Northern Airborne Technology AA39 User Manual

Installation and Operation Manual

AA39 Series

Headset Adapters

SM43

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 2000

AA39 Series Headset Adapters

SM43 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

1.00 N/A Initial release Aug 25, 2000

4.00 N/A Split Manual Nov 10, 2003

4.01 Section 1 Rev: 1.00

Section

Revision Number

Section 2 Rev: 1.00
Section 3 Rev: 1.00

Revision Description Issue Date

Rewrite in new format Jun 5, 2008

Installation and Operation Manual Page ii

ENG-FORM: 820-0114.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

AA39 Series Headset Adapters

SM43 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 1-1

1.4.1 Electrical Specifications 1-1

1.4.2 Physical Specifications 1-3

1.4.3 Environmental Specifications - AA39-187 and AA39-287 only 1-3

1.5 Unit Nomenclature 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 2-3

2.5 Adjustments and Connections 2-3

2.6 Accessories Required But Not Supplied 2-4

2.6.1 Install Kit for AA39-075 and AA39-087 2-4

2.6.2 Install Kit for AA39-187 and AA39-287 2-4

2.7 Installation Drawings 2-4

3. Operation

3.1 Introduction 3-1

3.2 General Information 3-1

Installation and Operation Manual Page iii

ENG-FORM: 820-0114.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

AA39 Series Headset Adapter

SM43 Installation and Operation Manual

Section 1 Description

1.1 Introduction

Information in this section consists of product description, design features and specifications for the AA39
Series of Dynamic Headset Adapters.

The descriptions given are for the AA39-187, and are identical to those for other models unless otherwise
noted. 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 AA39-187 is a single military headset adapter, consisting of a 5 Ω dynamic military mic to general
aviation 150 Ω amplified dynamic mic adaptor, with an 8 Ω to 600 Ω transformer for phones matching.

The AA39-287 operation is identical to the AA38-187, but is designed for two headsets.
The AA39-087 is used to adapt 5 Ω dynamic military mics (i.e. M-87) to general aviation 150 Ω audi o system s.

The AA39-075 is used to adapt 75 Ω dynamic military mics (i.e. ELNO) to general aviation 150 Ω audio systems.

1.3 Design Features

The AA39-075, AA39-087, AA39-187 and AA39-287 are small, remote mounted metal units with D-sub
connectors. The units are designed to operate from standard mic bi as, supplied by the aircraft radio and
intercom system.

1.4 Specifications

1.4.1 Electrical Specifications

1.4.1.1 AA39-075 and AA39-087

Input Power Not Applicable

Input Signals
Mic Bias: Nominal Bias Voltage: +12 Vdc

Maximum Bias Voltage: +16 Vdc
Minimum Bias Voltage: +9 Vdc

Other: Input current: 10 mA Max. @ Min Bias Voltage
Quantity: 1 Mic channel,
Audio level: AA39-075 850 μVrms for mic input

AA39-087 250 μVrms for mic input

Section 1 Rev: 1.00 Issue 4 Page 1-1

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AA39 Series Headset Adapter

SM43 Installation and Operation Manual

Impedance: AA39-075 75 Ω ± 1 Ω for mic input

AA39-087 5 Ω ± 1 Ω for mic input
Circuitry Type: Balanced
Output Signals

Quantity: 1 mic output
Rated level: 250 mVrms into 150 Ω for mic output
Gain: Min. 1000 or 60 dB for mic amplifier (adjustable)
Circuitry Type: Single ended

1.4.1.2 AA39-187 and AA39-287

Input Power Not Applicable

Input Signals

Mic Bias: Nominal Bias Voltage: +12 Vdc
Maximum Bias Voltage: +16 Vdc
Minimum Bias Voltage: +9 Vdc

Other: Input current: 10 mA Max. @ Min Bias Voltage
Quantity: AA39-187 1 Mic input, 1 phones input

AA39-287 2 Mic inputs, 2 phones inputs
Audio level: 250 μVrms for mic input

7.7 Vrms for phones input
Impedance: 5 Ω ± 1 Ω for mic input

300 Ω ± 10% for phones input
(dependent on load impedance)

Circuitry Type: Balanced input for mic
Balanced transformer input for phones

Output Signals

Quantity: AA39-187 1 mic output, 1 phones output
AA39-287 2 mic outputs, 2 phones outputs

