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one magneto in ground checks wllere only one spark plug fires in eacll
cylinder.
For optimum operation of the engine in cold weather, the appropriate
use of carburetor heat is recommended.
Indicated as a guideline:
(1)
Use carburetor heat duTing engine warm-up and ground check.
Full carburetor heat may UC! required for temperatures below 10°F,
whereas partial heat could be used in temperatures between 10°F
and 40°F.
(2)
Use the minimum carburetor heat required for smooth operation
in take-off, climb, and cruise.
When operating in sub-zero temperatures, care 'should be
exercised when using partial carburetor heat to avoid
iCing.
ature to the 32° to 70°F range where icing is critical under
certain atmospheric conditions.
(3)
If the aircraft is equipped with a carburetor air temperature
gage, it can be used as a reference in maintaining carburetor air
temperature at or slightly above the top of the yellow arc by appli
cation of carburetor heat.
(4)
Select relatively high manifold pressure and RPM settings for
optimum mixture distribution, and avoid excessive manual leaning in
cruising
f light.
(5)
Avoid sudden throttle movements during ground and flight opera
tion.
Refer to Section VII for discussion of additional cold weather equip
ment.
HOT WEATHER OPERATION.
The general warm temperature s tarting information on page 2 -9 is
appropriate. Avoid prolonged engine operation on
2-20
Partial heat may raise the carburetor air temper
The following procedures are
NOTE
ground.
the
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