to gentle
background music on command, with a fast attack and slow level return for optimum
user comfort. Each microphone is individually gated, for the best possible noise
performance during VOX operation. A front panel annunciator allows easy visual
setting of the VOX threshold, and also indicates transmit operation.
1.3.2 Communication Functions
The AA83-001 provides full boom-mic transmit and ICS functions for the pilot and co-pilot,
and provides ICS and radio monitor operation for two additional passengers. Pilot priority
on transmit and pilot isolation (direct connection to the aircraft radio system) are standard
features on all NAT intercom systems. The AA83-001 can support PTT ICS operation for
all users, and can be wired to cyclic/yoke switches for both TX and ICS functions.
The balance adjustment pots permit signals to be shifted in the user's acoustic listening
space so that tower transmissions appear to come from one area, and intercom from
another. This greatly aids in signal recognition and more accurately reproduces a
natural listening environment for the flight crew.
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AA83-001 InterMUSIC™Stereo Intercom System Manual SM09-2 Rev. 4.10
1.4 Specifications
1.4.1 Electrical Specifications
Input Power: +11 to +32 Vdc. Nominal 14/28 Vdc systems
Supply Current: 0.4 A max. (full output power, all users)
Headset Power: Typical 100 mW into each side each headset
(300 Ωear element)
4 headsets total
Total maximum power 400 mW per channel
Indicators: Transmit (Green LED)
ICS (Amber LED)
Inputs: 4 microphones 'carbon equivalent'
250 mVrms for full output
150 Ωinput impedance
2 TX keylines Active ground, for Pilot & Copilot
4 ICS keylines Active ground, for all users
2 music inputs Compatible, left & right
Configurable for either Walkman™/Discman™
phones compatible (3 Vp-p), or Line Output
compatible (100-500 mV @ 10 kΩ)
1 Aircraft radio input
2.5 Vrms for full output
1 kΩinput impedance
1 bi-directional ICS Tie Line
1 Vp-p for full output
2.2 kΩinput impedance
Outputs: 4 aircraft stereo headsets (300 Ω/side)
Not designed for 8 Ωheadsets
1 radio microphone output to aircraft audio
panel
1 TX keyline output (hard ground for TX).
Logic: TX, active ICS, and incoming Receive Audio all
mute the music channel (Muting depth
adjustable)
Fast attack, slow return of music signal
Pilot TX priority
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SM09-2 Rev. 4.10 AA83-001 InterMUSIC™Stereo Intercom System Manual
1.4.2 Physical Specifications
Dimensions excluding front panel:
Height 1.30" (33.0 mm)
Length 5.60" (142.2 mm)
Width 2.60" (66.0 mm)
Weight 0.6 lbs (283.5 g) excluding external hardware
Mounting Horizontal or vertical through-panel mounting
1.4.3 Environmental Specifications
Temperature:
Operating -40°C to +70°C
Storage -55°C to + 85°C (survival)
Altitude 25,000 feet
Humidity 95% Non-condensing
Shock DO-160C category "P", panel mounting 6 G.
End of section 1
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SM09-2 Rev. 4.10 AA83-001 InterMUSIC™ Stereo Intercom System Manual
Section 2 Installation
2.1 Introduction
Information in this section consists of: unpacking and inspection procedures, installation
procedures, post-installation checks, and installation drawings.
2.2 Unpacking and Inspection
Unpack the equipment carefully and locate the warranty card. Inspect the unit visually
for damage due to shipping and report all such claims immediately to the carrier
involved. Note that each unit should have the following:
- AA83-001 InterMUSIC™
- Warranty Card
- Operator’s Manual
- Release certification
- Installation kit (Section 2.5)
Verify that all items are present before proceeding and report any shortage immediately
to your supplier.
2.2.1 Warranty
Complete the warranty card information and send it to NAT when the installation is
complete. If you fail to complete the warranty card, the warranty will be activated on
date of shipment from NAT.
Note: An appropriately rated facility, e.g. Certified Aircraft Repair Station, must install this
equipment in accordance with applicable regulations. NAT Ltd’s warranty is not
valid unless the equipment is installed by an authorized NAT 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 a non-airworthy installation.
