Northern Airborne Technology AA20 User Manual

Installation and Operation Manual

AA20 Series

PA/Siren System

SM33-1

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 2008

AA20 Series PA/Siren System

SM33-1 Installation and Operation Manual

IMPORTANT INFORMATION

This manual has been produced to provide information unique to the AA20 Series

PA/Siren System. Some of this information has been published previously in the SM02

Service manual (AA20/22/23, PA110/220 Series Loudhailer/PA Systems).

The information presented in this manual is for reference purposes only and is intended

to provide general information that can be used by the installer/technician to gain a

fundamental understanding of the product. It is not intended to cover all variations of the

AA20 Series audio controllers. Drawing packages for specific AA20 units can be

requested from NAT by contacting the Product Support Department.

Installation and Operation Manual Page ii

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AA20 Series PA/Siren System

SM33-1 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. Jun 26, 2008
Section 2 Rev: 1.00
Section 3 Rev: 1.00

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AA20 Series PA/Siren System

SM33-1 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 1-2

1.4.3 Environmental Specifications 1-2

1.5 Unit Nomenclature 1-2

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 2-4

2.6 Accessories Required But Not Supplied 2-4

2.7 Installation Drawings 2-4

3. Operation

3.1 Introduction 3-1

3.2 General Information 3-1

3.3 Controls and Indicators 3-1

3.3.1 Power Up 3-1

3.3.2 Function Switch 3-1

3.3.3 Volume Control 3-3

3.3.4 External Siren 3-3

3.3.5 Remote Power Switch 3-3

Installation and Operation Manual Page iv

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AA20 Series PA/Siren System

SM33-1 Installation and Operation Manual

Section 1 Description

1.1 Introduction

Information in this section consists of product description, design features and specifications for the AA20
Series PA/Siren System. 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 AA20 PA/Siren systems are compact, self-contained systems capable of 30 W of output p owe r.
They provide a centralized control for audio paging both inside and outside the aircraft.

The AA20 PA/Siren systems are usually used for sling load control and local external paging in smaller
airframes, or internal paging in larger airframes.

1.3 Design Features

The main functions of the AA20 include selection of audio sources for the paging audio and siren for
alerting. Microphone interfacing is accomplished from either an AA9X/AMS4X series audio controller, or a
‘carbon equivalent’ microphone. An external radio feed is provided. The internal siren is adjustable for
tone, rate and level. Provision is made for external power switching to allow PA110/220 power amplifiers
to be connected for increased power output.

All external interconnects and switches are gold plated for maximum reliability. All switches are sealed.
G10-FR flame-retardant circuit boards are post coated for maximum moisture resistance and corrosion
prevention.

1.4 Specifications

1.4.1 Electrical Specifications

Power +22 to 32 Vdc (28 Vdc nominal) at 2.2 A max. (excluding lamps),

0.25 A idle current
Lamps 2 lamps for 28 Vdc operation @ 80 mA max load
Input 2.5 Vrms at 600 Ω (Radio and PA). Impedance 1 kΩ
Output 30 Wrms max. @ 1 kHz into 8 Ω
Microphone Industry standard ‘carbon equivalent’ amplified dynamic

microphone preferred.
Min. 200 mV output required into 150 Ω
David Clark M1/DC, or M4 recommended

Section 1 Rev: 1.00 Issue 4 Page 1-1

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AA20 Series PA/Siren System

SM33-1 Installation and Operation Manual

Power Key External switched +28 Vdc @ 250 mA max. available to activate

remote PA110/220 amplifiers
Key Logic Ground-seeking inputs for all lines

1.4.2 Physical Specifications

Height 1.12" (28.4 m m) max.
Depth 6.56" (166.6 mm) max. (behind panel)
Width 5.76" (146.3 mm) max. (front panel)

5.01" (127.3 mm) max. (rear enclosure)
Weight 1.1 lbs (0.5 kg) (excluding mating connector)
Mounting Standard Dzus Mounting (four fasteners)

