190-01115-01 G3X/G3X Touch Installation Manual - Installation PreparationRev. AC Page 2-52.1.1.4 Outside Air TemperatureThe outside air temperature (OAT) probe used in the G3X system is the GTP 59. A minimum of one OATprobe is required, and is connected to the #1 ADAHRS. In an installation with multiple ADAHRS units, airtemperature data is shared via the CAN bus. Additional OAT probes may be connected to the otherADAHRS LRUs for redundancy, although this is not commonly done. Refer to Section 20 for GTP 59installation information.2.1.1.5 Pitot/StaticThe ADAHRS units in the G3X system must be connected to the aircraft’s pitot/static system. Theairframe manufacturer’s guidance should be followed to ensure proper location of the pitot tube and staticport.The GAP 26 pitot/AOA probe is a combination pitot tube and angle of attack (AOA) probe. It is availablein several configurations, including heated and unheated versions. Refer to Section 5 for GAP 26installation information.G3X ADAHRS units may also be used with any other pitot tube, if AOA is not required.Refer to Section 36 for information on conducting periodic tests of the static system.2.1.1.6 Angle of AttackThe G3X system is capable of sensing and displaying the aircraft’s current angle of attack (AOA) wheninstalled with a GSU 25 ADAHRS and a GAP 26 pitot/AOA probe. The GDU displays present on-screenAOA 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 Section 11 for GI 260 installation information.2.1.1.7 Engine InformationThe G3X system includes highly flexible capabilities for monitoring numerous engine sensors andparameters, and can support most piston and turbine engines, including twin-engine installations. Airframesensors such as voltage, fuel quantity, and discrete (switch/contact) inputs are also supported. Refer toSection 23 for engine application and sensor installation information, and Section 29, Section 30,Section 31, and Section 32 for engine/airframe sensor wiring information.The engine information system (EIS) unit for the G3X system is the GEA 24. The GEA 24 provides theability to monitor numerous analog, digital, and discrete signals from a variety of engine and airframesensors. 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. TheGEA 24 communicates with other LRUs via the CAN bus, and can optionally be connected to the MFDGDU via RS-232 for redundancy. For GEA 24 installation information, refer to Section 10. Forinformation on EIS sensor configuration and calibration, refer to Section 33 or Section 34.The GSU 73 also supports EIS inputs. Alternatively, a system that includes a GSU 73 may also use aGEA 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, toprovide additional notification of abnormal engine indications. Refer to Section 25 for information onconnecting annunciator lamps to GEA 24 or GSU 73 discrete output pins.
