Northern Airborne Technology AMS43 User Manual

Installation and Operation Manual

AMS43

Single Channel Audio Controller

SM59

ISSUE 4.01

Northern Airborne Technology Ltd.

1925 Kirschner Road

Kelowna, BC, Canada.

V1Y 4N7

Telephone [phone]

Facsimile [phone]

Issued on the authority of Northern Airborne Technology Ltd.

Copyright 2003

AMS43 Single Channel Audio Controller
SM59 Installation and Operation Manual

IMPORTANT INFORMATION

This manual has been produced to provide information unique to the AMS43 Single

Channel Audio Controller. Some of this information has been published previously in the

SM01 Service manual (AA90/AMS40 Series Audio Controllers).

Earlier versions of the AMS43 may not be covered by the information in this manual.

Please refer to SM01, or contact the Technical Support Department at NAT Ltd.

Installation and Operation Manual Page ii

ENG-FORM: 820-0114.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

AMS43 Single Channel Audio Controller
SM59 Installation and Operation Manual

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.

ISSUE/REVISION RECORD

Manual Issue

Number

4.00 N/A N/A Nov 10, 2003

Section

Revision Number

Revision Description Issue Date

4.01 Section 1 Rev: 1.00
Section 2 Rev: 1.00

Rewritten in latest format.

Newest drawings added.

Sep 23, 2008

Section 3 Rev: 1.00

Installation and Operation Manual Page iii

ENG-FORM: 820-0114.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

AMS43 Single Channel Audio Controller
SM59 Installation and Operation Manual

Table of Contents

Section Title Page

1. Description

1.1 Introduction 1-1

1.2 Product Description 1-1

1.3 Design Features 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 Continued Airworthiness 2-1

2.4 Installation Procedures 2-1

2.4.1 Warnings 2-1

2.4.2 Cautions 2-2

2.4.3 Cabling and Wiring 2-2

2.4.4 Post Installation Checks 2-2

2.5 Adjustments and Connections 2-3

2.5.1 Left Side panel adjustments 2-4

2.5.2 Right Side Panel Adjustments 2-4

2.5.3 In-line PTT Drop Cords 2-4

2.6 Accessories Required But Not Supplied 2-6

2.7 Installation Drawings 2-7

3. Operation

3.1 Introduction 3-1

3.2 General Information 3-1

3.3 Controls and Indicators 3-1

3.3.1 Receive Audio Select Switches 3-1

3.3.2 Transmit Selector Switch 3-2

3.3.3 ICS Functions 3-3

3.4 Emergency Operation 3-4

3.5 Audio Alerting Functions 3-4

3.5.1 Direct Audio 3-4

3.5.2 Internal Alerting 3-4

Installation and Operation Manual Page iv

ENG-FORM: 820-0114.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

AMS43 Single Channel Audio Controller
SM59 Installation and Operation Manual

Section 1 Description

1.1 Introduction

Information in this section consists of product description, design features and specifications for the
AMS43 Single Channel Audio Controller. All derivative product information shall be contained in the
applicable manual supplement, which may be obtained from NAT as required.

Review all notes, warnings and cautions.

1.2 Product Description

The AMS43 provides control of aircraft audio, allowing selection of transmit (TX) and receive (RX) audio,
LIVE, KEYED, or voice activated (VOX) intercom, interface for an additional hand-held transmit
microphone (hand mic), and pilot isolation/emergency (ISO/EMR) operation.

TX and PA functions are controlled with a single rotary switch. RX audio, intercom (ICS) operations and
tape audio are controlled with toggle switches. RX volume, ICS volume and ICS VOX squelch are
individually adjusted with rotary controls. Sidetone (S/T) level is adjustable internally.

1.3 Design Features

The AMS43 is a Dzus rail mounted unit with a backlit faceplate. Transceiver interfacing is accomplished
through directly switched microphones. To ensure maximum radio compatibility, it has a ground­referenced keyline that does not incorporate diodes or other steering components.

Independent control is provided for S/T, ICS audio, and RX audio.
Boom mic support is provided for the pilot and co-pilot, with both ICS and TX functions via cyclic or yoke

switching. Live (Hot Mic) and VOX ICS allow immediate transmission without additional control pan el
switching, with immediate return to ICS operation on completion. The ICS function is achieved using
dynamic noise reduction and active filtering. This provides the clearest possible ICS audio under high
ambient noise conditions by rejecting airframe and wind noise, and passing only voiceband information.

All audio, except the S/T of the radio in use and DIRECT AUDIO 2 input signals, is muted during TX for
clarity. ICS operation allows TX during any ICS mode by using the TX push-to-talk (PTT) switch.

All external interconnect, switches and relay contacts are gold plated for maximum reliability. Switches
and relays are sealed. G10-FR flame-retardant circuit boards are postcoated for maximum moisture
resistance and corrosion prevention.

Relays are sealed, high vibration rated (50g shock), dry nitrogen filled units.

