Northern Airborne Technology AA37 User Manual
SM39
AA37 Series
Alerting System
INSTALLATION AND OPERATION MANUAL
REV 4.00 November 10, 2003
Northern Airborne Technology Ltd.
1925 Kirschner Road
Kelowna BC, Canada
V1Y 4N7
Telephone (250) 763-2232
Facsimile (250) 762-3374
Copyright 2003 by Northern Airborne Technology
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM39 Rev. 4.00 AA37 Series Alerting System 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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Nov 10, 2003 Page ii
ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM39 Rev. 4.00 AA37 Series Alerting System Manual
Table of Contents
Section Title Page
1.0 Description
1.1 Introduction 1-1
1.2 Purpose of Equipment 1-1
1.3 Features 1-1
1.4 Specifications 1-1
1.4.1 Electrical Specifications 1-1
1.4.2 Physical Specifications 1-2
1.4.3 Environmental Specifications 1-3
1.5 Unit Nomenclature 1-3
2.0 Installation
2.1 Introduction 2-1
2.2 Unpacking and Inspection 2-1
2.3 Installation Procedures 2-1
2.3.1 Warnings 2-1
2.3.2 Cautions 2-1
2.3.3 Cabling and Wiring 2-2
2.3.4 Post-Installation Checks 2-2
2.4 Installation Drawings 2-4
3.0 Operation
3.1 Introduction 3-1
3.2 General 3-1
3.3 Configuration 3-1
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ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM39 Rev. 4.00 AA37 Series Alerting System Manual
Section 1.0 Description
1.1 Introduction
This manual contains information on the AA37 series Alerting Systems.
Information in this section consists of purpose of equipment, features and specifications.
1.2 Purpose of Equipment
The AA37 series are dual channel Alerting Systems that provide two or three level
alerting.
1.3 Features
The AA37 Alerting Systems are compact, remote mounted units. All outputs are fully
isolated to allow installation in dual audio controller systems. Trigger inputs can be
active low or active high dependent on the model, allowing easy interface to common
aircraft systems. The tone and rate of the alerts are adjustable to allow tailoring of the
tones to ensure they do not interfere with existing airframe warning functions.
1.4 Specifications
1.4.1 Electrical Specifications
Input Power 27.5 Vdc at 200 mA (nominal)
Input Signals
Alert 1
AA37-001 2 active low triggers, 30 mA max.
AA37-002 2 active high triggers, 30 mA max.
AA37-212 2 active low triggers, 30 mA max.
Alert 2 (all models) 2 active low triggers, 30 mA max.
Alert 3 (AA37-212 only) 2 active low triggers, 3 mA max.
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ENG-FORM: 800-0103.DOT
AA37 Series Alerting System Manual SM39 Rev. 4.00
Output Signals 2 headset outputs
Output Level into 600 Ω
100% 30 mW
50% 15 mW
33% 10 mW
Output Level into 150 Ω
100% 11 mW
50% 6 mW
33% 4 mW
Output Impedance
100% output 900 Ω ±10%
50% output 1.6 kΩ ±10%
33% output 2.1 kΩ ±10%
Tone Frequency
Alert 1 & 2 Adjustable tone from 750 Hz to 2.3 kHz.
Alert 2 Adjustable rate from 1 Hz to 20 Hz.
Alert 3 (AA37-212 only) Adjustable tone and rate as above with
duration of 1 to 3 seconds.
Audio Noise Level > 60 dB down from rated output.
Crosstalk < -60 dB output to output.
1.4.2 Physical Specifications
Height 31.7 mm (1.25 inches)
Length 111.7 mm (4.4 inches)
Width 114.3 mm (4.5 inches)
Weight
AA37-001 and -002 220 g (0.49 lb)
AA37-212 230 g (0.51 lb)
Mounting Bulkhead mount with four 10-32 screws.
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ENG-FORM: 800-0103.DOT
SM39 Rev. 4.00 AA37 Series Alerting System Manual
Material/Finish Chassis & cover are 5052-H32 brushed
aluminium with chromate conversion
finish.
Connectors 25 pin Male D-subminiature connector
with jack posts
1.4.3 Environmental Specifications
Temperature
Operating -20 C to +55 C
Survival -55 C to +85 C
Altitude 25,000 ft
Humidity 95%
1.5 Unit Nomenclature
Model Description / Distinction
AA37-212 Dual channel, 3 level alerting.
Provides alerting for AA94/AMS42/44.
Floating outputs, 150 - 600 Ω loads.
Low level triggers.
AA37-001 Dual channel, 2 level alerting.
Audible output tones for ICS call or alerting.
Floating outputs, 150 - 600 Ω loads.
Low level triggers.
AA37-002 Dual channel, 2 level alerting.
Audible output tones for ICS call or alerting.
Floating outputs, 150 - 600 Ω loads.
High level triggers for Alert #1.
Low level triggers for Alert #2.
End of section 1.0
Nov 10, 2003 Page 1-3
ENG-FORM: 800-0103.DOT
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