Northern Airborne Technology AA21-4xx User Manual
SM34
AA21-400
Cabin PA 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.
SM34 Rev. 4.00 AA21-400 Cabin PA System Manual
Performed at factory
Performed at factory
Performed at factory
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
Number
Amendment
Date
Section(s)
Changed
Date
Entered
Entered By
1 Jan 18\05 2
2 May 24\06 Pg iii, 1
3 Apr 21\09 2
Insert any Amendment Instruction sheets after this page.
Nov 10, 2003 Page ii
ENG-FORM: 820-0109.DOT Amendment #2 May 24, 2006
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
INSTALL_OPS
MANUAL AMENDMENT
Manual: SM34 (AA21-400) Amendment #: 3
Document # SM34\Install_Ops\809-0003 Amendment Date: Apr 21, 2009
The purpose of this amendment is to add the latest drawings to the manual.
Amendment Instructions:
1
2-5 Rev 4.00 Amendment 1 2-5 Rev 4.00 Amendment #3
2
AA21\400\403-0 Rev 1.00 AA21\400\403-0 Rev 1.01
AA21\400\905-0 Rev 1.00 AA21\400\905-0 Rev 1.10
3 Update the Amendment Record sheet at the front of the manual.
4 Insert this page into the manual after the Amendment Record sheet (page ii).
Manual Amendment ends after the following amended pages
Remove Pages Replace With Pages
Remove Drawings (Section 2) Replace or add Drawings (Section 2)
Amendment #3 Apr 21, 2009 Page 1
ENG-FORM: 809-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
INSTALL_OPS
MANUAL AMENDMENT
Manual: SM34 (AA21-400) Amendment #: 2
Document # SM34\Install_Ops\809-0002 Amendment Date: May 24, 2006
The purpose of this amendment is to correct the numbering sequence and add section
1.5 Accessories Required But Not Supplied to the table of contents.
Amendment Instructions:
1
Title Section Page iii Rev 4.00 Title Section Page iii Rev 4.00 Amendment #2
1-3 and 1-4 Rev 4.00 1-3 and 1-4 Rev 4.00 Amendment #2
2 Update the Amendment Record sheet at the front of the manual.
3 Insert this page into the manual after the Amendment Record sheet (page ii).
Manual Amendment ends after the following amended pages
Remove Pages Replace With Pages
Amendment #2 May 24, 2006 Page 1
ENG-FORM: 809-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
INSTALL_OPS
MANUAL AMENDMENT
Manual: SM34 (AA21-400) Amendment #: 1
Document # SM34\Install_Ops\809-0001 Amendment Date: Jan 18, 2005
The purpose of this amendment is to add the Environmental Qualification Form (521-0)
to section 2.5 and to update the section 2.3.4 Cable Wiring statement paragraph 1.
Amendment Instructions:
1
2-1, 2-2 and 2-5 Rev 4.00 2-1, 2-2 and 2-5 Rev 4.00 Amendment #1
2
- AA21\400\521-0 Rev 1.20
Remove Drawings/Documents (Section 2) Replace or add Drawings/Documents (Section 2)
Note: Ensure that all drawings are inserted in the order shown on the latest drawing lists.
3 Update the Amendment Record sheet at the front of the manual.
4 Insert this page into the manual after the Amendment Record sheet (page ii).
Manual Amendment ends after the following amended pages
Remove Pages Replace With Pages
Amendment #1 Jan 18, 2005 Page 1
ENG-FORM: 809-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM34 Rev. 4.00 AA21-400 Cabin PA 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 1-2
1.4.1 Electrical Specifications 1-2
1.4.2 Physical Specifications 1-4
1.4.3 Environmental Specifications 1-4
1.5 Accessories Required But Not Supplied 1-5
2.0 Installation
2.1 Introduction 2-1
2.2 Unpacking and Inspection 2-1
2.3 Installation Procedures 2-1
2.3.1 Note to Installers 2-1
2.3.2 Warnings 2-1
2.3.3 Cautions 2-2
2.3.4 Cabling and Wiring 2-2
2.3.5 Post-Installation Checks 2-2
2.3.6 Adjustments 2-4
2.4 Continued Airworthiness 2-5
2.5 Installation Drawings 2-5
3.0 Operation
3.1 Introduction 3-1
3.2 Operation Specifics 3-1
3.3 Techniques of Voice Transmission 3-1
3.4 Basic operation 3-1
3.4.1 Power Up 3-1
3.4.2 Input Function Selection 3-2
3.4.3 Volume Control 3-2
3.4.4 Mode switches 3-3
3.4.5 Remote Power Switch 3-3
Nov 10, 2003 Page iii
ENG-FORM: 820-0109.DOT Amendment #2 May 24, 2006
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM34 Rev. 4.00 AA21-400 Cabin PA System Manual
Section 1.0 Description
1.1 Introduction
This manual contains information on the AA21-400 Cabin PA System.
Information in this section consists of purpose of equipment, features and specifications.
1.2 Purpose of Equipment
The AA21-400 Cabin PA control unit is designed to provide centralized control for an
aircraft’s internal and external PA systems. The design is contained in one panelmounted unit, with an illuminated faceplate. All audio and keylines are interfaced to
existing aircraft audio systems. Front panel switches provide selection of the various
operational modes of the AA21 and a potentiometer provides output volume control.
1.3 Features
The AA21-400 provides selection and control of internal and/or external PA system(s)
installed in an aircraft. The integrated 25 W speaker driver circuit is designed to drive
one 8 Ω speaker arrangement for internal paging. The AA21-400 also provides a lowlevel audio signal output that drives the input on a remote mounted power amplifier. The
output is designed to drive the NAT PA110/220 or PA250/700 series amplifiers. The
AA21-400 provides generation of wail and yelp siren audio on the low level output when
selected on the front panel.
A ‘+3 dB’ function allows the output level of the system to be varied by 3 dB. When the
input control line is grounded, the output is reduced by approximately 3 dB, and
removing the ground returns the system to full output.
Thermal protection is designed into the intermediate and final stage amplifiers to protect
the unit during very hot or extended high power operating conditions.
Four front panel switches provide selection of the various operational modes of the
AA21-400 as described in Section 3 of this manual (Operation).
Nov 10, 2003 Page 1-1
ENG-FORM: 800-0106.DOT Amendment #2 May 24, 2006
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
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