Northern Airborne Technology AMS42 User Manual

SM19

AMS42/AMS44 Series

Dual Channel Audio Controllers

INSTALLATION AND OPERATION MANUAL

REV 4.00 November 21, 2003

Northern Airborne Technology Ltd.

1925 Kirschner Road

Kelowna BC, Canada

V1Y 4N7

Telephone [phone]

Facsimile [phone]

Copyright 2003 by Northern Airborne Technology

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM19 Rev. 4.00 AMS42/44 Dual Channel Audio Controller Manual

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

1 Jul 30, 2004 2
2 Feb 15, 2005 Title, 2
3 May 27, 2008 2

Amendment

Date

Section(s)

Changed

Date Entered

Entered By

Performed at Factory

Performed at Factory
Performed at Factory

Insert any Amendment Instruction sheets after this page.

Nov 21, 2003 Page ii

ENG-FORM: 820-0109.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

INSTALL_OPS
MANUAL AMENDMENT

Manual: SM19 (AMS42/44) Amendment #: 3
Document # SM19\Install_Ops\809-0003 Amendment Date: May 27, 2008

The purpose of this amendment is to add the latest drawings to the manual.
Amendment Instructions:

1

2-7 Rev 4.00 Amendment 2 2-7 Rev 4.00 Amendment 3

2

- AMS42\922-0 Rev 1.10
AMS44\905-1 Rev 1.02 AMS44\905-0 Rev 1.03

- AMS44\922-0 Rev 1.10

Remove Drawings (Section 2) Replace or add Drawings (Section 2)

3 Update the Amendment Record sheet at the front of the manual.
4 Insert this page into the manual after the Amendment Record sheet (page ii).

Manual Amendment ends after the following amended pages

Remove Pages Replace With Pages

Amendment # 3 May 27, 2008 Page 1

ENG-FORM: 809-0109.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

INSTALL_OPS
MANUAL AMENDMENT

Manual: SM19 (AMS42/44) Amendment #: 2
Document # SM19\Install_Ops\809-0002 Amendment Date: Feb 15, 2005

The purpose of this amendment is to add a wiring note to the Cautions section of the
manual, to insert the latest wiring specifications, and to add Install Kit information.

Amendment Instructions:

1

Title section page iii Rev 4.00 Title section page iii Rev 4.00 Amendment 2
2-1 and 2-2 Rev 4.00 2-1 and 2-2 Rev 4.00 Amendment 2
2-7 Rev 4.00 2-7 Rev 4.00 Amendment 2

2 Update the Amendment Record sheet at the front of the manual.

3 Insert this page into the manual after the Amendment Record sheet (page ii).

Manual Amendment ends after the following amended pages

Remove Pages Replace With Pages

Amendment # 2 Feb 15, 2005 Page 1

ENG-FORM: 809-0109.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

INSTALL_OPS
MANUAL AMENDMENT

Manual: SM19_AMS42_AMS44 Amendment #: 1
Document # SM19\Install_Ops\809-0001 Amendment Date: Jul 30, 2004

The purpose of this amendment is to add the most recent Installation Drawings to the
manual.

Amendment Instructions:

1 Remove Pages Replace With Pages

2-7 Rev 4.00 2-7 Rev 4.00 Amendment 1

2 Remove Drawings (Section 2) Replace or add Drawings (Section 2)

AMS42\403-0 Rev 1.01 AMS42\403-0 Rev 1.11
AMS42\403-1 Rev 1.10 AMS42\403-1 Rev 1.11
AMS42\403-2 Rev 1.02 AMS42\403-2 Rev 1.11
AMS42\405-0 Rev 1.00 AMS42\405-0 Rev 1.01
AMS44\403-0 Rev 1.01 AMS44\403-0 Rev 1.03
AMS44\403-1 Rev 1.01 AMS44\403-1 Rev 1.03
AMS44\403-2 Rev 1.01 AMS44\403-2 Rev 1.03
AMS44\405-0 Rev 1.01 AMS44\405-0 Rev 1.02

Note: Ensure that all drawings are inserted in the order shown on the latest drawing lists.

