Cessna T182 1982 Pilot Operating Handbook page 149

SECTION 7 CESSNA
AIRPLANE
&
SYSTEMS DESCRIPTIONS MODEL T182
The cylinder head temperature gage, below the left fuel quantity
indicator, is operated by an electrical-resistance type temperature sensor
on the engine which receives power from the airplane electrical system.
Gage markings indicate the normal operating range (green arc) which is
200°F (93°C) to 500°F (260°C) and the maximum (red line) which is 500°F
(260°C).
The engine-driven mechanical tachometer is located on the lower right
side of the instrument panel. The instrument is calibrated in increments of
100 RPM and indicates both engine and propeller speed. An hour meter
below the center of the tachometer dial records elapsed engine time in
hours and tenths. Instrument markings include a normal operating range
(green arc) of 2100 to 2400 RPM, and a maximum (red line) of 2400 RPM.
The manifold pressure gage is the left half of a dual-indicating
instrument located on the right side of the instrument panel above the
tachometer. The gage is direct reading and indicates induction air mani­
fold pressure in inches of mercury.
It
has a normal operating range (green
arc) of 17 to 25 inches Hg, and a maximum (red line) of 31 inches Hg.
The fuel pressure gage is the right half of the dual-indicating instru­
ment located on the right side of the instrument panel above the tachome­
ter. The gage indicates fuel pressure to the carburetor. Gage markings
indicate that minimum pressure is 3.0 PSI (red line), normal operating
range is 3.0 to 30 PSI (green arc), and maximum pressure is 30 PSI (red
line).
The economy mixture (EGT) indicator is located on the right side of the
instrument panel. A thermocouple probe in the left exhaust collector
assembly measures exhaust gas temperature and transmits it to the
indicator. The indicator serves as a visual aid to the pilot in adjusting the
mixture during cruise as described in Section 4. Exhaust gas temperature
varies with fuel-to-air ratio, power, and RPM. However, the difference
between the peak EGT and the EGT at the desired mixture setting is
essentially constant and this provides a useful leaning aid. The indicator is
equipped with a manually positioned reference pointer which is especially
useful for leaning during climb.
The carburetor air temperature gage is located on the left side of the
instrument panel below the gyros to help detect carburetor icing condi­
tions. The gage is marked in 5° increments from -30°C to 30°C, and has a
yellow arc between -15°C and 5°C which indicates the temperature range
most conducive to icing in the carburetor. With the heat available from (
turbocharging, the gage needle will normally run off the scale on the high
end for most operations. A placard on the lower half of the gage reads:
KEEP NEEDLE OUT OF YELLOW ARC DURING POSSIBLE CARBURE­
TOR ICING CONDITIONS.
7-18
21 August 1981