190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 21-24
3. Routing - Line fittings, routing, alignment, bonding, and support spacing should be installed as
defined in the aircraft maintenance manual or Section 8-31 of AC 43.13-1B, Aircraft Inspection
and Repair
4. Mount the sensor using one of the two methods noted above.
5. Refer to the applicable engine manual to identify the appropriate connecting port on the engine for
the parameter being sensed. The male threads on Kavlico sensors are designed to mate with a 1/8”
NPT female thread. The female threads on UMA sensors are designed to mate with a 1/8” NPT
male thread. Thread sealant or tape should be used for the NPT threads. To reduce the risk of
system contamination, a minimal amount of sealant or tape should be applied leaving at least two
threads at the end of the fitting clear of all sealant/tape.
WARNING
The fuel and oil pressure fittings on the engine port should have a restrictor hole where
appropriate to minimize potential fluid loss in the event of breakage.
NOTE
A restrictor or snubber fitting (not available from Garmin) may be installed (between the
hose and the sensor) to dampen manifold pressure fluctuations. One example is the PS-8G
fitting from Omega Engineering.
6. Connect the supplied connector to the appropriate inputs of the GEA 24/GSU 73 as referenced in
the Sensor Interface Drawings in Section 27
through Section 29. Secure the connector and wire
assembly to an appropriate location in the engine compartment to provide strain relief.
NOTE
Kavlico P4055 pressure sensors use Packard Metri-Pack 150 connectors.
7. To avoid fuel pressure sensor damage or rupture, verify the aircraft fuel system nominal and surge
pressures will not exceed the rated operating pressure of the sensor. Verify that pressure caused by
thermal expansion of fuel in the pressure sensor line is not trapped by the fuel shut-off valve or
other components.
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