3 Update the Amendment Record sheet at the front of the manual.

4 Insert this page into the manual after the Amendment Record sheet (page ii).

Manual Amendment ends after the following amended pages

Amendment # 1 Jul 30, 2004 Page 1

ENG-FORM: 809-0107.DOT

PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM19 Rev. 4.00 AMS42/44 Dual Channel Audio Controller Manual

Table of Contents

Section Title Page

1.0 Description

1.1 Introduction 1-1

1.2 Purpose of Equipment 1-1

1.3 Design Features 1-1

1.3.1 Transmit Functions 1-1

1.3.2 Receive Functions 1-2

1.3.3 ICS Functions 1-2

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

1.5 Unit Nomenclature 1-4

2.0 Installation

2.1 General 2-1

2.2 Unpacking and Inspection 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 Cable and Wiring 2-2

2.5 Adjustments and Connections 2-2

2.5.1 Top panel adjustments 2-3

2.5.2 Right Side Adjustments 2-4

2.5.3 Left Side 2-5

2.5.4 Post-Installation Checks 2-6

2.5.5 Accessories Required But Not Supplied 2-6

2.6 Installation Drawings 2-7

Nov 21, 2003 Page iii

ENG-FORM: 820-0109.DOT Amendment #2 Feb 15, 2005

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM19 Rev. 4.00 AMS42/44 Dual Channel Audio Controller Manual

3.0 Operation

3.1 AMS42 - General Operation 3-1

3.2 AMS42 - Audio Alerting Functions 3-1

3.3 AMS42 - Selection of Transmit Functions 3-2

3.3.1 Transmit Selectors 3-2

3.3.2 Hand Microphone 3-2

3.4 AMS42 - Transceiver Receive Functions 3-3

3.4.1 Receive Selection Switches 3-3

3.4.2 Transceiver Selection Examples 3-3

3.4.3 Volume Controls 3-4

3.4.4 Passenger Receive Audio Selection 3-4

3.4.5 Auxiliary Inputs 3-4

3.5 AMS42 - Intercom Functions 3-4

3.5.1 ICS Modes of Operation 3-5

3.5.2 Passenger ICS Operation 3-5

3.6 AMS42 Mode Control 3-6

3.6.1 Emergency Operation 3-6

3.6.2 Isolation Operation 3-6

3.7 AMS44 - General Operation 3-7

3.8 AMS44 - Audio Alerting Functions 3-7

3.9 AMS44 - Selection of Transmit Functions 3-8

3.9.1 Transmit Selectors 3-8

3.9.2 Hand Microphone 3-9

3.10 AMS44 - Transceiver Receive Functions 3-9

3.10.1 Receive Selection Switches 3-9

3.10.2 Transceiver Selection Examples 3-9

3.10.3 Volume Controls 3-10

3.10.4 Passenger Receive Audio Selection 3-10

3.10.5 Auxiliary Inputs 3-11

3.11 AMS44 - Intercom Functions 3-11

3.11.1 ICS Modes of Operation 3-11

3.11.2 Passenger ICS Operation 3-12

3.12 AMS44 - Mode Control 3-12

3.12.1 Emergency Operation 3-12

3.12.2 Isolation Operation 3-13

Nov 21, 2003 Page iv

ENG-FORM: 820-0109.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM19 Rev. 4.00 AMS42/44 Dual Channel Audio Controller Manual

Section 1.0 Description

1.1 Introduction

This manual contains information on the AMS42 and AMS44 Dual Channel Audio
Controllers.

Information in this section consists of purpose of equipment, features and specifications.

1.2 Purpose of Equipment

The AMS42 and AMS44 are dual channel audio controllers that provide central control
of all aircraft audio. They allow selection of transmit and receive audio, emergency
operation and provide LIVE, KEYED, or VOX intercom. Support for the pilot, copilot and
five passengers is provided as well as left or right side pilot configurations.

The purpose of the AMS42 and AMS44 is to provide centralized control for all audio in
the aircraft. This is accomplished by providing positions for up to five transceivers and
up to eight navaids. Other functions such as external PA interface, boom mic support
for the pilot and copilot, seven place intercom, emergency and ISO operation, two direct
audio inputs and rear hand mic operation are also provided.

1.3 Design Features

The AMS42 and AMS44 can be easily configured at the time of installation for pilot
operation from the left or right side of the controller by selection of internal jumpers and
switches accessible through the top cover. The five passenger positions are also
configurable for left or right side operation.

Both controllers provide independent volume control of S/T (sidetone), ICS (intercom)
and RX (receive) audio for left and right side users.

