Northern Airborne Technology AA12 - Manual (Page 37)

SM21 Rev. 4.10 AA12 Compact Audio Controller Manual
Section 3 Operation
3.1 Introduction
Information in this section consists of the functional and operational procedures for the
AA12 Compact Audio Controller, and is applicable to the AA12-001, the AA12-002 and
the AA12T-002 unless otherwise noted.
3.2 General
The AA12 is a compact audio controller that provides full boom microphone (MIC)
support and high performance audio for up to six crew positions with VOX, LIVE and
KEYED ICS capability. Boom MIC control is provided for pilot and copilot transmit
capability, with the pilot retaining priority. Muting of the entertainment and/or intercom
audio is accomplished during the various operational modes, providing improved
intelligibility of the audio delivered to the user.
3.3 Radio Selection
3.3.1 Receive Audio – AA12-001
RX Select Switches
Annunciator TX Select Switch
The AA12-001 is typically configured to select the receive (RX) audio from three
transceivers and up to four additional receivers. The RX select switches are centre-off
toggle switches.
Receiver audio can be selected by setting the applicable RX select switch to the down
position, and transceiver audio can be selected by setting the applicable RX select
switch to the up position, or as a function of the transmit (TX) select switch. The
transceiver that is selected by the TX select switch is automatically selected for receive
as well.
An additional Direct Audio input (unswitched) is provided for airframe warning, rad alt, or
other high priority audio signal.
Sep 9, 2004 Page 3-1
ENG-FORM: 806-0106.DOT
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