Systems Description Model G58
Section 7
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automatically pop up to allow the viewing of the parameter that
has been exceeded. The MFD is powered by the Right Bus
through the Avionics Master relay and is protected by a circuit
breaker, placarded MFD, located on the Avionics Circuit
Breaker Panel. See the Garmin G1000 Multi Function Display
Pilot’s Guide for more detailed information.
MASTER AUDIO PANEL (GMA)
The audio panel is a Garmin GMA 1347 and provides pilot and
copilot microphone selection of communication radios and
audio selection for all communication and navigation receiver
radios. The audio panel has volume controls for both pilot and
copilot. There are controls for speaker on/off selection and
interphone mode selection. If power is lost to the audio panel,
the pilot’s headset and microphone are connected directly to
COMM 1. An internal clearance recorder can play back the last
2 1/2 minutes of received COMM audio. A marker beacon
receiver is also contained within the audio panel with visual
information provided on the PFD. The red button at the bottom
of the audio panel is used to manually select the reversionary
mode for the PFD and MFD displays. The GMA is powered by
the Right Bus through the Avionics Master relay and is pro-
tected by the 5-amp AUDIO MKR circuit breaker located on the
Avionics Circuit Breaker Panel. See the Garmin G1000 Audio
Panel Pilot’s Guide for more detailed information.
INTEGRATED AVIONICS UNITS (GIA)
Two Garmin Integrated Avionics Units (GIA 63/63W) are
installed. Both GIAs provide interfaces to all Line Replaceable
Units (LRUs) in the G1000 system. Each GIA contains VHF
COMM, VHF NAV, glideslope, and GPS functions. GIA 1 pro-
vides autopilot mode control and servo control and monitoring.
GIA 2 provides servo control and monitoring. The No. 1 GIA is
powered by the Left Bus. The COMM portion is protected by
the 5-amp COMM 1 circuit breaker and the other portions are
protected by the 5-amp INTEG AVION 1 circuit breaker. The
No. 2 GIA is powered by the Right Bus through the Avionics
May, 2015
58-590000-67A12_sec07.fm Page 66 Wednesday, May 27, 2015 8:58 AM
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