Description; Introduction; Purpose Of Equipment; Features - AEM SM10 Installation And Operation Manual

1.1

Introduction

This manual contains information on the AA31-001 and AA31-002 ICS Mode Controllers. All derivative
products will be covered by manual supplements, which can be obtained from AEM as required.
Information in this section consists of purpose of equipment, features and specifications.
1.2

Purpose of Equipment

The AA31 ICS Mode Controller provides a convenient, centralized method of organizing the aircraft audio
system into multiple intercom circuits for independent or common operation. This function is especially
valuable for EMS and law enforcement applications, where several independent operations occur within the
aircraft that often require isolation from each other, while retaining the ability to share common communication.
The AA31 can provide ICS switching for three or four AEM Audio Controllers, or other AEM products
incorporating an ICS TIE LINE. The AA31 also has provisions for driving external annunciators and interfacing
for ICS Calling.
1.3

Features

Front panel annunciators provide positive indication of the ICS mode selection. The LED on the right of
the ICS Function Knob lights green to indicate ICS Function is ALL COMMON. The LED on the left of the
ICS Function Knob lights amber to indicate that any of the ICS functions are in the ISO (isolated) position.
The AA31 has four annunciator outputs, one output for each ICS Function. The outputs on the AA31-002
can drive the Isolated Warning inputs on an AEM Audio Controller. The outputs on the AA31-001 and
AA31-002 can drive external lamps.
The AA31 provides load matching so that the ICS Levels will not change as the ICS Function is changed.
When the AA31 isolates an Audio Controller's ICS Tie Line, it connects a resistor, equal to the load of the
ICS Tie Line, in place of the isolated Audio Controller.
The REAR CALL annunciators illuminate when a rear call signal is activated.
ICS Function switching is a passive circuit, so it will continue to operate with no power to the AA31. The
annunciators and outputs will fail without power.
April 14, 2012 Rev: 5.00
ENG-FORM: 800-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
AA31 ICS Mode Controller
SM10 Installation and Operation Manual
Section 1.0 Description
Page 1-1