TEXTRON
LYCOMING OPERATOR'S
MANUAL
0-360
and ASSOCIATED MODELS
SECTION
3
(3)
Climbing - When
climbing
at part throttle
power settings
of 80%
or above,
the carburetor
heat control
should be set
in the full
cold
position; however, if it is
necessary to use carburetor heat
to prevent
icing it is
possible for engine
roughness
to occur due
to the over-rich
fuel/air
mixture produced by the
additional carburetor heat.
When
this happens,
carefully lean
the mixture
with the mixture
control
only
enough to produce
smooth
engine operation.
Do not continue
to
use carburetor
heat after
flight is out of
icing conditions,
and
return
mixture to full rich when
carburetor heat is removed.
(4) Flight
Operation
- During normal
flight, leave
the carburetor
air
heat control
in the cold position.
On damp,
cloudy, foggy
or hazy
days,
regardless of
the outside air
temperatures,
look out for
loss of
power. This will be
evidenced by an unaccountable
loss in manifold
pressure
or RPM
or both, depending
on whether
a constant
speed or
fixed pitch propeller
is installed on the
aircraft. If this happens,
apply
full carburetor
air heat
and open the
throttle to limiting
manifold pressure and
RPM. This will result in
a slight additional
drop in
manifold pressure
which is
normal, and
this drop will
be
regained as the ice is melted
out of the induction system.
When ice
has been
melted from
the induction
system, the
carburetor heat
control
should be returned to
the cold position. In those
aircraft
equipped
with a carburetor
air temperature
gage,
partial heat
may be
used
to keep the
mixture temperature
above
freezing point
(32°F.).
WARNING
Caution must
be exercised when
operating
with partial heat
on aircraft
that do not
have a carburetor
air temperature
gage. It is
advisable, to use
either
full heat or no heat in
aircraft that are not equipped
with a
carburetor air
temperature
gage.
(5)
Landing Approach
- In
making a
landing approach,
the
carburetor
heat should
generally be
in the "Full
Cold" position.
However, if icing conditions
are suspected, the "Full
Heat" should
be applied.
In the case that
full power
need be applied
under these
conditions,
as for an aborted landing,
the carburetor heat should
be
returned to "Full
Cold" after full power application.
See the aircraft
flight
manual for specific
instructions.
3-11
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