190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 2-6
2.1.1.7 Engine Information
The G3X system includes highly flexible capabilities for monitoring numerous engine sensors and
parameters, and can support most piston and turbine engines, including twin-engine installations. Airframe
sensors such as voltage, fuel quantity, and discrete (switch/contact) inputs are also supported. Refer to
Section 21
for engine application and sensor installation information, and Section 26, Section 27,
Section 28
, and Section 29 for engine/airframe sensor wiring information.
The engine information system (EIS) unit for the G3X system is the GEA™ 24 engine interface module.
The GEA 24 provides the ability to monitor numerous analog, digital, and discrete signals from a variety of
engine and airframe sensors. Multiple GEA 24 units may be installed in order to monitor large piston
engines, or for twin-engine applications. The GEA 24 also supports a digital interface to a number of
FADEC (Full Authority Digital Engine Control) engines. The GEA 24 communicates with other LRUs
using the CAN bus, and can optionally be connected to the MFD GDU by RS-232 for redundancy. For
GEA 24 installation information, refer to Section 7
. For information on EIS sensor configuration and
calibration, refer to Appendix H
or Section 30. If replacing a GEA 24 with a GEA 24B, please review the
guidance in Section 32.2.5
.
The GSU 73 also supports EIS inputs. Alternatively, a system that includes a GSU 73 may instead use a
GEA 24 for EIS, if the GEA 24 is wired as EIS LRU #2.
The GEA 24 and GSU 73 can drive external annunciator lamps for Master Caution and Master Warning, to
provide additional notification of abnormal engine indications. Refer to Section 23
for information on
connecting annunciator lamps to GEA 24 or GSU 73 discrete output pins.
2.1.1.8 GPS
Each GDU display includes an internal VFR GPS receiver, and a connection for an external antenna. GPS
position data is shared between GDU displays using the CAN bus. For a list of GPS antennas supported by
the GDU display, refer to Appendix E,
or Section 6.
The GPS 20A is a TSO-compliant WAAS GPS position source that is compatible with the G3X system.
The GPS 20A provides GPS data to the G3X system using the CAN bus, and can send ADS-B position
data to a transponder using RS-232. For GPS 20A installation information and a list of supported GPS
antennas, refer to Section 15
.
GPS data is used for ADAHRS performance monitoring, so at least one source of GPS data is required.
This requirement can be met by installing a GPS 20A, or by connecting a GPS antenna to at least one GDU
GPS receiver. A GTX Series Transponder with built-in GPS, or a GNX 375 connected to the system will
also satisfy this requirement. In a system with multiple GDU displays, additional GPS antennas may be
connected to the other displays for redundancy, if desired.
The G3X system is capable of displaying basic position data from an external IFR GPS navigator, but this
data is not used for ADAHRS monitoring and thus does not satisfy the above requirement.
For general GPS antenna installation information, refer to Section 20
.
2.1.1.9 ARINC 429
ARINC 429 is an industry-standard data bus format that is primarily used with IFR GPS or GPS/NAV
receivers (see below). The GAD 29 is the primary ARINC 429 data adapter for the G3X system; the
GSU 73 also supports ARINC 429 input/output. ARINC 429 data is relayed to and from the rest of the
G3X system using the CAN bus. For GAD 29 installation information, refer to Section 4
.
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