Cessna 182T 2001, Pilot Operating Handbook

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CESSNA SECTION 7
MODEL 182T AIRPLANE & SYSTEMS DESCRIPTION
The EGT/CHT indicator, located on the left side of the instrument
panel, is activated by electrical signals originating in the engine
compartment. Markings for the exhaust gas temperature portion of
the indicator are in 25°F increments, with no range markings or red
lines. Marking for the cylinder head temperature portion of the
indicator are in 50°F increments, with numbers at 200°F, 300°F,
400°F and 500°F. Normal operating temperatures (green arc) for
the CHT indicator are 200°F to 500°F, with red line at 500°F.
EGT signals are generated from a thermocouple probe in the
exhaust system. This probe allows a small amount of current to flow
through it, and as temperature across the probe changes, so does
current flow. This change in current flow registers on the indicator
as a change in temperature. Although the EGT gauge contains no
red lines or operating range marks, it is useful in establishing peak
EGT and cruise EGT reference points for leaning the mixture.
CHT signals are generated from a thermistor probe screwed into
the cylinder head of the number 1 (right hand forward) cylinder. The
resistance of the probe changes in proportion to the temperature,
and is registered on the indicator as a change in temperature.
The engine driven mechanical tachometer is located on the right
side of the pilot's instrument panel. The instrument is marked in
increments of 100 RPM, and indicates both engine and propeller
speed. An hour meter in the lower section of the dial records
elapsed engine time in hours and tenths. Instrument markings
include the normal operating range (green arc) of 2000 to 2400
RPM, and a maximum (red line) of 2400 RPM.
Apr 30/01 7-21