Northern Airborne Technology AA83-100 User Manual

SM10

AA31

ICS Mode Controller

INSTALLATION AND OPERATION MANUAL

REV 4.10 February 4, 2005

Northern Airborne Technology Ltd.

1925 Kirschner Road

Kelowna, BC, Canada.

V1Y 4N7

Telephone [phone]

Facsimile [phone]

Copyright 2005 by Northern Airborne Technology

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM10 Rev. 4.10 AA31 ICS Mode 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.

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Feb 4, 2005 Page ii

ENG-FORM: 820-0110.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM10 Rev. 4.10 AA31 ICS Mode Controller Manual

Table of Contents

Section Title Page

1 Description

1.1 Introduction 1-1

1.2 Purpose of Equipment 1-1

1.3 Features 1-1

1.4 Specifications 1-2

1.4.1 Electrical Specifications 1-2

1.4.2 Physical Specifications 1-2

1.4.3 Environmental Specifications 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 Installation Procedures 2-1

2.3.1 Warnings 2-1

2.3.2 Cautions 2-2

2.3.3 Cabling and Wiring 2-2

2.3.4 Notes 2-2

2.3.5 External Switches and Lamps 2-2

2.3.6 Post-Installation Checks 2-3

2.4 Continued Airworthiness 2-3

2.5 Accessories Required But Not Supplied 2-4

2.6 Installation Drawings 2-4

3 Operation

3.1 Introduction 3-1

3.2 General 3-1

3.3 Operation Specifics 3-1

3.3.1 Intercom Function Selector 3-1

3.3.2 Annunciators 3-2

Feb 4, 2005 Page iii

ENG-FORM: 820-0110.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM10 Rev. 4.10 AA31 ICS Mode Controller Manual

Section 1 Description

1.1 Introduction

This manual contains information on the AA31-001 and AA31-002 ICS Mode
Controllers. All derivative products will be covered by manual supplements, which can
be obtained from NAT as required.

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

1.2 Purpose of Equipment

The AA31 ICS Mode Controller provides a convenient, centralized method of organizing
the aircraft audio system into multiple intercom circuits for independent or common
operation. This function is especially valuable for EMS and law enforcement
applications, where several independent operations occur within the aircraft that often
require isolation from each other, while retaining the ability to share common
communication.

The AA31 can provide ICS switching for three or four NAT Audio Controllers, or other
NAT products incorporating an ICS TIE LINE. The AA31 also has provisions for driving
external annunciators and interfacing for ICS Calling.

1.3 Features

Front panel annunciators provide positive indication of the ICS mode selection. The
LED on the right of the ICS Function Knob lights green to indicate ICS Function is ALL
COMMON. The LED on the left of the ICS Function Knob lights amber to indicate that
any of the ICS functions is in the ISO (isolated) position.

The AA31 has four annunciator outputs, one output for each ICS Function. The outputs
on the AA31-002 can drive the Isolated Warning inputs on a NAT Audio Controller. The
outputs on the AA31-001 and AA31-002 can drive external lamps.

The AA31 provides load matching so that the ICS Levels will not change as the ICS
Function is changed. When the AA31 isolates an Audio Controller’s ICS Tie Line, it
connects a resistor, equal to the load of the ICS Tie Line, in place of the isolated Audio
Controller.

The REAR CALL annunciators illuminate when a rear call signal is activated.

ICS Function switching is a passive circuit, so it will continue to operate with no power
to the AA31. The annunciators and outputs will fail without power.

Feb 4, 2005 Page 1-1

ENG-FORM: 800-0108.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

AA31 ICS Mode Controller Manual SM10 Rev. 4.10

1.4 Specifications

1.4.1 Electrical Specifications

Input power: +28 Vdc

Power Requirements:
Nominal 155 mA max @ +27.5 Vdc
Lighting 80 mA max @ +27.5 Vdc

Annunciators:
REAR CALL (left) Amber (dimming)
REAR CALL (right) Amber (dimming)
ISO Amber (dimming)
COMMON Green (dimming)

Input Signals:

Quantity 4 ICS Tie Lines
2 Rear Call Lines

Circuitry Type Tie Lines are single ended

Output Signals:

Quantity 4 ICS Tie Lines,
2 Rear Call Lines,
4 Mode Annunciator Lines
Circuitry Type Tie Lines are single ended.

ICS Function Outputs (4) ALL ISO, REAR ISO, PILOT ISO, ALL COMMON.

AA31-001 Source 100 mA Max
AA31-002 Open Collector Output Sink 100 mA Max

1.4.2 Physical Specifications

Height 1.13" (28.7 mm)

Depth 2.82" (71.61 mm) behind panel

Width 4.90 (124.5 mm) behind panel

5.75" (146.1 mm) in front of panel

Weight 0.50 lbs. (225 g)

Mounting Panel mount Dzus rail (4 fasteners)

Faceplate Engraved acrylic edge lit panel.
Connectors Male 25-pin D-sub with jack screw fasteners

Material/Finish Chassis & cover are 5032-H32 brushed

aluminum with chromate conversion finish

Page 1-2 Feb 4, 2005

ENG-FORM: 800-0108.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM10 Rev. 4.10 AA31 ICS Mode Controller Manual

1.4.3 Environmental Specifications

Temperature: Normal -40° C to +55° C
Survival -55° C to +85° C.

Altitude +25,000 ft. (7,620 m).

Humidity 95 % for 48 hrs.

Shock 6 g for 11 ms.

Qualification
DO-160C Env. Cat. B4-BA[MN]XXXXXXXXXXXXXXXX

1.5 Unit Nomenclature

Other variants are available; please contact NAT for further information.

AA31-001 Mode selector for organizing multiple ICS circuits
Visual LED annunciation of mode status
External annunciation – 100 mA max @ 28 Vdc
Two rear call annunciators with separate circuits
28 Vdc backlighting
Provides voltage for external annunciation

AA31-002 Mode selector for organizing multiple ICS circuits
Visual LED annunciation of mode status
External annunciation – 100 mA max @ 28 Vdc
Two rear call annunciators with separate circuits
28 Vdc backlighting
Provides switched grounds for external annunciation

End of section 1

Feb 4, 2005 Page 1-3

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.