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a)
Install the Cabin PA system and remote amplifier(s) and speaker(s) as applicable, and then power
up the ship's systems. Turn on all of the radios and other accessories required for this system.
Check that the POWER ON LED on the AA21-400 illuminates when the power switch is selected
to ON.
b)
From the front panel switches, select PA and EXT. Key the siren using the front panel switch and remote
Siren key as described in Section 3.4.4.1. The siren should sound on the external PA speakers, and the
level should be at maximum volume (the VOL control fully cw). If the siren rate needs adjustment use the
corresponding trimpot on the top of the AA21-400. Refer to section 2.3.6.1 for details.
c)
Configure the audio system as required to allow connection of the pilot's mic to the PA and key the
cyclic switch for transmit. The mic audio should be heard on the PA speakers. Adjust the front
panel level control for the desired volume. Set the front panel switch to RADIO, and check for
correct radio operation and note what volume settings will produce a suitable external paging level.
USE CARE TO AVOID FEEDBACK INTO THE MICROPHONE!
Note:
A faint audio signal may be heard at the speaker (even when the system is not paging) due to the
very high gain of this system and stray coupling in the wiring. It should not be audible in flight.
2.3.6
Adjustments and Connections
The unit ships from the factory with all internal adjustments set to the normal test levels. Once installed in
the aircraft, it may be desirable to change some of these settings to best suit the local operating
environment. The internal adjustments are accessible through holes located on the top of the unit.
Sweep Rate
Adjustments
Build Standard: 5.00
ENG-FORM: 805-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
AA21-400 Cabin PA System
SM34 Installation and Operation Manual
Level Adjustments
Nov 09, 2016
Configuration
Jumpers
Page 2-3
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