Northern Airborne Technology AMU50-001 - Manual (Page 23)

AMU50-001 Audio Management Unit
SM76 Installation and Operation Manual
Section 2 Rev: 1.04
Issue 1 Page 2-11
ENG-FORM: 805-0120.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
After the configuration settings have been uploaded, the USB connection must be removed and 28 Vdc
power to the AMU50 cycled to restart it in the operational mode. All settings that are essential to aircraft
operation must be verified by a system test in both normal and emergency modes (e.g. direct audio audible
to crew, transmit and receive functions on COM1 and COM2 operate correctly for crew, receive functions on
NAV1 and NAV2 operate correctly for crew, required intercom functions operate correctly, etc.).
2.5.2 DevCs Configurable Settings
The configuration settings available through the DevCs are listed below. For full information, refer to the
DevCs Installation and Operation manual.
2.5.2.1 AMU50
The software is used to designate which ACPs are included as crew during Isolation mode, selection of
call time-out and duration, the type of ICS tie line, and the error messages.
2.5.2.2 ACP Profiles
There are seven ACP Profiles (ACP1 through ACP6 and Virtual ACP), which are configured through the
DevCs and loaded into the AMU50. Each ACP profile is configured for Transceiver Access, Transmitter
Access, Receiver Access, Direct Audio Access, Direct Audio Levels, ISO CALL Functionality, Auto Receive
Levels, Call Tone Levels, Isolation Override, ICS Level, Audio Muting During Transmit (Direct Audios, Radio
Audio, ICS), VOX Preset Level, Transceiver Receive Audio Level After ACP Failure, Transceiver Receive
Audio Level, Receiver Receive Audio Level After ACP Failure, Receiver Receive Audio Level, ICS Level
After ACP Failure, ICS Level, VOX Level After ACP Failure, and Virtual VOX Level.
2.5.2.3 User Profiles
The User Profiles are parameters for each of the seven users which are configured through the DevCs
and loaded into the AMU50. Each User Profile consists of ACP Assignment (see 2.5.2.4 below), Music
Access, Music Level, Alert Access, Alert Level, Microphone Impedance (selected from a choice of three
values), Microphone Gain, Headphone Impedance, VOX Off Delay Time, and Alert Muting During
Transmit.
2.5.2.4 ACP Assignment
User 1 must always be assigned to ACP 1, and User 2 must always be assigned to ACP 2. Users 3 to 7
include the ability for each user to be assigned to an ACP or Virtual ACP.
ACP Assignment in a User Profile can be a ‘virtual’ ACP. The virtual ACP controls which audio sources
the user can listen to and at what level. The ‘virtual’ ACP also controls which radio a user can transmit on,
what audio is being muted during transmit, the level of the call tones and the level of the ICS audio when
isolation mode is temporarily suspended (ISO Override).
2.5.2.5 Cockpit Voice Recorder
The output volume level can be selected.