Nat AA20-431 User manual

CONFIDENTIAL AND PROPRIETARY TO WULFSBERG.
SM22
AA20-431
Cabin PA System
INSTALLATION AND OPERATION MANUAL
REV 4.11 February 17, 2011
Wulfsberg Electronics
6400 Wilkinson Drive
Prescott, AZ 86301
Telephone [phone]
Copyright 2004 by Northern Airborne Technology
These commodities, technology or software are controlled in accordance with the United States Export Administration Regulations, Export Classification
Control Number(ECCN) EAR99. When exporting, diversion contrary to U.S. law is prohibited.

SM22 Rev. 4.11 AA20-431 Cabin PA System Manual
February 17, 2011 Page ii
ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO WULFSBERG.
Prepared By: Checked By: Certification: Approved By:
Periodically Wulfsberg 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 Feb 17/09 2
Insert any Amendment Instruction sheets after this page.
Performed at factory
Performed at factory
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INSTALL_OPS
MANUAL AMENDMENT
Manual: SM22 (AA20-431) Amendment #: 1
Document # SM22\Install_Ops\809-0001 Amendment Date: Jan 18, 2005
Amendment #1 Jan 18, 2005 Page 1
ENG-FORM: 809-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
The purpose of this amendment is to add the Environmental Qualification Form (521-0)
to section 2.6 and to update section 2.3.5 Cable and Wiring statement paragraph 1.
Amendment Instructions:
1 Remove Pages Replace With Pages
2-1 thru 2-5 Rev 4.10 2-1 thru 2-5 Rev 4.10 Amendment #1
2 Remove Drawings/Documents (Section 2) Replace or add Drawings/Documents (Section 2)
- AA20\431\521-0 Rev 1.00
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
These commodities, technology or software are controlled in accordance with the United States Export Administration Regulations, Export Classification
Control Number(ECCN) EAR99. When exporting, diversion contrary to U.S. law is prohibited.

INSTALL_OPS
MANUAL AMENDMENT
Manual: SM22 (AA20-431) Amendment #: 2
Document # SM22\Install_Ops\809-0002 Amendment Date: Feb 17, 2009
Amendment #2 Feb 17, 2009 Page 1
ENG-FORM: 809-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
The purpose of this amendment is to add the latest documents and drawings to the
manual.
Amendment Instructions:
1 Remove Pages Replace With Pages
2-1 and 2-2 Rev 4.10 Amendment #1 2-1 and 2-2 Rev 4.10 Amendment #2
2-5 Rev 4.10 Amendment #1 2-5 Rev 4.10 Amendment #2
2 Remove Drawings (Section 2) Replace or add Drawings (Section 2)
AA20\431\905-0 Rev 1.02 AA20\431\905-0 Rev 1.03
– AA20\431\922-0 Rev 1.20
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
These commodities, technology or software are controlled in accordance with the United States Export Administration Regulations, Export Classification
Control Number(ECCN) EAR99. When exporting, diversion contrary to U.S. law is prohibited.

SM22 Rev. 4.10 AA20-431 Cabin PA System Manual
Apr 21, 2004 Page iii
ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
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 1-3
1.4.3 Environmental Specifications 1-4
2.0 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 Note to Installers 2-1
2.3.2 Warnings 2-2
2.3.3 Cautions 2-2
2.3.4 Notes 2-2
2.3.5 Cabling and Wiring 2-2
2.3.6 Fuses and Breakers 2-2
2.3.7 Adjustments 2-3
2.3.8 Post Installation Checks 2-4
2.4 Continued Airworthiness 2-5
2.5 Accessories Required But Not Supplied 2-5
2.6 Installation Drawings 2-5
3.0 Operation
3.1 Introduction 3-1
3.2 General 3-1
3.3 Switches and Indicators 3-1
3.3.1 Power Switch 3-1
3.3.2 Speaker switch 3-1
3.4 Chimes 3-2
3.4.1 No Smoking 3-2
3.4.2 Seatbelt 3-2
3.4.3 Message 3-2
3.4.4 PA 3-2
These commodities, technology or software are controlled in accordance with the United States Export Administration Regulations, Export Classification
Control Number(ECCN) EAR99. When exporting, diversion contrary to U.S. law is prohibited.

