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 [phone]

Facsimile [phone]

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.

AMENDMENT RECORD

Amendment

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Amendment

Date

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Insert any Amendment Instruction sheets after this page.

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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

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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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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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

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SM39 Rev. 4.00 AA37 Series Alerting System Manual

Section 2.0 Installation

2.1 Introduction

Information in this section consists of: unpacking and inspection procedures, installation
procedures, post-installation checks, and installation drawings.

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. Note that each unit should have the following:

- AA37 Dual Channel Alerting System

- Warranty Card

- Release Certification

Verify that all items are present before proceeding and report any shortage immediately
to your supplier.

Complete the warranty card information and send it to NAT when the installation is
complete. If you fail to complete the warranty card, the warranty will be activated on
date of shipment from NAT.

2.3 Installation Procedures

2.3.1 Warnings

Do not bundle any lines from this unit with transmitter coax lines, or AM audio
rectification may result. Do not bundle any input or output audio, or DC power lines
from this unit with 400 Hz synchro wiring or AC power lines. Do not position this unit or
wiring from this unit next to any device with a strong alternating magnetic field such as
an inverter, or significant audio interference will result.

2.3.2 Cautions

In all installations, use shielded cable exactly as shown and ground as indicated.
Significant problems may result from not following these guidelines, especially with
regard to ground loop noise.

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AA37 Series Alerting System Manual SM39 Rev 4.00

2.3.3 Cabling and Wiring

For shielded wire applications, use Tefzel Mil-M-27500 or Mil-M-81044 shielded wire
with solder sleeves (for shield terminations) to make the most compact and easy to
terminate interconnect. Follow the wiring diagrams in Section 2.4 as required.

Allow 3 inches from the end of the wire to the shield termination to allow the hood to be
easily installed. Note that the hood is a “clamshell” hood, and is installed after the
wiring is complete.

All wiring should be at least 22 AWG. Ensure that all ground connections are clean and
well secured.

2.3.4 Post-Installation Checks

2.3.4.1 Voltage/resistance checks

Do not attach the AA37 until the following conditions are met.

Check the following:

a) P101 pin <1> for +28 Vdc relative to ground.

b) P101 pin <14> for continuity to ground (below 0.5 Ω).

2.3.4.2. Alert 1

a) Install the AA37. Power up the ship’s systems. Connect a headset to the pilot’s

headset jack and activate the AA37 Alert 1 trigger circuit. There should be a
continuous tone with no unusual noises or disruptions heard in the headset.
Reset the AA37 Alert 1 trigger circuit.

b) Activate the second AA37 Alert 1 trigger circuit, if installed. There should be a

continuous tone with no unusual noises or disruptions heard in the headset.
Reset the AA37 Alert 1 trigger circuit.

c) Repeat steps 2.3.4.2 a) and b) for the copilot’s headset, if the feature is used in

the installation.

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SM39 Rev. 4.00 AA37 Series Alerting System Manual

2.3.4.5 Alert 2

a) Activate the AA37 Alert 2 trigger circuit. There should be an intermittent (hi/lo)

tone with no unusual noises or disruptions heard in the headset. Reset the AA37
Alert 2 trigger circuit.

b) Activate the second AA37 Alert 2 trigger circuit, if installed. There should be an

intermittent (hi/lo) tone with no unusual noises or disruptions heard in the
headset. Reset the AA37 Alert 2 trigger circuit.

c) Repeat steps 2.3.4.5 a) and b) for the copilot’s headset, if the feature is used in

the installation.

2.3.4.6 Alert 3 (AA37-212 only)

a) Activate the AA37 Alert 3 trigger circuit. There should be a swept tone of 1 to 3

seconds duration, with no unusual noises or disruptions heard in the headset.
Reset the AA37 Alert 3 trigger circuit.

b) Activate the second AA37 Alert 3 trigger circuit, if installed. There should be a

swept tone of 1 to 3 seconds duration, with no unusual noises or disruptions
heard in the headset. Reset the AA37 Alert 3 trigger circuit.

c) Repeat steps 2.3.4.6 a) and b) for the copilot’s headset, if the feature is used in

the installation.

2.4 Installation Drawings

DRAWING REV. DESCRIPTION TYPE

AA37\212\403-0 1.02 Alerting System Interconnect

AA37\212\405-0 1.01 Alerting System Connector Map

AA37\212\922-0 1.00 Alerting System Mechanical

AA37\001\403-0 1.01 Alerting System Interconnect

AA37\001\405-0 1.00 Alerting System Connector Map

AA37\001\922-0 1.00 Alerting System Mechanical

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AA37 Series Alerting System Manual SM39 Rev 4.00

AA37\002\403-0 1.01 Alerting System Interconnect

AA37\002\405-0 1.00 Alerting System Connector Map

Section 2.0 ends after these drawings

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Confidential and Proprietary to NAT

Confidential and Proprietary to NAT

Confidential and Proprietary to NAT

Confidential and Proprietary to NAT

Confidential and Proprietary to NAT

Confidential and Proprietary to NAT

Confidential and Proprietary to NAT

Confidential and Proprietary to NAT

SM39 Rev. 4.00 AA37 Series Alerting System Manual

Section 3.0 Operation

3.1 Introduction

Information in this section consists of the functional and operational procedures for the
AA37 series Alerting Systems.

3.2 General

The AA37 series are dual channel Alerting Systems that provide two or three level
alerting.

3.3 Configuration

The AA37 has no normal user operational aspects. During installation, or if the unit
has been exchanged, it may be a requirement to change internal adjustments. This
should be done ONLY BY FULLY QUALIFIED PERSONNEL.

End of section 3.0

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.