2.3 Installation Procedures
2.3.1 Warnings
Do not bundle any lines from this unit with transmitter coax lines. Do not bundle any
logic, audio, or DC power lines from this unit with 400 Hz synchro wiring or AC power
lines. Do not position this unit next to any device with a strong alternating magnetic field
such as an inverter, motor or blower, or significant audio interference will result.
Oct 20, 2004 Page 2-1
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SM09-2 Rev. 4.10 AA83-001 InterMUSIC™ Stereo Intercom System Manual
2.3.2 Cautions
In all installations, use shielded cable exactly as shown and ground as indicated.
Significant problems may result from not following these guidelines.
All audio installations can be seriously degraded by incorrect wiring and shielding, and
may result in abnormal cross-talk, hum and ground-loop noise. Be especially careful
with all microphone wiring and Tie Line wiring, as these lines carry the lowest level
signals in the aircraft.
All microphone and headset jacks should be electrically isolated from the airframe or
significant ground loop noise may result.
2.3.3 Cabling and Wiring
All unshielded wire should be to MIL-W-22759 or equivalent. For shielded wire
applications, use Tefzel MIL-C-27500 shielded wire with solder sleeves (for shield
terminations) to make the most compact and easily terminated interconnect. Follow the
wiring diagrams in Section 2.6 as required.
Allow 3 inches from the end of the wire to the shield termination to allow the hood to be
easily installed. Note that the hood is a ‘clamshell’ hood, and is installed after the wiring
is complete. Aircraft harnessing should permit the unit to be lowered from the panel for
easy access to all side adjustments. Do NOT mount the unit until all adjustments have
been carried out.
All wiring should be at least 22 AWG, except power and ground lines, which should be
at least 20 AWG. Ensure that the ground connection is clean and well secured, and
that it shares no path with any electrically noisy aircraft accessories such as blowers,
turn and bank instruments or similar loads. Power to this unit must be supplied from a
separate breaker (1/2 A) or fuse (1/2 A fast), and not attached to any other existing
breaker without additional protection. The correct fuse is included with the AA83-001.
2.3.4 Installation Notes
All AA95/AMS4X Audio Controllers used with the AA83-001 must have the ICS Tie Line
and Gain Modifications installed. This will only be a concern on Audio Controllers with
S/N 1918 or before. If the AA83-001 is used with a second unit such as an AA82, you
may wish to install the 2.2 kΩresistor shown in the installation drawing. This is used to
equalize ICS Tie Line loading when changing from the tie to split connections. If you
are not familiar with Tie Line techniques, request the installation bulletin from NAT
covering Tie Line theory and practice.
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SM09-2 Rev. 4.10 AA83-001 InterMUSIC™ Stereo Intercom System Manual
2.3.5 Adjustments
The unit ships from the factory with all internal adjustments set to the normal test levels.
Once installed in the aircraft, it may be desirable to change some of these settings to
best suit the local operating environment.
CAUTION
Before performing the following adjustments ensure the aircraft radio’s
volume control is set to produce 2.5 Vrms ±10 % at the input to the
AA83-001, or the mute functions may not operate correctly.
The internal adjustments are located along the sides of the unit and are as follows:
2.3.4.1 ICS, RX, and MUSIC BAL.
These potentiometers are used to adjust the headset stereo balance.
Note: The balance adjustment pots permit signals to be shifted in the user's acoustic
listening space so that tower transmissions appear to come from one area, and
intercom from another. This greatly aids in signal recognition and more
accurately reproduces a natural listening environment for the flight crew.
2.3.4.2 ICS and MUSIC BASS
These potentiometers are used to adjust the amount of bass audio to the headsets.
Rotating ccw will lower the bass level, and cw will raise it.
2.3.4.3 RX VOL
To reduce the receive audio volume, rotate this potentiometer ccw, and to increase the
volume, rotate it cw.
2.3.4.4 MUSIC MUTE
The music mute level can be adjusted using this potentiometer.
