Pilot's Guide

190-009663-02 Rev. B Garmin G1000 Pilot’s Guide for the Hawker Beechcraft C90A/GT/GTi 99
AUDIO PANEL AND CNS
SECTION 4 AUDIO PANEL AND CNS
4.1 OVERVIEW
The Communication/Navigation/Surveillance (CNS) system includes the audio panels, communication radios,
navigation radios, and Mode S transponders. The System Overview Section provides a block diagram description
of the Audio Panels and CNS system interconnection.
CNS operation in the Hawker Beechcraft C90A/GT/GTi is performed by the following Line Replaceable Units
(LRUs):
•PrimaryFlightDisplay(PFD)(2)
•MultiFunctionDisplay(MFD)
•IntegratedAvionicsUnit(2)
•AudioPanel(2)
•ModeSTransponder(2)
•ControlUnit
ThePFDandControlUnitcontrolsareusedtotunethecommunicationtransceiversandnavigationradios.
The two Audio Panels provide the traditional audio selector functions of microphone and receiver audio
selection. EachAudio Panelincludes atwopositionintercom system(ICS) betweenthe pilotand copilot,a
marker beacon system, and a COM clearance recorder. Ambient noise from the aircraft radios is reduced by a
feature called Master Avionics Squelch (MASQ). When no audio is detected, MASQ processing further reduces
the amount of background noise from the radios.
The Mode S Transponders are controlled with softkeys and the FMS Knobs. The TransponderData Boxis
locatedtotheleftoftheSystemTimeBox.Thedataboxdisplaystheselectedtransponder,theactivefour-digit
code, mode,andareplystatus(Figure4-1).
AUDIO PANEL VOLUME CONTROL
Adjusting the master volume control affects all radio audio volume and airframe type warnings that are heard
intheheadsets(notthespeaker)forthepilotorcopilotsideAudioPanel.RadioadjustmentsmadeonthePFD
controls to compensate for the master volume change on the Audio Panel also affect the radio levels for the other
pilot.IndependentradiovolumeadjustmentsmadeusingtheAudioPanelMasterVolumecontrolsaffectonly
the audio heard in the corresponding crew position headset.
Radio volume adjustments may be overridden by each crew position independently using the master volume
controlontheAudioPanelfortherespectivecrewposition.Inaddition,themastervolumecontrolforeach
Audio Panel affects all other system audio output to its designated crew position headset much like volume
adjustments found on many aviation headsets.