190-01115-01
G3X/G3X Touch Installation Manual - Installation Preparation
Rev. AC
Page 2-5
2.1.1.4 Outside Air Temperature
The outside air temperature (OAT) probe used in the G3X system is the GTP 59. A minimum of one OAT
probe is required, and is connected to the #1 ADAHRS. In an installation with multiple ADAHRS units, air
temperature data is shared via the CAN bus. Additional OAT probes may be connected to the other
ADAHRS LRUs for redundancy, although this is not commonly done. Refer to
for GTP 59
installation information.
2.1.1.5 Pitot/Static
The ADAHRS units in the G3X system must be connected to the aircraft’s pitot/static system. The
airframe manufacturer’s guidance should be followed to ensure proper location of the pitot tube and static
port.
The GAP 26 pitot/AOA probe is a combination pitot tube and angle of attack (AOA) probe. It is available
in several configurations, including heated and unheated versions. Refer to
installation information.
G3X ADAHRS units may also be used with any other pitot tube, if AOA is not required.
Refer to
for information on conducting periodic tests of the static system.
2.1.1.6 Angle of Attack
The G3X system is capable of sensing and displaying the aircraft’s current angle of attack (AOA) when
installed with a GSU 25 ADAHRS and a GAP 26 pitot/AOA probe. The GDU displays present on-screen
AOA information, and also generate AOA audio alerts.
The optional GI 260 AOA indicator can also be added to provide a separate heads-up indication of AOA.
Refer to
for GI 260 installation information.
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
for engine application and sensor installation information, and
,
for engine/airframe sensor wiring information.
The engine information system (EIS) unit for the G3X system is the GEA 24. 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 engines. The
GEA 24 communicates with other LRUs via the CAN bus, and can optionally be connected to the MFD
GDU via RS-232 for redundancy. For GEA 24 installation information, refer to
. For
information on EIS sensor configuration and calibration, refer to
.
The GSU 73 also supports EIS inputs. Alternatively, a system that includes a GSU 73 may also 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
for information on
connecting annunciator lamps to GEA 24 or GSU 73 discrete output pins.