AMS43 TSO
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Installation and Operation Manual
AMS43 TSO
Single Channel Audio Controller
SM27
ISSUE 4.01
Northern Airborne Technology Ltd.
1925 Kirschner Road
Kelowna, BC, Canada.
Telephone (250) 763-2232
Facsimile (250) 762-3374
Issued on the authority of Northern Airborne Technology Ltd.
Copyright 2000
V1Y 4N7
AMS43 TSO Single Channel Audio Controller
SM27 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
1.4.4 Product Approval 1-4
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 2-2
2.4.2 Cautions 2-2
2.4.3 Cabling and Wiring 2-2
2.4.4 Post-Installation Checks 2-3
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
2.6 Accessories Required But Not Supplied 2-5
2.7 Installation Drawings 2-5
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 iii
ENG-FORM: 820-0115.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
AMS43 TSO Single Channel Audio Controller
SM27 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 TSO Single Channel Audio Controller. Any derivatives of this product will be identified as
AA95-xxx TSO. All derivative product information will be contained in the applicable manual supplement,
which may be obtained from Northern Airborne Technology Ltd. as required.
Review all notes, warnings and cautions.
1.2 Product Description
The AMS43 TSO provides control for all aircraft audio, allowing selection of transmit and receive audio,
LIVE, KEYED, or VOX intercom, interface for an additional hand-held transmit microphone (hand mic),
and pilot isolation/emergency operation.
Transmit and PA functions are controlled with a single rotary switch. Receive audio, ICS operations and
tape audio are controlled with toggle switches. Receive 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 TSO is a Dzus rail mounted unit with lighted faceplate. Transceiver interfacing is
accomplished through directly switched microphones. To ensure maximum radio compatibility, it has a
ground referenced keyline that does not incorporate diodes or other steering components.
Independent control is provided for each audio channel within the controller, allowing sidetone, ICS audio,
and RX audio to be independently set.
Boom mic support is provided for the pilot and co-pilot, with both ICS and XMIT functions via cyclic or
yoke switching. Live (Hot Mic) and VOX ICS are also provided, designed to allow immediate transmission
via this mode without further control panel switching, and immediate return to ICS operation on
completion. The ICS (intercom) 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 transmit
for clarity. ICS operation allows transmit during any ICS mode by using the transmit PTT switch.
All external interconnects, 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 sho ck), dry n itrogen
filled units.
Section 1 Rev: 1.00 Issue 4 Page 1-1
ENG-FORM: 800-0116.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
AMS43 TSO Single Channel Audio Controller
SM27 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
100 Ω ±10% for mic inputs
1.6 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 <-60 dB
Keylines 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 mW (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 20 Ω max
Circuitry Type Balanced output for high common mode noise rejection
Section 1 Rev: 1.00 Issue 4 Page 1-2
ENG-FORM: 800-0116.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
AMS43 TSO Single Channel Audio Controller
SM27 Installation and Operation Manual
Frequency Response:
Sidetone <3 dB from 350 Hz to 6000 Hz
Receive inputs <3 dB from 350 Hz to 6000 Hz
Intercom <3 dB from 350 Hz to 3000 Hz
Alert 1 1.5 kHz ±20%
Alert 2 Same as Alert 1 but swept @ 2 cycles/sec
Alert 3 Approximately the same as Alert 2 but on for 2 sec
Distortion <10% THD @ rated power output
Audio Noise Level >60 dB down from rated output (without signal)
Coupling <-55 dB
Output Regulation at 400% and <10% distortion / Δ3 dB max of rated output power
75% of rated load.
