Garmin G3X Installation Manual page 122

8.2.12 Carburetor Temperature Sensor
UMA 1B10R - Threaded ¼-28 Platinum Resistance Temperature Detector (RTD) probe. This sensor is
applicable to all carbureted Lycoming and Continental engines.
Rotax 965531 - This sensor is applicable to all carbureted Rotax engines. Refer to Rotax Installation
Instructions for complete installation details.
8.2.12.1 Lycoming and Continental Engine Installation
General Installation Guidance:
1. Locate and remove the threaded ¼-28 brass plug (Figure 8-19 and Figure 8-20) on the side of the
carburetor as shown in Figure 8-19. If a threaded plug is not present (as is the case with many
older carburetors), consult the engine and/or carburetor manufacturer for instructions on how to
drill and tap the lead plug adjacent to the butterfly valve.
2. Install a very small amount of thread lubricant on the probe threads and insert into the carburetor
(Figure 8-21).
3. Connect the supplied connector to the appropriate inputs of the GSU 73 as referenced in the G3X
interconnects in Appendices H and I. Secure the connector and wire assembly to an appropriate
location in the engine compartment to provide strain relief.
Figure 8-19. Carb Temp
Sensor Mounting Location
8.2.13 Position Sensor
Sensor Description – Integrated trim servo with position sensor or standalone slide potentiometer (0 – 5
KOhm variable resistor)
General Installation Guidance – Each position sensor installation will vary widely according to the
aircraft, motion being sensed, and mechanical installation. For trim servos with integrated position
sensing, no external position sensor is required. If mechanical trim is used or no trim servo is present on
a particular system (i.e. flaps), then a standalone position sensor can be used. A standalone position
sensor should ideally be mounted such that the full travel of the sensor corresponds with the full travel of
the control surface.
Refer to the supplied servo or sensor installation manual and G3X interconnects in Appendix G for proper
wiring connections. Section 8.3.3 provides calibration instructions.
Page 8-18
Revision E
Figure 8-20. Carb Temp
Sensor Mounting Location
w/ Screw Removed
G3X Installation Manual – Engine Sensor Installation and Configuration
Figure 8-21. Carb Temp
Sensor Installed
190-01115-01