Northern Airborne Technology ACP51-100 - Manual (Page 26)

ACP51-100 DACS Audio Control Panel
SM81 Installation and Operation Manual
Section 3 Rev: 1.00 Issue 1 Page 3-5
3.3.10.2 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.
3.3.11 ISO Indicator
ENG-FORM: 806-0113.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
The ACP51 has a dead-front CALL indicator that flashes to signify that another user is
calling when the system is in ISO mode.
ISO
3.3.12 CALL Indicator
The CALL Indicator will flash once per second for a Normal call and at 3 times per second
for a High
Priority call.
3.3.12.1 Call Priority
When the ISO mode is selected by the crew, a passenger may use the ISO/CALL button on their ACP51
(or an external remote switch) to contact the crew.
The ISO/CALL button on each passenger ACP51 can be designated either a Normal Call, High Priority
Call, or Isolation Override at installation. Any remote switch will be wired to have a preset priority status.
CALL
The ACP51 has a dead-front ISO indicator that will illuminate when Isolation mode has been
selected.
If the switch is designated a Normal or High Priority call, a call will be indicated in the crew unit(s) along
with a call tone in all users phones. The crew can then cancel ISO mode to acknowledge the call; or if the
call is not answered it can either continue, or be set at installation to time out.
If the ISO/CALL button is designated with an Isolation Override functionality, the Isolation Mode is
temporarily suspended and the passengers can communicate with the crew members.