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3.1
Introduction
Information in this section consists of the functional and operational procedures for the AA21-400 Cabin PA
system.
3.2
Operation Specifics
The AA21-400 Cabin PA system provides a central adjustment for internal and/or external aircraft paging
functions. The AA21-400 is a self-contained amplifier that directly drives the cabin speaker(s) and/or the
external PA system amplifier. When turned on, the system is ready for operation and will accept audio
feeds or a microphone input. An internally generated siren is also available in WAIL or YELP modes. When
the AA21-400 is turned on, a 28 Vdc switched signal is generated. This signal is used to turn on the PA
amp relay (if connected in system). The high current DC power to operate the PA110/220 or PA250/700 is
supplied by the aircraft.
3.3
Techniques of Voice Transmission
To successfully project the human voice over long distances, it is necessary to develop a microphone
technique different from the usual conversational manner. Place the microphone with the upper lip touching
the mouthpiece and talk clearly and distinctly, with increased emphasis.
noticeable pauses and keep the voice level constant. A medium pitched voice is more easily understood
and carries farther than a bass voice.
3.4
Basic Operation
3.4.1
Power Up
To activate the AA21-400 Cabin PA system, flip the POWER toggle switch up to the ON position. The LED
adjacent to the switch should illuminate.
Build Standard: 5.00
ENG-FORM: 806-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
AA21-400 Cabin PA System
SM34 Installation and Operation Manual
Section 3.0 Operation
Power Switch
Nov 09, 2016
Separate each word with
Indicator LED
Page 3-1
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