Rated level: 250 mVrms into 150 Ω for mic output

0.8 Vrms into 8 Ω for phones output
Gain: Min. 1000 or 60 dB for mic amplifier

Min. 8.5:1 ratio for phones transformer
Circuitry Type: Single ended output for mic

Balanced transformer output for phones
Freq. Resp. <3 dB from 350 Hz to 6000 Hz. for mic channel

<3 dB from 350 Hz to 6000 Hz. for phones channel
Distortion: <10% THD @ Rated power output

<3% THD @ 10% Continuous output
Audio Noise Level: Without Signal: <-50 dB from rated output
Coupling (AA39-287): Input to Input: ≤-40 dB from rated output

Section 1 Rev: 1.00 Issue 4 Page 1-2

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

AA39 Series Headset Adapter

SM43 Installation and Operation Manual

1.4.2 Physical Specifications

AA39-075 AA39-087 AA39-187 AA39-287
Height
Depth
Width
Weight

1.4.3 Environmental Specifications - AA39-187 and AA39-287 only

1.25” (32 mm) max 1.25” (32 mm) max 1.75” (45 mm) max 1.75” (45 mm) max

2.66” (67 mm) max 2.66” (67 mm) max 2.60” (66 mm) max 2.60” (66 mm) max

4.50” (114 mm) max 4.50” (114 m m ) max 4.50” (114 mm) max 4.50” (114 mm) max

0.25 lbs. (115 g) max 0.25 lbs. (115 g) max 0.44 lbs. (200 g) max 0.61 lbs. (277 g) max

Mounting Four 10-32 screws
Material/Finish Chassis & cover are 5052-H32 brushed aluminum with chromate

conversion finish

Connectors (-075, -087) One male 9-pin D-subminiature connector with screw jacks

(-187, -287) One filtered male 37-pin D-subminiature connector with

Positronics V5 locking tabs

DO-160C Env. Cat. [C4D1]-BA[MN]XXXXXXAXXXBTXXXX
Operating Temperatures -40° C to +70° C
Survival Temperatures -55° C to +85° C
Vibration/Shock DO-160C Cat. M/N
Humidity 95% @ ≥ RH for 48 hrs
Altitude 50,000 ft. Max.
Temperature Variation ± 5° C/min
Operational Shock and Operational: 6 g for 11 ms in all axes

Crash Safety Crash Safety (Impulse) 15 g for 11 ms in all axes
Crash Safety (Sustained) 12 g for 3 s in all axes

1.5 Unit Nomenclature

AA39-075 Military to general aviation mic adaptor

75 Ω Mid-Z mic interface (ELNO)
1 mic input - 850 μVrms into 75 Ω

1 mic output - 250 mVrms into 150 Ω
Powered by mic bias.

AA39-087 Military to general aviation mic adaptor

5 Ω Lo-Z mic interface (M87/M101)
1 mic input - 250 μVrms into 5 Ω

1 mic output - 250 mVrms into 150 Ω
Powered by mic bias.

Section 1 Rev: 1.00 Issue 4 Page 1-3

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

AA39 Series Headset Adapter

SM43 Installation and Operation Manual

AA39-187 Military Lo-Z to general aviation Hi-Z headset adaptor

1 mic input - 250 μVrms into 5 Ω

1 phones output - 0.8 Vrms into 8 Ω
1 mic output - 250 mVrms into 150 Ω

Powered by mic bias.
1 phones input - 7.7 Vrms into 600 Ω

AA39-287 Dual military Lo-Z to general aviation Hi-Z headset adaptor

2 mic inputs - 250 μVrms into 5 Ω

2 phones outputs - 0.8 Vrms into 8 Ω
2 mic outputs - 250 mVrms into 150 Ω

Powered by mic bias.
2 phones inputs - 7.7 Vrms into 600 Ω

Section 1 ends

Section 1 Rev: 1.00 Issue 4 Page 1-4

ENG-FORM: 800-0113.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

AA39 Series Headset Adapter

SM43 Installation and Operation Manual

Section 2 Installation

2.1 Introduction

Information in this section consists of unpacking and inspection procedures, installation procedures, post­installation checks and installation drawings for the AA39 Series Headset Adapter.

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

- 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 AA39 Series Headset Adapter 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

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.