Installation manual

GEM INSTALLATION MANUAL DOCUMENT No. 070906 REV. 1.4
INSIGHT
INSTRUMENT CORP. 3 BOX 122, FORT ERIE, ONTARIO, L2A 5M6
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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)
When the aircraft is filled prior to takeoff, the number is the total available on board. If partially filled to a
known configuration (ex. tips empty) then the total is easy to calculate.
However if tanks are partially filled on top of a poorly known original value - errors will abound. Unaccounted
fuel loss from leakage, fuel vent overflow or theft will of course produce erroneous results.
Be careful and the GEM will deliver safe, reliable, and convenient fuel information. But be sure to cross
reference the information on the primary fuel quantity gauges. Never trust a single source of fuel information
when you have two on board. Fuel exhaustion still ranks highly among accident causes.
Don’t let your engine stop until you’re parked.
GEM Engine Temperature Limits (Redlines) Cautionary Notice
Most air-cooled aircraft engines have a maximum allowable Cylinder Head Temperature (CHT) limit specified
by the engine or aircraft manufacturer. Similarly if the engine is Turbo-charger equipped a maximum
allowable Turbo-charger Inlet Temperature (TIT) limit will be specified (may be labeled as EGT). Most GEM's
have 460 F and 1650 F internally set as the CHT and TIT limits as these are the most common values, but
there are aircraft that require different values. Be sure to follow the instructions in this document to install the
correct Insight P/N so that the GEM's Redlines match the aircrafts specified maximum engine temperatures.
Warranty policy
The Insight Instrument Corp.’s Graphic Engine Monitor temperature display unit is warranted against
defects in materials and workmanship for two years from date of purchase. Insight Instrument Corp.’s
temperature probes are warranted for one year from date of purchase or 100 hours whichever comes
first.
Insight will, at its option, repair or replace, without charge, those products that it finds defective. Material re-
turned for repair or replacement will be returned prepaid by second day freight. Insight will not be
responsible for repairs that result from improper installation, unauthorized maintenance or abuse.
Insight is not liable for consequential damages or any labor costs, either directly or indirectly.
No other warranty is expressed or implied.