Both controllers utilize active bandpass filtering for RX and ICS operation for maximum
audio clarity in high ambient noise conditions.

1.3.1 Transmit Functions

Both controllers provide equal transmit capability between left and right sides and
support the use of a hand microphone. The hand mic is internally configured for left or
right side operation, and is connected directly to the selected radio for use during
emergency or equipment failure situations.

Nov 21, 2003 Page 1-1

ENG-FORM: 800-0103.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

AMS42/44 Dual Channel Audio Controller Manual SM19 Rev. 4.00

During transmit operation, the sidetone of the transceiver in use remains enabled while
all other audio, except DIRECT 2, is muted. This function is specific to each ‘side’ of the
audio controller.

Transceiver interfacing is accomplished through directly switched microphones and
ground referenced keylines. To ensure maximum radio compatibility, no diodes or other
steering components are used.

1.3.2 Receive Functions

Selecting a transceiver with the TX (transmit) rotary selector automatically selects the
associated receive audio. The RX inputs are also selected by the 3-position center-off
front panel switches, five on each side of the audio controller – the ‘up’ position selects
the respective navaid input, and the ‘down’ position selects the repective COM.

Two Direct Audio inputs are provided and are configurable for left or right side use.

1.3.3 ICS Functions

LIVE, KEYED or variable VOX ICS operation can be selected from a single control.

The AMS42 and AMS44 use dynamic noise reduction and voice band filtering to provide
the clearest possible ICS audio in high ambient noise conditions.

Transparent ICS for either the pilot or copilot allows immediate transmit operation with
no control panel switching. Return to ICS operation is automatic upon completion of the
TX operation.

Isolation and Emergency modes of operation are provided to remove the pilot(s) from
the intercom bus without interfering with normal passenger ICS.

Both controllers provide an ICS Tie line for multiple controller installations.

1.4 Specifications

1.4.1 Electrical Specifications

Input Power Typically +22 to +32 Vdc at 250 mA
Nominal +28 Vdc

Lighting 160 mA at 28 Vdc.
600 mA at 5 Vdc.

Microphone Requirement ‘Carbon equivalent’ 250 mV into 150 Ω min.
(David Clark M1/DC, M3, M4, M7 recommended)

Page 1-2 Nov 21, 2003

ENG-FORM: 800-0103.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM19 Rev. 4.00 AMS42/44 Dual Channel Audio Controller Manual

Receive Audio Requirement 25 mW into 600Ω

Headset Power 250 mW per channel into 600 Ω

Key Logic Ground seeking for all lines.
‘Hard’ ground outputs to all transceivers.
TX LED on front panel lights when any transmit

key input is low except hand mic.

Cross-Talk De-selected inputs 50 dB min. below full output

Bi-directional ICS Tie Line 340 mVrms for full output

1.6 kΩ input impedance

1.4.2 Physical Specifications

Height 1.88" (47.8 mm) max.

Length 6.77" (172.0 mm) max. from back of mounting

surface and excluding mating connectors

Width 5.75" (146.1 mm) max. front panel

5.00" (127.0 mm) max. rear enclosure

Weight 2.3 lbs (1.04 Kg)

Mounting Standard Dzus Mounting (four fasteners)
Optional Tray Mount

1.4.3 Environmental Specifications

Temperature -20 to +55° C (ambient)

-55 to +85° C (survival)

Altitude 25,000 feet max.

Humidity 95% Non-condensing

Shock 12g (any axis)

Vibration Conforms to DO-160B category ‘P’

Nov 21, 2003 Page 1-3

ENG-FORM: 800-0103.DOT

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AMS42/44 Dual Channel Audio Controller Manual SM19 Rev. 4.00

1.5 Unit Nomenclature

The AMS42/44 series are designed to be generic, fixed attribute audio controllers. For
this reason a limited number of models is available. Custom dual channel audio
controllers based on the AMS42 are renamed AA92H series and units based on the
AMS44 are renamed AA94 series.

The models available are:

AMS42 5 front panel selectable transceivers.
8 internal selectable RX inputs.
2 Direct Audio Inputs.

AMS42F Same as AMS42 with faceplate labeling change from COM2

to AUX1 to match OAS/USFS requirements.

AMS42T AMS42 in tray mount configuration.

AMS42FT Combines ‘F’ and ‘T’ models.

AMS44 5 front panel selectable transceivers.
5 front panel selectable navaids.
2 internal selectable RX inputs.
2 Direct Audio Inputs.

