Installation manual

GEM INSTALLATION MANUAL DOCUMENT No. 070906 REV. 1.3
INSIGHT
INSTRUMENT CORP. 2 BOX 122, FORT ERIE, ONTARIO, L2A 5M6
If You Read Nothing Else Read This page!
Follow these recommendations to minimize installation related problems.
USE CAUTION when crimping the terminals onto the end of the GEM harness. Test each crimp by
tugging on it sharply. It is almost impossible to pull off a properly crimped terminal.
KEEP the GEM harness at least 1 inch away from the ignition harness, P-leads, and alternator wiring.
Some aircraft produce electrical noise, which will cause erratic indications.
These displays are designed for rugged use. However, since they are constructed of computer-type
components, standard precautions for electronic equipment are required;
· Do not expose to rain or water.
· Handle with care - DO NOT DROP.
· Ensure that all electrical connections are correct and properly made.
· Observe electro-static discharge precautions.
The GEM can only do its job of performing accurate engine monitoring if the engine and airframe have a
good, solid, low-resistance electrical connection between them. Check for this with a careful visual
inspection of the aircraft's ground connections. A measurement with an Ohmmeter will reveal a gross fault
but a better test is to measure between the engine case and the airframe with a voltmeter with the engine
running and the electrical system under normal load. The voltage difference should be very small (millivolts).
Overlooking this important step can lead to a lot of unnecessary troubleshooting later.
Insight Instrument Corp. supports GEM installations with Insight thermocouple probes and harness. GEM
installations with probes and harnesses from other manufacturers are not supported.
GEM Installation Location Cautionary Notice
The G-series GEM graphic engine monitors have EGT, CHT and TIT primary STC. The GEM display must
be mounted so as to be clearly visible to the pilot. The GEM display should be mounted within the pilot’s
subpanel or the center panel and not on the copilots subpanel unless the GEM can be canted towards the
pilot.
GEM Fuel Totalizer Cautionary Notice
Please note that not all GEM models provide fuel data. The Fuel Remaining display on the GEM is very useful
but is not without limitations. Understand first that the factory fuel quantity gauges are the only instruments in
the panel that physically measure fuel level. They are still the primary indication of fuel level in the airplane.
The GEM doesn’t measure level, but instead measures only fuel flow rate. The GEM totalizes the rate
information to account for fuel used. If you know how much fuel you started with and how much you have used
you can figure fuel remaining by simple subtraction. The pilot must supply an accurate starting fuel level for
this subtraction to produce the correct fuel remaining result. Should the pilot overstate the fuel quantity on
board, the GEM will dangerously overstate the fuel remaining and the endurance time as well. The pilot must
be careful and diligent when setting the fuel on board. (Cont'd)