190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 2-5
2.1.1.3 Magnetometer
The G3X system requires a minimum of one magnetometer (magnetic field sensor) to provide the
ADAHRS unit(s) and/or G5 standby display(s) with magnetic field information. In an installation with
multiple ADAHRS units, magnetometer data is shared by the CAN bus. When multiple ADAHRS units
are installed, additional magnetometers may be installed for redundancy, although this is not commonly
done. In a G3X Touch system with a G5 but no ADAHRS units, only a single magnetometer is supported.
Several different magnetometers are supported:
The GMU 11 magnetometer connects to the G3X system using the CAN bus. Refer to Section 13 for
GMU 11 installation information. The GSU 73 does not support the GMU 11.
The GMU 22 magnetometer
connects to the ADAHRS LRU using RS-232 and RS-485 interfaces. Refer to
Section 14
for GMU 22 installation information. The GMU 44 is also supported and is functionally
identical to the GMU 22.
Refer to Appendix B
for magnetometer placement information.
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 by the CAN bus. Additional OAT probes may be connected to the other
ADAHRS LRUs for redundancy, although this is not commonly done. Refer to Section 18
for GTP 59
installation information.
In a G3X Touch system with one or more G5 displays but no ADAHRS units, a GTP 59 can optionally be
connected by the GAD 13 temperature probe adapter. If the system is later expanded with the addition of
one or more ADAHRS units, the GAD 13 may be retained, or the GAD 13 may be removed and the
GTP 59 connected to the #1 GSU 25 ADAHRS unit. Refer to the G5 installation manual (190-02072-01)
for GAD 13 information.
2.1.1.5 Pitot/Static
The ADAHRS units (and optional G5 displays) in the G3X system must be connected to the aircraft’s
pitot/static system. The airframe manufacturer’s guidance should be followed to find the 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 Section 5
for GAP 26
installation information.
G3X ADAHRS units and G5 displays may also be used with any other pitot tube, if AOA is not required.
Refer to Section 32
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 Section 9
for GI 260 installation information. The angle of attack sensor can be calibrated to
compensate for flap position, which requires either a flap position sensor or a dedicated discrete input.
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