Oct 20, 2004 Page 2-3
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SM09-2 Rev. 4.10 AA83-001 InterMUSIC™ Stereo Intercom System Manual
2.3.6 Setting Music Input Compatibility
The AA83-001 (S/N 1091and up) can be configured to be Low-Z or High-Z circuits by
two internal jumpers (J103 and J104), which can be accessed by removing the cover
and top PCB from the AA83-001. The AA83-001 is normally shipped from the
factory as a Low-Z version.
2.3.5.1 Jumper Adjustment
Refer to Component Locator AA83\001\924-0 in Section 6 of the AA83-001
Maintenance Manual. If any further information is required, contact the Product Support
department at NAT Ltd.
Note: The AA83-001 is a static sensitive device. Use proper ESD handling procedures
when the cover is removed.
The two types of music inputs are configured by the position of jumpers J103 and J104,
located on the main PCB near the access hole for Q101. Music input type is
determined as follows:
Low Z/Walkman™ compatible J103 and J104 Installed
High Z/Pre-Amp compatible J103 and J104 Removed
To gain access to the jumpers, remove the cover from the AA83-001. Remove the top
PCB by removing three panhead screws and carefully lifting it straight up.
When reassembling the unit ensure the pins and connector are aligned properly before
screwing the PCB down.
2.3.7 Mechanical Installation
The AA83-001 can be installed in a vertical or horizontal attitude directly on the
instrument console, using the AA83-IKC Installation kit (see Section 2.5 for details).
Before the unit is mounted, make all functional tests and trimpot adjustments. Be sure
the harness has enough clearance to permit the unit to be dropped down for re-
adjustment, if needed later. Make sure unit is securely fastened to the panel, and that
the connector locks are tightened before any flight is attempted.
For proper installation, refer to the Drill Template (AA83\001\921-0) and the following
steps:
Note: The mounting nuts on the panel pots should not be removed at any time.
a) After deciding the attitude (vertical or horizontal) of the unit, drill the required
mounting holes in the aircraft panel and insert the AA83-001 from behind the panel.
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SM09-2 Rev. 4.10 AA83-001 InterMUSIC™ Stereo Intercom System Manual
b) Remove the protective plastic film from the black metal faceplate, and position it
with the appropriate legend orientation facing out. Secure with the mounting
screws provided.
Note: Ensure that the aircraft panel is tightly ‘sandwiched’ between the
AA83-001 and the faceplate.
c) Rotate the inner and outer shafts of the ICS VOL / VOX potentiometer fully ccw.
The outer knob may be rotated by hand, but it may be necessary to temporarily
attach the inner ICS knob to facilitate this action. Align the white markers on the
knobs to the LIVE position on the faceplate label. Using a 0.05" Allen key,
tighten the knobs onto the potentiometer shafts.
d) Rotate the shaft of the MUSIC VOL potentiometer fully ccw. Align the white
marker on the knob to the MIN position on the faceplate label. Using a 0.05"
Allen key, tighten the knob onto the potentiometer shaft.
Note: Make sure there is enough clearance between the concentric knobs so
that rotating one does not also move the other. A piece of paper makes a
good spacer when setting up the clearance.
2.3.8 Post-Installation Checks
If any preset requires adjustment, be sure this is carried out before the aircraft leaves,
and that the unit and its mating connector are secured before departure. Make all
required log book entries, electrical load, weight and balance amendments and other
paperwork as required by your local regulatory agency.
2.3.7.1 Voltage/resistance checks
Do not attach the AA83-001 until the following conditions are met.
Check the following:
a) Check P101, pin <1> for +9 to +32 Vdc relative to ground.
b) Check P101, pin <16> for continuity to ground (less than 0.5 Ω).
c) Check P101, pins <11> and <12> for continuity to ground (less than 0.5 Ω) when
the relevant ICS switch is keyed.
d) Check all mic, phone, music, and key lines for shorts to ground or adjacent pins.
Check all key lines for correct operation.
