Anodyne Electronics Manufacturing AA83-001 User manual

SPECIAL NOTICE
This product is now licensed to Anodyne Electronics Manufacturing (AEM) from Northern
Airborne Technology (NAT). AEM 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 NAT product part numbers (and associated images) are equivalent to AEM
product part numbers.
Contact info:
Anodyne Electronics Manufacturing Corp.
#15-1925 Kirschner Road
Kelowna B.C. Canada
V1Y 4N7
Email: [e-mail]
Toll Free: 1-888-763-1088
Phone: [phone]
Fax: [phone]
www.aem-corp.com

CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
INSTALLATION AND OPERATION MANUAL
REV 5.00 April 17, 2012
Anodyne Electronics Manufacturing Corp.
15-1925 Kirschner Road
Kelowna, BC, Canada.
V1Y 4N7
Telephone [phone]
Facsimile [phone]
Website: www.aem-corp.com
© 2012 Anodyne Electronics Manufacturing Corp. (AEM),
All Rights Reserved
SM09-2
AA83-001
InterMUSIC™ Stereo Intercom System
Serial No. 2938 and below

AA83-001 InterMUSIC™Stereo Intercom System
SM09-2 Installation and Operation Manual
Installation and Operation Manual Page ii
ENG-FORM: 820-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
COPYRIGHT STATEMENT
© 2012 Anodyne Electronics Manufacturing Corp. (AEM), All Rights Reserved
This publication is the property of AEM and is protected by Canadian copyright
laws. No part of this document may be reproduced or transmitted in any form or
by any means including electronic, mechanical, photocopying, recording, or
otherwise, without the prior written permission of AEM.

AA83-001 InterMUSIC™Stereo Intercom System
SM09-2 Installation and Operation Manual
Installation and Operation Manual Page iii
ENG-FORM: 820-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
Prepared By:
Checked By:
Approved By:
The status of this installation and operation manual is controlled by issue shown on the title page. The
status of each section is controlled by revision shown in the footer of each page. All revisions affecting
sections of this manual have been incorporated into the latest issue.
AEM MANUAL REVISIONS
Section
Revision Number
Revision Description
Issue Date
All Rev 5.00 Updated template and d
rawings
April 17
, 2012
Tony Pearson
Designer
A
pr 17, 2012
Loen Clement
Designer
May 24/12
Tom Betzelt
Product Support
Manager
May 28, 2012

AA83-001 InterMUSIC™Stereo Intercom System
SM09-2 Installation and Operation Manual
Installation and Operation Manual Page iv
ENG-FORM: 820-0100.DOTX
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Table of Contents
Section Title Page
1.0 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
2.0 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 2-1
2.3.3 Cabling and Wiring 2-2
2.3.4 Installation Notes 2-2
2.3.5 Adjustments 2-2
2.3.6 Setting Music Input Compatibility 2-3
2.3.7 Mechanical Installation 2-4
2.3.8 Post-Installation Checks 2-4
2.3.9 Final Check 2-5
2.4 Continued Airworthiness 2-6
2.5 Accessories Required 2-6
2.6 Installation Drawings 2-6
3.0 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
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

AA83-001 InterMUSIC™Stereo Intercom System
SM09-2 Installation and Operation Manual
April 17, 2012 Rev: 5.00 Page 1-1
ENG-FORM: 800-0100.DOTX
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Section 1.0 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 AEM 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, providing full intercom capabilities for pilot, co-pilot
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,
co-pilot and passengers. For expanded systems, tie line connections are compatible with other AEM 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 AA83-001 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
AEM 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 an more accurately reproduces a natural listening environment for the flight crew.

AA83-001 InterMUSIC™Stereo Intercom System
SM09-2 Installation and Operation Manual
April 17, 2012 Rev: 5.00 Page 1-2
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1.4 Specifications
1.4.1 Electrical Specifications
Input Power +11 to +32 Vdc. Nominal 14/28 Vdc systems
Supply Current 0.4A max. (full output power, all users)
Headset Power: Typical 100 mW into each side each headset
(300Ωear element)
4 headsets total
Total maximum power 400 mW per channel
Indicators: Transmit (Green LED)
(ICS (Amber LED)
Inputs: 4 Microphone ‘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
2.5Vrmsforfulloutput
1kΩinput impedance
1 bi-directional ICS Tie Line
1Vp-pforfulloutput
2.2kΩinput 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

AA83-001 InterMUSIC™Stereo Intercom System
SM09-2 Installation and Operation Manual
April 17, 2012 Rev: 5.00 Page 1-3
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1.4.2 Physical Specifications
Dimensions excluding front panel:
Height 1.30” (33.0 mm) max.
Depth 5.60” (142.2 mm) max
Width 2.60” (66.0 mm) max
Weight 0.60 lbs (283.5g) 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
Altitude 25,000 feet
Humidity 95% Non-condensing
Shock DO-160C category “P”, panel mounting 6 G.
End of Section 1.0

AA83-001 InterMUSIC™ Stereo Intercom System
SM09-2 Installation and Operation Manual
April 17, 2012 Rev: 5.00 Page 2-1
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CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
Section 2.0 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. 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™
- Product Information Card
- 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
All Anodyne Electronics Manufacturing Corp. (AEM) products are warranted for 2 years. See the website
www.aem-corp.com/warranty for complete details.
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.
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.

