Figure 4-41 Slick Magneto Vent Hole; Cht, Egt, Tit Probes - Garmin GI 275 Installation Manual

For Slick magnetos, the magnetic pickup must be installed in the vent hole furthest from the distributor
cap. Refer to Figure 4-41.
Following the installation of the P-Lead signal wires, verify the continuity of each magneto P-Lead to
ground while the ignition key is off. If there is evidence of discontinuity in the magneto P-Lead grounding
circuit, it must be corrected before further engine maintenance or checks. Continuity can only be measured
if the magneto points are open or the wire is disconnected from the magneto. Use a magneto timing light to
ensure the ohmmeter will not measure false continuity through the points or coil windings.
CAUTION
Do not turn the propeller and stay clear of the propeller arc when installing the P-Lead
signal wires.
WARNING
The P-Lead sensor wiring must include the resistors as shown in Appendix B. The resistors
prevent magneto shut-off in the event of a shorted RPM P-Lead wire. The resistors must be
installed as close as practical to the P-lead connection, near either the magneto or the
ignition switch.
4.6.7

CHT, EGT, TIT Probes

Garmin stocks certain probes to simplify the EIS sensor ordering process. Sensor part numbers are cross-
referenced with Alcor STC SA522SW part numbers. The GI 275 STC does not provide installation
approval for CHT, EGT, and TIT probes; however, the data in STC SA522SW is adequate for many
installations.
190-02246-14
Rev. 11

Figure 4-41 Slick Magneto Vent Hole

GI 275 STC EIS & MFD Installation Manual
Page 4-51