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CESSNA ECONOMY MIXTURE INDICATOR
The Cessna Economy Mixture Indicator is an exhaust gas temperature
(EGT) sensing device which visually aids the pilot in adjusting the cruise
mixture.
Exhaust gas temperature varies with fuel-to-air ratio, power
and RPM.
However, the difference between the peak EGT and the EGT at
the cruise mixture setting is essentially constant and this provides a useful
leaning aid.
Operating instructions are incl uded in Section n.
CARBURETOR AIR TEMPERATURE GAGE
A carburetor air temperature gage may be installed in the airplane
to help detect carburetor icing conditions.
yellow arc between _15° and +5°C.
retor temperature range where carburetor icing can occur; a placard on
the gage reads "KEEP NEEDLE OUT OF YELLOW ARC DURING POSSI
BLE ICING CONDITIONS."
Visible moisture or high humidity can cause carburetor ice formation,
especially in idle or low power conditions.
formation of ice is usually slow, providing time to detect the loss of
manifold pressure caused by the ice. .
rare since ,l:he full-open throttle condition is less susceptible to ice ob
struction.
If the carburetor air temperature gage needle moves into the yellow
arc during potential carburetor icing conditions, or there is an unexplained
drop in manifold pressure, apply full carburetor heat. Upon regaining the
original manifold pressure (with heat off), determine
the minimum amount of carburetor heat required for ice-free operation.
Carburetor heat should not be appl ied during take-off
unless absolutely necessary to obtain smooth engine
acceleration (usually in s ub-zero temperatures).
The gage is marked with a
The yellow arc indicates the carbu
Under cruising conditions, the
Carburetor icing during take-off is
NOTE
by
trial and error
7-11
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