Annunciators Green LE D w i ll li g h t fo r tr a n sm i t op e r at i o n
1.4.2 Physical Specifications
Height 1.88" (47.6 mm)
Depth 6.83" (173.4 mm)
Width (behind panel) 4.99" (126.7 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 with slide locks
chromate conversion finish
1.4.3 Environmental Specifications
Operating Temperatures -20°C to +55°C
Survival Temperatures -55°C to +85°C
Altitude 25,000 ft. Max
Humidity 95%
Shock 6g (any axis)
Vibration RTCA/DO-160C Categories P and S
Qualification of the AMS43TSO Single Channel Audio Controller was completed in accordance
with DO-160A Env. Cat. A1B1/A/PS/XXXXXXABABA
Note: Refer to Environmental Qualification Form located in Section 2 of this Manual for complete details
of the environmental categories.
Section 1 Rev: 1.00 Issue 4 Page 1-3
ENG-FORM: 800-0116.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
AMS43 TSO Single Channel Audio Controller
SM27 Installation and Operation Manual
1.4.4 Product Approval
FAA: TSO-C50c (RTCA/DO-170 Class
Ia, RTCA/DO-160 A & C)
Section 1 ends
Section 1 Rev: 1.00 Issue 4 Page 1-4
ENG-FORM: 800-0116.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
AMS43 TSO Single Channel Audio Controller
SM27 Installation and Operation 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 for the AMS43 TSO 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 Northern Airborne Technology Ltd. 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 Northern Airborne Technology Ltd. or its designated warranty repair center, or
any labour to remove or re-install the defective unit in the aircraft. Contact Northern Airborne Technology
Ltd. for any questions regarding this warranty, its applicability to your units and/or for return authorization.
Northern Airborne Technology Ltd. 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 NORTHERN AIRBORNE TECHNOLOGY LTD. 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 TSO Single Channel Audio Controller is ‘on condition’ only. Periodic
maintenance of this product is not required.
2.4 Installation Procedures
Installation Notice
This product must be installed in accordance with the installation instructions provided in the latest issue
of this Installation and Operation Manual. Check the Publication Index at www.northernairborne.com for
the issue status of the manual. The latest issue of the manual may be downloaded from the same
website. All risk associated with installation of this product contrary to these instructions shall be the
responsibility of the installing agency.
Section 2 Rev: 1.00 Issue 4 Page 2-1
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
AMS43 TSO Single Channel Audio Controller
2.4.1 Warnings
Set the headset volume control to the minimum setting prior to
conducting tests, and slowly increase the headset volume to a
2.4.2 Cautions
Do not bundle any lines from this unit with transmitter coax feedlines. 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.
In all installations, use shielded cable exactly as shown, and ground only as
indicated. Significant problems may result from not following these guidelines.
SM27 Installation and Operation Manual
WARNING:
High volume settings can cause hearing damage.
comfortable listening level.
CAUTION:
2.4.3 Cabling and Wiring
All wire shall be selected in accordance with the original aircraft manufacturer's Maintenance Instructions
or AC43.13-1B Change 1, Paragraphs 11-76 through 11-78. Unshielded wire types shall qualify 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 solde r sleeve s (fo r shield
terminations) to make the most compact and easily terminated interconnect. Follow the interconnect
drawing in Section 2.7 as required.
Allow 3" from the end of the shielded wiring to the shield termination to allow the connector hood to be
easily installed. Refer to the interconnect drawing in Section 2.7 for shield termination details. Note that
the hood is a "clamshell" hood, and is installed after the wiring is complete. Aircraft harnessing shall
permit the unit to be removed from the panel for easy access to all side adjustments. Do NOT mount the
unit until all adjustments have been performed.
Maintain wire segregation and route wiring in accordance with the original aircraft manufacturers
Maintenance Instructions.
Unless otherwise noted, all wiring shall be a minimum of 22 AWG, except power and ground lines, which
shall be a minimum of 20 AWG. Reference the Interconnect drawing for additional specifications. Check
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 circuit breaker or fuse (fast blow), and not attached to any other circuit
breaker without additional protection. Verify that the selected circuit breaker size and wire gauge are
adequate for the installation using the techniques specified in AC43.13-1B Change 1, Paragraphs 11-47
through 11-51 and 11-66 through 11-69.
Section 2 Rev: 1.00 Issue 4 Page 2-2
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
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