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SM09-2 Rev. 4.10 AA83-001 InterMUSIC™ Stereo Intercom System Manual
2.3.7.2 Power On checks
Install the AA83-001 and power up the aircraft’s systems, and turn on the radios and
accessories required. Verify normal operation of all functions. Refer to Section 3 for
specific operation details.
a) Begin with only the pilot's headset installed, no hand mic. Check for correct radio
operation (both receive and transmit) and ICS operation. Check yoke (or cyclic)
switch action.
b) If there is a music source in the system turn it on and verify that music is heard in
all modes except PLT ISO. Check for proper mute operation.
Note: Unusual buzzes, hums or other background audio may be symptomatic of
multiple grounds or noisy external systems sharing the same wire bundle.
Incorrect jack wiring is a common fault, especially for passenger stations, and
may cause loss of audio, a tone on the headset lines, or other problems.
c) Plug in the copilot's headset. Check for correct radio and ICS operation. Check
pilot's transmit priority. Check yoke or cyclic switch functions, if applicable.
d) Plug in the hand mic (if applicable to the installation), and test for correct
operation in all modes. It must activate the transmitter(s) in all cases.
e) Plug in any remaining headsets, and check for correct ICS operation.
f) To verify proper operation, all functions and levels should be checked in-flight.
Be sure headsets are of good quality and are installed correctly. Unless the AA83-001
has specifically been wired for mono operation NEVER USE MONO AIRCRAFT
HEADSETS in the system, as they will short out one side of the AA83-001 power
amplifier when installed in stereo jacks. This may result in eventual unit failure, which
IS NOT COVERED BY WARRANTY.
2.3.9 Final Check
Fly the aircraft and check levels and operation of all functions. You may wish to change
Bass or Balance controls after flight, depending on how the system performs with
regard to ambient noise.
Upon satisfactory completion of all performance checks, make the required log
entries and complete the necessary Regulatory Agency paperwork before
releasing the aircraft for service.
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SM09-2 Rev. 4.10 AA83-001 InterMUSIC™ Stereo Intercom System Manual
2.4 Continued Airworthiness
Maintenance of the AA83-001 is ‘on condition’ only. Periodic maintenance of this
product is not required.
2.5 Accessories Required
Installation kit p/n AA83-IKC is required to complete the installation. The kit consists of
the following:
Quantity Description NAT Part #
1 D-min 44 Pin Female Crimp Installation Kit D44SL-IKC
1 AGC 1/2A Fuse 23-00-005
3 5/8” 6-32 Black Pan Head Screw 25-11-427
1 Fluted 1/8” ICS Knob 40-21-ICS3
1 Fluted 1/8” Music Knob 40-21-MUS3
1 Hole Overlay 43-10-083
1 Rectangular Faceplate 50-04-831
The NAT Part #: D44SL-IKC consists of:
Quantity Description NAT Part #
1 D-min 44 Socket Housing 20-20-044
44 Mini D Crimp Socket 20-26-703
1* Jack Screw Set 20-27-002
1* Lock Clip Set 20-27-004
1 25 pin Connector Hood 20-29-026
* Use as required.
2.6 Installation Drawings
DRAWING REV. DESCRIPTION TYPE
AA83\001\302-0 1.00 InterMUSIC System Block Diagram
AA83\001\403-0 1.20 InterMUSIC Stereo Intercom Interconnect
AA83\001\405-0 1.00 InterMUSIC Stereo Intercom Connector Map
AA83\001\921-0 1.00 Drill Template Mounting Plate
Section 2 ends after these Drawings
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These commodities, technology or software are controlled in accordance with the United
States Export Administration Regulations, Export Classification Control Number(ECCN)
EAR99. When exporting, diversion contrary to U.S. law is prohibited.

Confidential and Proprietary to NAT
These commodities, technology or software are
controlled in accordance with the United States
Export Administration Regulations, Export
Classification Control Number(ECCN) EAR99.
When exporting, diversion contrary to U.S. law is
prohibited.

These commodities, technology or software are controlled in accordance with the United
States Export Administration Regulations, Export Classification Control Number(ECCN)
EAR99. When exporting, diversion contrary to U.S. law is prohibited.

These commodities, technology or software are controlled in accordance with the United
States Export Administration Regulations, Export Classification Control Number(ECCN)
EAR99. When exporting, diversion contrary to U.S. law is prohibited.