1.4.3 Environmental Specifications

Temperature -20 to +55°C (ambient)
Altitude 35,000 feet max.
Humidity 95% Non-condensing
Shock 12g (any axis)

1.5 Unit Nomenclature

AA20-030 Standard swe pt siren, adjustable rate/tone
Mode select, PA/Radio monitor
30 W output into 8 Ω
PA and Siren override at all times
Radio Monitor function
+28 Vdc switched power output
Use with PA110 and PA220 series amplifiers

AA20-050/050H Standard swept siren, adjustable rate/tone
Mode select: Internal/External PA
30 W output into 8 Ω
PA and Siren override at all times
Radio Monitor function
Use with PA110 and PA220 series amplifiers
Adjustable internal level (-050 = 4 W, -050H = 25 W max.)

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AA20 Series PA/Siren System

SM33-1 Installation and Operation Manual

AA20-430 3 tone chime, adjustable rate/tone
Mode select: PA/Tape
25 W output into 8 Ω
PA override at all times
Seatbelt chime interlock
Sidetone output, chime with PA key

Section 1 ends

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AA20 Series PA/Siren System

SM33-1 Installation and Operation Manual

Section 2 Installation

2.1 Introduction

Information in this section consists of unpacking and inspection procedures, installation procedure s, po st­installation checks and installation drawings for the AA20 Series PA/Siren System.

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

- Operators Manual

- 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 AA20 Series PA/Siren System is ‘on condition’ only. Periodic maintenance of this
product is not required.

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AA20 Series PA/Siren System

SM33-1 Installation and Operation Manual

2.4 Installation Procedures

2.4.1 Warnings

The AA20 is a high power device, capable of producing tones at very

high volume levels. Ensure that all personnel are well clear of the

aircraft prior to keying the siren or PA. Failure to adhere to this warning

could cause injury to personnel and/or damage to equipment.

2.4.2 Cautions

Use shielded cable exactly as shown and ground as indicated. All audio
installations can be severely degraded by incorrect wiring and shiel ding.

Unusual buzzes, hums or other background audio are symptomatic of multiple

grounds, or noisy external systems such as blowers or pumps sharing wiring

with the audio system. Never operate any of these units below their

WARNING:

CAUTION:

8 Ω rated impedance.

2.4.3 Cabling and Wiring

All wire shall be selected in accordance with the original aircraft manufacturer's Maintenance Instructions
or AC43.13-1B Change 1, Paragraphs 11-76 through 11-78. Unshielded wire types shall qualify to
MIL-W-22759 as specified in AC43.13-1B Change 1, Paragraphs 11-85, 11-86, and listed in Table 11-11.
For shielded wire applications, use Tefzel MIL-C-27500 shielded wire with solde r sleeve s (fo r shield
terminations) to make the most compact and easily terminated interconnect. Follow the connector map in
Section 2.7 as required.

Allow 3" from the end of the shielded wiring to the shield termination to allow the connector hood to be
easily installed. Reference the interconnect drawing in Section 2.7 for shield termination details. Note that
the hood is a "clamshell" hood, and is installed after the wiring is complete. Aircraft harnessing shall
permit the unit to be lowered from the panel for easy access to all side adjustments. Do NOT mount the
unit until all adjustments have been performed.

Maintain wire segregation and route wiring in accordance with the original aircraft manufacturers
Maintenance Instructions.

Unless otherwise noted, all wiring shall be a minimum of 22 AWG, except power and ground lines, which
shall be a minimum of 20 AWG. Reference the Interconnect drawing for additional specifications. Check
that the ground connection is clean and well secured, and that it shares no path with any electrically noisy
aircraft accessories such as blowers, turn and bank instruments or similar loads. Power to this unit must
be supplied from a separate circuit breaker or fuse (fast blow), and not attached to any other circuit
breaker without additional protection. Verify that the selected circuit breaker size and wire ga uge are
adequate for the installation using the techniques specified in AC43.13-1B Change 1, Paragraphs 11-47
through 11-51 and 11-66 through 11-69.

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