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10 rx/ics volume control, 11 iso/call button – Northern Airborne Technology ACP53-001 User Manual

Page 27

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ACP53-001 DACS Audio Control Panel

SM75 Installation and Operation Manual

Section 3 Rev: 1.00

Issue 1

Page 3-6

ENG-FORM: 806-0113.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

3.4.10

RX/ICS Volume Control

ICS

RX

ICS

RX


3.4.11

ISO/CALL Button

ISO

CALL

ISO

CALL

3.4.11.1

Crew/Passenger Talk Groups

Note: Confirm the specific criteria associated with this installation with your installing agency.


The communications management system provides the ability to decide which ACPs will be designated
as crew during ISO. Typically, up to three ACPs can be designated as crew (i.e. the users assigned to
those ACPs are members of the crew talk group) - all others are designated as passenger. Members of
the crew talk group can use the ISO/CALL button located on their Audio Control Panel to initiate and
cancel the talk group selection (ISO mode). On the passenger Audio Control Panels, the same button
acts as a CALL button.

3.4.11.2

ISO/CALL Button Operation

The way the ISO/CALL button functions is set up at installation and depends upon the communications
management system, such as the DACS.

In a DACS, only the crew-designated ACPs can be used to select ISO mode. On all non-crew (passenger)
ACPs, the ISO/CALL button will act as a CALL button only.

Members of the crew talk group are isolated from the remainder of the aircraft (passengers) when the
ISO/CALL button is pressed on a crew ACP. When ISO mode is active, all ISO indicators on all ACPs will
illuminate, as will any external isolation indicator. The crew talk group can communicate normally, and the
passengers can communicate amongst themselves but the two groups will not hear each other.

When the ISO/CALL button is pressed on a non-crew ACP and ISO mode is active, it operates as a CALL
button; the CALL LED will flash on all ACPs, and a chime will sound in all headsets.

When the ISO/CALL

button is pressed on a non-crew ACP and ISO mode is not active the button has no function.

To end ISO mode, press the ISO/CALL button again on one of the crew ACPs; the CALL and ISO
indicators extinguish and the chime function is deactivated.

The ISO/CALL button is a momentary push-button switch that can be used to enter ISO
mode (Crew only), or to call the crew when in isolation (ISO) mode.

Isolation means that the normal intercom audio communications path is temporarily
suspended. Isolation has no effect on any other audio source.

The master RX/ICS Volume control is a dual concentric knob. The upper (inner) knob
controls the ICS volume potentiometer, and the lower (outer) knob controls the master
receive volume for the unit.

Rotating the ICS knob cw will increase the ICS volume, and ccw will decrease the volume.

The master RX pot affects all Transceiver and Receiver receive volumes. All receive
volumes are reduced by 75% when it is rotated fully ccw, and increased proportionally as it
is rotated cw. When rotated fully cw, the master RX volume is set to maximum.