AMS44T AMS44 in tray mount configuration.

End of Section 1.0

Page 1-4 Nov 21, 2003

ENG-FORM: 800-0103.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

AMS42/44 Dual Channel Audio Controller Manual SM19 Rev 4.00

Section 2.0 Installation

2.1 General

Installation information in this section consists of unpacking and inspection procedures,
installation procedures, post-installation checks and installation drawings. Check all
notes and cautions before installation.

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 complete unit should have the following:

- Warranty Card.

- Certificate of Conformity.

- AMS42 or AMS44 Dual Channel Audio Controller

- Operator’s Manual

Verify that all items are present before proceeding and report any shortage

immediately to your supplier.

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 subsequently
activated on the date of shipment from NAT.

2.3 Continued Airworthiness

Maintenance of the AMS42 or AMS44 Dual Channel Audio Controller is ‘on condition’
only. Periodic maintenance of this product is not required.

2.4 Installation Procedures

2.4.1 Warnings ÍIMPORTANT!

Do not bundle any lines from this unit with transmitter coax lines. Do not bundle
any lines from this unit with 400 Hz synchro wiring, or AC power lines. Failure to

observe these limitations may result in incorrect or intermittent operation, or severe
audio interference on received and transmitted signals.

2.4.2 Cautions

In all installations, use shielded cable exactly as shown and ground as indicated.
Significant problems may result from not following these guidelines.

Nov 21, 2003 Page 2-1

ENG-FORM: 805-0102.DOT Amendment #2 Feb 15, 2005

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM19 Rev 4.00 AMS42/44 Dual Channel Audio Controller Manual

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.

Failure to follow the installation and wiring instructions provided in this manual for power
and ground connections, including the rating of the circuit breaker, may lead to damage
in the power input circuitry of the unit.

2.4.3 Cable and Wiring

All unshielded wire shall be selected in accordance with AC43.13-1B Change 1,
Paragraphs 11-76 through 11-78. Wire types should be to MIL-W-22759 as specified in
AC43.13-1B Change 1, Paragraphs 11-85, 11-86, and listed in Table 11-11. 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" from the end of the wire to the shield termination to allow the connector 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 24 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 Amp) or fuse (1 Amp fast blow), and not attached to any other
existing breaker without additional protection.

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 re­adjustment, if needed later. Make sure that the connector locks are tightened, and the
unit is securely fastened to the panel before any flight is attempted.

2.5 Adjustments and Connections

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. The internal adjustments are located on the
top and sides of the unit, and are as follows:

Page 2-2 Nov 21, 2003

ENG-FORM: 805-0102.DOT Amendment #2 Feb 15, 2005

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

AMS42/44 Dual Channel Audio Controller Manual SM19 Rev 4.00

2.5.1 Top panel adjustments

2.5.1.1 Receive Selection Switches

AMS42: The receive selection switches for the navaids are two banks of rocker

switches accessible through the top cover. The right side of the controller
responds to the switches labeled RIGHT USER RX and the left side
responds to the switches labeled LEFT USER RX. Each switch can be
individually selected or deselected by toggling the position of the switch.
To select ‘on’ press the switch downwards at the end nearest the front of
the unit (numbered 1 - 8), and to select ‘off’ press downwards at the end
nearest the back of the unit (marked OPEN.) When viewed from the front
of the unit, the switches toggle the navaids on or off from left to right as
follows:

O P E N

Switch

Function

TAPE

Right

TAPE

Left

AUX2 AUX1 ADF2

ADF1

NAV2

NAV1

.

Switch # 8 7 6 5 4 3 2 1

Note: These inputs are normally selected OFF (OPEN) when the unit is

shipped from the factory.

AMS44: The receive selection switches are two pairs of rocker switches accessible

through the top cover. The right side of the controller responds to the
switches labeled RIGHT USER RX and the left side responds to the
switches labeled LEFT USER RX. TAPE R/L position is selected on or off
by these switches. Each switch can be individually selected or deselected
by toggling the position of the switch between on (pressed downwards at
the end nearest the front of the unit) and off (pressed downwards at the
end nearest the back of the unit.)

LEFT USER RIGHT USER
RX RX

TAPE Right TAPE Left TAPE Right TAPE Left

Nov 21, 2003 Page 2-3

ENG-FORM: 805-0102.DOT

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