Northern Airborne Technology AA12S User Manual
Installation and Operation Manual
AA12S Series
Compact Audio Controller
SM69
ISSUE 4.01
Northern Airborne Technology Ltd.
1925 Kirschner Road
Kelowna, BC, Canada.
V1Y 4N7
Telephone (250) 763-2232
Facsimile (250) 762-3374
Issued on the authority of Northern Airborne Technology Ltd.
Copyright 2005
AA12S Series Compact Audio Controller
SM69 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
Section
Revision Number
Revision Description Issue Date
4.01 Section 1 Rev: 1.00
Update to current templates. Nov 7, 2008
Section 2 Rev: 1.00
Section 3 Rev: 1.00
Installation and Operation Manual Page ii
ENG-FORM: 820-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
AA12S Series Compact Audio Controller
SM69 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 1-5
1.4.3 Environmental Specifications 1-5
1.5 Unit Nomenclature 1-5
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 2-2
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 Adjustments 2-4
2.5.2 Right Side Adjustments 2-4
2.6 Accessories Required But Not Supplied 2-4
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 Radio Selection 3-1
3.3.2 Intercom 3-2
3.3.3 PILOT ISO / NORM Modes 3-3
3.3.4 Entertainment Audio 3-4
3.3.5 Automatic Fail-safe 3-4
Installation and Operation Manual Page iii
ENG-FORM: 820-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
AA12S Series Compact Audio Controller
SM12S Installation and Operation Manual
Section 1 Description
1.1 Introduction
Information in this section consists of product description, design features and specifications for the
AA12S Series Compact 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 AA12S is a compact Dzus-mounted audio controller with an integral 4-place stereo voice-activated
intercom. It provides intercom capabilities for the pilot, co-pilot and two passengers (PAX). The AA12S
accepts stereo music inputs from either portable or fixed entertainment systems to produce high quality
stereo headset output.
Radio functions include selectable transmit capability for pilot and co-pilot on 3 COM radios and a PA.
Receive audio selections include COM1, COM2, COM3, MKR, NAV, ADF, and DME.
1.3 Design Features
All four mics have individual VOX gating. Each gate may also be activated with the corresponding ICS
keyline.
ICS muting is automatic during radio transmission.
The unit is supplied to suit a standard NAT bi-directional ICS audio TIE line for multi-unit interface
(configuration dependent). The crew and PAX are always connected except in the case of Pilot ISO
mode, when the pilot is disconnected from the ICS tie line.
If required, one or more receiver audio inputs may be configured at the factory prior to ordering as an
unswitched Direct Audio input. A new part number may be assigned. Contact NAT Product Support for
further information.
The following audio levels can be adjusted at the time of installation, or during service by an approved
dealer, using individual level trimpots.
- ICS Balance - Music Mute level
- ICS Bass level - RX Balance
- Music Balance - RX volume level
- Music Bass level - Sidetone level
Section 1 Rev: 1.00 Issue 4 Page 1-1
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
AA12S Series Compact Audio Controller
SM12S Installation and Operation Manual
1.4 Specifications
1.4.1 Electrical Specifications
Power Supply
13.8 Vdc or 27.5 Vdc @ 600 mA (nominal, one input for both)
11.0 Vdc (minimum)
Note: The AA12S is not designed to operate under emergency electrical system conditions for 14 Vdc
Input Signals
Linear regulator with reverse and over-voltage protection.
Input Voltage 11 – 30 Vdc operating range
30.3 Vdc (maximum)
Lighting Voltage
AA12S-001 27.5 Vdc @ 200 mA max.
AA12S-004 13.5 Vdc @ 400 mA max.
operation.
Microphone
Quantity 4 (Pilot, Copilot, 2 Passengers)
Rated Level 250 mVrms nominal (125 to 500 mVrms)
Impedance 150 Ohm ±10%
Circuitry Type Unbalanced
TX Keyline
Quantity 2 (Pilot, Copilot)
Rated Level Ground activates keyline, ±20 mA source current
ICS Keyline
Quantity 4 (Pilot, Copilot, 2 Passengers)
Rated Level Ground activates keyline, <1 mA source current
Receive Audio
Quantity 7 (3 COM, 4 NAV)
Rated level 2.5 Vrms nominal (1.3 to 5.0 Vrms)
Impedance 1 kOhm ±10 % (1 to 3 kOhm for sidetone)
Circuitry type Unbalanced
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
AA12S Series Compact Audio Controller
SM12S Installation and Operation Manual
Music Inputs
Quantity 2 (left channel, right channel)
Rated level 1.4 Vrms nominal (850 mVrms to 2.4 Vrms)
Impedance 11 kOhm ±10 %
Circuitry type Unbalanced
Bi-directional Signals
ICS TIE Channel
Quantity 1
Rated level 340 mVrms nominal (170 to 680 mVrms)
Impedance 2 kOhm ±10 %
Circuitry type Unbalanced
Output Signals
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
Phones
Quantity 4 (Pilot, Copilot, 2 Passengers)
Rated level >5.5 Vrms (>100 mW, RX, ICS and music)
>0.7 Vrms (TX sidetone, adjustable)
1.5 Vrms nominal (Pilot ISO mode)
>0.2 Vrms (Automatic failsafe mode)
Impedance 300 Ohm ±10 %
Circuitry type Transformer, Unbalanced
Mics
Quantity 4 (COM1, COM2, COM3 and PA)
Rated level 250 mVrms ±10 %
Impedance 150 Ohm nominal
Circuitry type Direct throughline via relay
Keylines
Quantity 4 (COM1, COM2, COM3 and PA)
Rated level <1 A
Circuitry type Grounded relay contact
AA12S Series Compact Audio Controller
SM12S Installation and Operation Manual
Audio Performance
As per RTCA DO-170 Product Classification 1a except where noted.
* Manufacturers Specification ** Exceeds DO-170 requirement
Rated Output Power 100 mW min. into 300 Ohm (each stereo channel)
Audio frequency Response
Input
Audio noise -60 dB max**
Output Regulation ≤3 dB variance (350 to 6000 Hz)
Audio Communication Loud & Clear
ICS Volume controls <35 dB range*, 40 dB nominal
Music Volume controls <35 dB range*, 40 dB nominal
Receive Input impedance 1 kOhm ±10 %
Mic Input impedance 150 Ohm ±10 %
Music Input impedance 11 kOhm ±10 %
ICS Tie Line 2 kOhm ±10 %
Receive ≤3dB down from 350 - 6000 Hz
Intercom ≤3dB down from 350 - 3000 Hz
ICS Tie ≤3dB down from 350 - 3000 Hz
Music ≤3dB down from 300 - 15000 Hz
(Music Bass control at mid setting)
Distortion ≤10%, ≤3 % typical (350 to 6000 Hz)
Input crosstalk -37 dB max*
Output crosstalk -55 dB max
Mic crosstalk <200 μVrms*
Section 1 Rev: 1.00 Issue 4 Page 1-4
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
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