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SM09-2 Installation and Operation Manual
April 17, 2012 Rev: 5.00 Page 2-2
ENG-FORM: 805-0100.DOTX
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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 k:resistor 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 AEM covering Tie
Line theory and practice.
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 r10 % at the input to the AA83-001, or the mute
functions may not operate correctly.

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April 17, 2012 Rev: 5.00 Page 2-3
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CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
The internal adjustments are located along the sides of the unit and are as follows:
2.3.5.1 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.
2.3.5.2 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.
2.3.5.3 RX VOL
To reduce the receive audio volume, rotate this potentiometer ccw, and to increase the volume, rotate it cw.
2.3.5.4 MUSIC MUTE
The music mute level can be adjusted using this potentiometer.
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.
2.3.6.1 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 AEM Corp.
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

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SM09-2 Installation and Operation Manual
April 17, 2012 Rev: 5.00 Page 2-4
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CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
To gain access to the jumpers, remove the cover from the AA83-001. Remove the top PCB by removing
three pan-head 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.
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.

AA83-001 InterMUSIC™ Stereo Intercom System
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April 17, 2012 Rev: 5.00 Page 2-5
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CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
2.3.8.1 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 :).
c) Check P101, pins <11> and <12> for continuity to ground (less than 0.5 :) 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.
2.3.8.2 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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April 17, 2012 Rev: 5.00 Page 2-6
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CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
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 AEM 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 AEM Part #: D44SL-IKC consists of:
Quantity Description AEM 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
2.00
InterMUSIC Stereo Intercom
Interconnect
AA83\001\405-0
2.00
InterMUSIC Stereo Intercom
Connector Map
AA83\001\921-0
1.00
Drill Template
Mounting Plate
Section 2.0 ends following the above documents

Confidential and Proprietary to NAT

Confidential and Proprietary to NAT

AA83-001 InterMUSIC™ Stereo Intercom System
SM09-2 Installation and Operation Manual
April 17, 2012 Rev: 5.00 Page 3-1
ENG-FORM: 806-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
Section 3.0 Operation
3.1 Introduction
Information in this section consists of the functional and operational procedures for the AA83-001
InterMUSIC™stereo intercom.
3.2 General
The AA83-001 InterMUSIC™is a stereo intercom system that supports a pilot, copilot and two
passengers. It provides entertainment and communication audio in full stereo to all four headsets, and
transceiver control for both the pilot and copilot. The InterMUSIC™family of stereo intercoms allows
several installation configurations from single unit systems, to fully independent stations for the pilot,
copilot and passengers. Tie Line connections are compatible with other AEM systems including AA82,
AMS40 and AA95 series units for expanded systems.
3.2.1 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 AA83-001 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.
3.2.2 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 AEM 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.

AA83-001 InterMUSIC™ Stereo Intercom System
SM09-2 Installation and Operation Manual
April 17, 2012 Rev: 5.00 Page 3-2
ENG-FORM: 806-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
3.3 Controls and Indicators
3.3.1 ICS VOL/VOX
The ICS VOL/PILOT VOX control is a fluted concentric rubber knob on the left side of the front panel.
The inner (front) knob is the ICS VOL control, which is used to set Intercom volume. It is at minimum volume
when fully counter-clockwise (ccw). As the knob is rotated clockwise (cw), the ICS volume for crew and
PAX increases. The ICS is muted during transmit operations.
The outer (rear) knob is the PILOT VOX control. For full information on VOX operation, see section 3.3.4.
3.3.2 MUSIC VOL/COPILOT VOX
The MUSIC VOL control is a fluted concentric rubber knob on the right side of the front panel.
The inner (front) knob is the MUSIC VOL control, which is used to set normal music volume. The volume is
at minimum when fully counter-clockwise (ccw), and as the knob is rotated clockwise (cw), the volume
increases. Music is muted during transmit operations.
The outer (rear) knob is the COPILOT VOX control. For full information on VOX operation, see section
3.3.4.
3.3.3 Annunciator
The front panel annunciator is a bi-colour LED that shows intercom status.
If the LED is illuminated green, it indicates transmit activity, and if it is red, it indicates VOX activity. For
transmit with sidetone or mic activity, it will illuminate amber. The green LED also indicates a possible
stuck mic if still lit after transmission is concluded.
ICS VOL (Inner)
PILOT VOX (Outer)
MUSIC VOL (Inner)
COPILOT VOX
(Outer)
Mode Switch
Annunciator