Section 1 Rev: 1.00 Issue 4 Page 1-1

ENG-FORM: 800-0113.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

AMS43 Single Channel Audio Controller
SM59 Installation and Operation Manual

1.4 Specifications

1.4.1 Electrical Specifications

Input Power 27.5 Vdc Nominal 0.50 A Max.
Lighting 27.5 Vdc @ 160 mA
Alert Power 27.5 Vdc Nominal 150 mA Max.
Input Signals:

Quantity 13 receive channels
7 mic channels
1 ICS tie channel
2 direct channels

Audio level 2.5 Vrms for receiver inputs

0.25 Vrms for mic inputs

0.34 Vrms for ICS tie input

2.5 Vrms for direct audio inputs
Impedance 1 k Ω ±10% for receive inputs

1 k Ω ±10% for mic inputs

1.8 k Ω ±10% for ICS tie input

1.3 k Ω ±10% for Direct Audio1 input
100 Ω ±10% for Direct Audio 2 input

Circuitry Type All are single ended inputs.
Coupling <-50 dB
Key lines Pilot & copilot transmit PTT

Rear hand mic transmit PTT
Pilot & copilot ICS PTT
3 Alerts - active low

Output Signals:

Quantity 6 Headset outputs
6 Transmitter mic outputs
5 Transmitter keyline outputs

Rated level:

Headset 7.7 Vrms or 100 m W (20 dBm) into 600 Ω
Direct Audio1 10 mW (10 dBm) into 600 Ω
Direct Audio 2 0.1 mW (-10 dBm) 0.25 Vrms into 600 Ω

Alert 90 mVrms ±10% into 600 Ω
Impedance 65 Ω Max
Circuitry Type Single-ended, except for phones, which are balanced.
Freq. Response:

Sidetone <3 dB from 650 Hz to 1750 Hz

Receive inputs <3 dB from 500 Hz to 2200 Hz

Section 1 Rev: 1.00 Issue 4 Page 1-2

ENG-FORM: 800-0113.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

AMS43 Single Channel Audio Controller
SM59 Installation and Operation Manual

Intercom <3 dB from 550 Hz to 2400 Hz

Alert 1 1.5 kHz ±20%

Alert 2 Same as Alert 1 but swept @ 2 cycles/sec

Alert 3 Approx. same as Alert 2 but on for 2 sec

Distortion <10% THD @ rated power output

Audio Noise Level >50 dB down from rated output (no signal)

Coupling <-50 dB

Output Regulation at 400%

and 75% of rated load.

Annunciators Green LE D w i ll li g h t fo r tr a n s mi t op e r at i o n

1.4.2 Physical Specifications

Height 1.90 inches (48.3 mm)

Depth 6.82 inches (173.2 mm)

Width (behind panel) 5.00 inches (127.0 mm)

Weight 2.1 lbs. (955 g)

Mounting Dzus rail

Faceplate Engraved acrylic edge lit panel

Material/Finish Chassis & cover are 5052-H32 brushed aluminum with

Connectors Male 50 pin & 37 pin D-submin connectors with slide locks

<10% distortion

chromate conversion finish

and <3 dB max of rated output power

1.4.3 Environmental Specifications

DO-160C Env. Cat. B1-CANXXXXXXABABBBBXXX

Operating Temperatures -20 °C to +55 °C

Survival Temperatures -55 °C to +85 °C

Vibration/Shock DO-160C Cat. N

Humidity 95%

Altitude 25,000 ft. Max

Section 1 ends

Section 1 Rev: 1.00 Issue 4 Page 1-3

ENG-FORM: 800-0113.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

AMS43 Single Channel Audio Controller
SM59 Installation and Operation Manual

Section 2 Installation

2.1 Introduction

Information in this section consists of unpacking and inspection procedures, installation procedure s, po st­installation checks and installation drawings for the AMS43 Single Channel Audio Controller.

Review all notes, warnings and cautions.

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. Check that all items listed below
are present before proceeding and report any shortage immediately to your supplier:

- Warranty Card

- Operators Manual

- Certificate of Conformity or Release Certification

2.2.1 Warranty

All Northern Airborne Technology Ltd. products are warranted for 2 years from date of installation by an
authorized NAT dealer, to be free of defects in workmanship or performance. This warranty covers all
materials and labour, but is exclusive of any transport to deliver the defective unit to and from NAT or its
designated warranty repair center, or any labour to remove or re-install the defective unit in the aircraft.
Contact NAT for any questions regarding this warranty, its applicability to your units and/or for return
authorization. NAT is the final arbitrator concerning warranty administration. Units which have been
physically damaged, burned, immersed in water or otherwise abused beyond the scope of normal use will
not be considered for warranty. WARRANTY IS VOID UNLESS THE PRODUCT IS INSTALLED BY AN
AUTHORIZED NAT DEALER. Product for which a warranty card is not returned shall be warranted from
date of manufacture.

2.3 Continued Airworthiness

Maintenance of the AMS43 Single Channel Audio Controller is ‘on condition’ only. Periodic maintenance
of this product is not required.

2.4 Installation Procedures

2.4.1 Warnings

WARNING:

High volume settings can cause hearing damage.

Set the headset volume control to the minimum volume setting prior to

conducting tests, and slowly increase the headset volume to a

comfortable listening level.

Section 2 Rev: 1.00 Issue 4 Page 2-1

ENG-FORM: 805-0116.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.