SM22 Rev. 4.11 AA20-431 Cabin PA System Manual
February 17, 2011 Page 1-1
ENG-FORM: 800-0107.DOT
CONFIDENTIAL AND PROPRIETARY TO WULFSBERG.
Section 1.0 Description
1.1 Introduction
This manual contains information on the AA20-431 Cabin PA System. All derivatives
will be covered by manual supplements which can be obtained from Wulfsberg as
required.
Information in this section consists of purpose of equipment, features and specifications.
1.2 Purpose of Equipment
The AA20-431 is a passenger announcement and entertainment system, capable of
providing a 30 W/8 speaker output for in flight music, messages and advisory tones.
The system also provides eight 150 headset outputs for use in operational
environments where it is not practical to use the speaker output.
The AA20-431 PA controller provides central adjustment for all the PA and music audio
to the passengers. Automatic chime before announcements and soft music muting are
standard features.
1.3 Features
The AA20-431 accepts music inputs from either portable cassette tape/CD players or
remote CD changers/am/fm cassette players. The left and right music inputs are
summed internally.
Music audio will mute and chime will activate prior to cabin pages; this allows for un-
distracted passenger attention. ‘Seat Belt’ and ‘No Smoking’ sign interlocks energize
the chime circuit when enabled and disabled. The Microphone input has an adjustable
sidetone amplifier, which provides ‘PA sidetone’ to the audio controller.
A +3 dB switch input allows the output level to change to suit aircraft operating
conditions.
The AA20-431 features Thermal and Overload protection circuits. These circuits
provide the internal circuitry with protection from over-voltage, over-current and high
temperature conditions.
These commodities, technology or software are controlled in accordance with the United States Export Administration Regulations, Export Classification
Control Number(ECCN) EAR99. When exporting, diversion contrary to U.S. law is prohibited.

AA20-431 Cabin PA System Manual SM22 Rev. 4.11
Page 1-2 February 17, 2011
ENG-FORM: 800-0107.DOT
CONFIDENTIAL AND PROPRIETARY TO WULFSBERG.
1.4 Specifications
1.4.1 Electrical Specifications
Input Power: 22 to 30 Vdc, 280 mA idle (2 A max.)
Lamp Power: +28 Vdc, 80 mA
Inputs:
Music: Two tape inputs, left & right channel mixed
internally
Tape audio levels: 1.0 Vrms @ 1 kHz (Input impedance 8.6 k)
CD audio levels: 400 mVrms @ 1 kHz (Input impedance 10 k)
(Note: remove internal jumpers for CD input)
Microphones: High impedance 150 amplified dynamic. ALC
starts at 70 mVrms. Impedance is 125 10%.
PA Key: Active low. Current source 15 mA max. (chime
will activate only once)
Seat Belt & Active low. Current source 15 mA max.
No Smoking Key: Trigger Voltage 2 Vdc max. (chime will activate
twice, once on keying and again on un-keying)
Message Key: Active high. Current sink 15 mA max. Trigger
voltage 28 Vdc max. (chime will activate twice,
once on keying and again on un-keying)
+3 dB Key: Active open. Current source 1 mA max.
(headset & speaker audio levels will decrease
by 3 dB when grounded)
Outputs:
Headset: Eight outputs – 80 mW max each into 600 @ 10%
THD
Short circuit protected.
Audio Bandwidth: Mic channel –<3 dB, 350 Hz to 3 kHz
Music channel –<3 dB, 150 Hz to 9 kHz
Signal to noise ratio –65 dB
Sidetone: Adjustable 0 –100 mW into 600 @ 10% THD.
Audio bandwidth: <3 dB, 350 Hz to 3 kHz
These commodities, technology or software are controlled in accordance with the United States Export Administration Regulations, Export Classification
Control Number(ECCN) EAR99. When exporting, diversion contrary to U.S. law is prohibited.

