Northern Airborne Technology AA85 - Manual (Page 56)

AA85 InterVOX II™ Intercom Manual SM38 Rev. 4.10
3.3.1
Mode switch
This red, three position toggle switch is used for selecting the intercom mode.
3.3.1.1
ALL
The ALL position connects all headsets and the ICS tie line. All headsets will hear
aircraft radio audio and music.
3.3.1.2
CREW
The CREW position separates the headset audio of the crew and passengers, and
isolates the intercom audio between the crew and passengers. Only the crew will hear
radio audio. Passengers and crew will still hear music. The ICS tie line connects with
the crew intercom only.
3.3.1.3
PLT ISO
The PLT ISO position isolates the pilot from all intercom and music functions. The
aircraft radio connects to the pilot’s mic and headset directly. The copilot and
passengers will not be able to hear the aircraft radio audio, but will retain intercom and
music functions and their connection to the ICS tie line.
CAUTION
In PLT ISO, the copilot position cannot transmit mic audio but
can still key the radio. This will cause the pilot’s microphone
to be live. If the copilot keys the radio, the music will mute
and the AA85 TX/ICS indicator will illuminate green.
3.3.2 VOX Controls
The AA85-001 has two independent VOX controls. The outer knob of the right hand dual
control is PAX VOX and controls the VOX level for all passengers. The outer knob of the
left hand dual control is CREW VOX and controls the VOX level for the pilot and copilot.
The VOX controls set the level of audio required to activate the microphones. When
either of the VOX controls is set fully ccw (LIVE), the associated microphone(s) will be
active at all times (Hot Mic). Ground operations, where little background noise is
present, commonly use this setting.
As the operator rotates the control in a cw direction the amount of audio required to
activate the microphone(s) increases. Noisy conditions, where ‘pilot fatigue’ may result,
commonly use this setting.
In system configurations that provide ICS PTT operation, the ICS PTT input will override
the VOX setting.
Page 3-2 Jun 9, 2004
ENG-FORM: 806-0106.DOT
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