Garmin G1000 King Air C90GT - Manual (Page 111)

190-009663-01 Rev. A Garmin G1000 Pilot’s Guide for the Hawker Beechcraft C90A/GT 97
AUDIO PANEL AND CNS
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL
FEA
TURES
APPENDICES
INDEX
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 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.