190-02246-11
GI 275 Part 23 AML STC Maintenance Manual
Rev. 1
Page 2-9
2.4.4 GMU 11 Magnetometer
The GMU 11 Magnetometer senses the magnetic field and sends the data to the internal ADAHRS to
determine aircraft magnetic heading. This unit receives power directly from the GI 275 and communicates
with the AHRS board via RS-232. The GMU 11 is applicable to Class I & II aircraft only.
Figure 2-5 GMU 11 Magnetometer
2.4.5 GMU 44B Magnetometer
The GMU 44B Magnetometer senses the magnetic field and sends the data to the internal ADAHRS to
determine aircraft magnetic heading. This unit receives power directly from the GI 275 and communicates
with the AHRS via RS-485 and RS-232.
Figure 2-6 GMU 44B Magnetometer
2.4.6 GTP 59 OAT Probe
The GTP 59 is a remotely mounted temperature probe that interfaces to the internal ADC for OAT display
and true airspeed computations. The GTP 59 is mounted externally on the aircraft and is powered from the
GI 275.
Figure 2-7 GTP 59 Outside Air Temperature Probe