SM22 Rev. 4.11 AA20-431 Cabin PA System Manual
February 17, 2011 Page 1-3
ENG-FORM: 800-0107.DOT
CONFIDENTIAL AND PROPRIETARY TO WULFSBERG.
Signal to noise ratio –65 dB
Speaker: 25 W into 8 @ <10% THD
20 W into 8 continuous power with single tone
35 W max @ 26.6% THD into 8 ohms with 1 Vrms
into music input and music and speaker trim pots
fully clockwise.
28 Watts max. @ 10% THD into 8 with 1 Vrms
into the music input.
Impedance and short circuit protected
Audio Bandwidth: Mic channel – <3 dB, 350 Hz to 3 kHz
Music channel – <3 dB, 150 Hz to 9 kHz
Signal-to-noise ratio – 65 dB
Chime: Fixed rate, adjustable level
Miscellaneous:
Temperature Sensor: The unit contains a temperature sensor IC
which when triggered reduces the input signals
by 3 dB
The IC threshold is set to approximately 129C
1.4.2 Physical Specifications
Height: 1.12 (28.45 mm)
Depth: 7.25 (184.15 mm) max.
6.52 (165.61 mm) behind faceplate
Width: 5.75 (146.05 mm) max.
5.00 (127.00 mm) behind faceplate
Weight: 1.3 lbs (610 g)
Mounting: Unit fits standard Dzus rails
Note: requires rails for maximum heat
dissipation
Finish/Material: Chassis & cover are 5052-H32 brushed
aluminum with chromate conversion. Heat
sinks are 6063-T6 aluminum with chromate
conversion
Connectors: Male filtered 37 pin D-subminiature with
Positronics V5 locking tabs.
These commodities, technology or software are controlled in accordance with the United States Export Administration Regulations, Export Classification
Control Number(ECCN) EAR99. When exporting, diversion contrary to U.S. law is prohibited.

AA20-431 Cabin PA System Manual SM22 Rev. 4.11
Page 1-4 February 17, 2011
ENG-FORM: 800-0107.DOT
CONFIDENTIAL AND PROPRIETARY TO WULFSBERG.
1.4.3 Environmental Specifications
Operating Temperature: -30C to +55C
Survival Temperature: -55C to +85C
Altitude: 35,000 ft
Humidity: >95% at +50C
Vibration/Shock: DO-160C, Cat. M, N
TSO Compliance: TSO-C50c, RTCA DO-170 Class II
(Applicable to units s/n 2000 and above)
DO-160C Env. Cat. : C4-BA[MN]XXXXXXABABBTBXXX
1.5 Unit Nomenclature
Model Description
AA20-431 3-tone chime, Seat Belt & No Smoking chime interlock
30 W into 8 .
PA over-ride with sidetone.
End of section 1.0
These commodities, technology or software are controlled in accordance with the United States Export Administration Regulations, Export Classification
Control Number(ECCN) EAR99. When exporting, diversion contrary to U.S. law is prohibited.

SM22 Rev. 4.11 AA20-431 Cabin PA System Manual
February 17, 2011 Page 2-1
ENG-FORM: 805-0106.DOT Amendment #2
CONFIDENTIAL AND PROPRIETARY TO WULFSBERG.
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:
- AA20-431 Cabin PA System
- Warranty Card
- Operator’s Manual
- Release certification
Verify that all items are present before proceeding and report any shortage immediately
to your supplier.
2.2.1 Warranty
Complete the warranty card information and send it to Wulfsberg when the installation is
complete. If you fail to complete the warranty card, the warranty will be activated on
date of shipment from Wulfsber.
Note: An appropriately rated facility, e.g. Certified Aircraft Repair Station, must install this
equipment in accordance with applicable regulations. Wulfsberg warranty is not
valid unless the equipment is installed by an authorized Wulfsberg Dealer. Failure
to follow any of the installation instructions, or installation by a non-certified
individual or agency will void the warranty, and may result in a non-airworthy
installation.
2.3 Installation Procedures
2.3.1 Note to Installers
The AA20-431 is intended for use as a cockpit-mounted control for an internal or
external aircraft PA system, where such a system is not installed to fulfill the
airworthiness requirements for the aircraft or an operating rule.
The AA20-431 is certified to RTCA DO-160C Section 20 (RF Susceptibility) Category T,
for installation in a well-protected electromagnetic environment such as an enclosed
These commodities, technology or software are controlled in accordance with the United States Export Administration Regulations, Export Classification
Control Number(ECCN) EAR99. When exporting, diversion contrary to U.S. law is prohibited.