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CHEROKEE 140 "D"
SECTION
III
CRUISING
The
cruising
speed
is determined by
many
factors including power
setting,
altitude,
temperature,
loading
and equipment
installed
on the
airplane.
The
normal
cruising
power
is 75% of the
rated
horsepower
of
the
engine. True airspeeds
which
may
be
obtained
at
various
altitudes
and
power
settings
can
be determined from
the
charts
in
Section
IV of this
handbook.
The tachometer
on the Flite
Liner
has
a white
radial
line
set at
2265
RPM
which
indicates
the setting
for 60% power
at
3500 feet
pressure
altitude.
In conjunction
with
this there
is
an adjustable
detent
plate located
on the throttle
quadrant for
the throttle
lever
to rest
against.
The
detent plate is located by
setting
up
60%
(2265
RPM)
power
at
3500 feet pressure
altitude,
adjusting
the
detent plate
against
the
throttle
lever,
then tightening
the two mounting
screws.
If
it
should
be desirable
to set
up
a
60% power
setting at either sea
level
or 7000
feet,
the extremities
of arcs on
either
side of this radial
give
this
position.
For settings
in between
those
points
the Power vs.
Density
Altitude
graph in
this
handbook
will supply
the
desired
RPM.
Use
of
the
mixture
control
in
cruising
flight
reduces
fuel
consumption
significantly,
especially
at
higher
altitudes.
The
mixture
should
be leaned during
cruising
operation
above 5000
feet
altitude
and
at
pilot's discretion
at
lower
altitudes
when 75%
power
or
less is being
used. If any
doubt
exists
as to the amount
of
power being
used,
the
mixture
should
be in
the FULL RICH
position for
all
operations
under
5000 feet.
To
lean
the mixture,
pull
the mixture
control
until the engine
becomes
rough,
indicating
that the
lean
mixture
limit has been
reached
in
the
leaner
cylinders.
Then enrich the mixture
by pushing
the control
towards
the
instrument panel
until engine operation
becomes
smooth.
The
continuous
use
of
carburetor
heat during
cruising
flight
decreases
engine
efficiency.
Unless
icing
conditions
in
the
carburetor
are severe,
do
not cruise
with
the
heat
on. Apply
full
carburetor
heat
slowly
and only
for
a
few
seconds
at
intervals determined by icing
severity.
711102
19
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