Northern Airborne Technology AMU50-001 - Manual (Page 18)

AMU50-001 Audio Management Unit
SM76 Installation and Operation Manual
Section 2 Rev: 1.04
Issue 1 Page 2-6
ENG-FORM: 805-0120.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.4.6.3 High Priority Call Input (HIGH PRIORITY CALL IN)
When in ISO mode, if the High Priority Call Input is activated, the AMU50 causes the call indicators on all
ACPs to flash at a higher rate, and sends a High Priority Call tone to all headsets. The level of the High
Priority Call tone is configured for each ACP using the DevCs application.
This input is operational with the AMU50 configured in Normal mode only.
2.4.4.6.4 Isolation Override Input (ISOLATION OVERRIDE IN)
When in ISO mode, if the Isolation Override Input is activated, the AMU50 temporarily deactivates ISO
mode so that the cabin members can talk to the crew. The level of the ICS heard during ISO override is
configured for each ACP using the DevCs application.
This input is operational with the AMU50 configured in Normal mode only.
2.4.4.6.5 Alert Inputs (ALERT 1 thru ALERT 8)
The AMU50 supports eight discrete Aural Alert inputs; each can be configured for Active Hi or Active Lo
triggering. The configured logic (active Hi or active Lo triggered) for each Aural Alert is configured using
the DevCs application.
This input is operational with the AMU50 configured in all modes.
2.4.4.6.6 Aural Alert Inhibit (ALERT INHIBIT)
When the Aural Alert Inhibit input is activated, the AMU50 will mute all active Aural Alert messages. New
aural alerts that become active while the Aural Alert Inhibit input is active will be muted. Deactivating the
Aural Alert Inhibit input will cause any aural alerts that are still active to play.
This input is operational with the AMU50 configured in all modes.
2.4.4.6.7 Aural Alert Cancel (ALERT CANCEL)
If a cancellable alert is playing, activating the Aural Alert Cancel input will cancel the alert, even if the
trigger condition still exists. Even if the alert is cancellable, an alert will be played at least once before the
cancellation will take effect. A new cancellable alert triggered after the Aural Alert Cancel input is
activated will be unaffected. The DevCs application may be used to configure any Aural Alert generated by
the AMU50 as 'cancellable' or 'not cancellable'.
This input is operational with the AMU50 configured in all modes.
2.4.4.6.8 Weight On Wheels Input (WEIGHT ON WHEELS)
The Weight On Wheels input must be open circuit when the aircraft is in flight.
CAUTION:
The AMU50 will start up in Maintenance Mode if the Weight On Wheels input
is grounded and the USB port is active when power is applied to the unit. The
AMU50 must not be operated in maintenance mode during flight.