Specifications

CHEROKEE SIX
-
3OO
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
7 57o
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
rnixture,
disengage lockr and
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
fuel
flow
meter will
give
a
close
approximation of
the
fuel
being
consumed.
If
the airplane is
equipped with
the optional
exhaust
gas
temperature
(EGT)
gauge,
a
more
accurate
means of
leaning
is available to the
pilot.
Fbr
this
procedure,
refer
to
the
"Avco-Lycoming
Operator's Manual."
ln
order to
keep the airplane
in best
lateral
trim during
cruise flight, the
fuel
should be
used
alternately
from
each
main tank, and when these
are
nearly
exhausted,
from
each tip
tank.
It
is
recommended
that
one
main
tank be used for
one hour
after takeoff,
the
other
main tank
used until
nearly exhausted,
then retum to the
first
main
tank. When nearly
exhausted, turn to
one
tip tank
and alternate at
one-half hour
intervals to maintain lateral
trim.
The following listing
contains, as a reminder,
a few
of
the
more highly recommended
fuel
operation
procedures:
l. Fuel
quantity
should be
visually
checked in all
fuel tanks before
entering
the aircraft.
2.
After using the undeneat
quick
drain,
it should
be
checked
from
outside
the
aircraft
to make sure it
has closed
completely,
and
is not leaking.
3. Takeoff
should be mide
on the
tank
with
the highest
quantity
of fuel
to
assure
best
fuel
flow,
and
this tank selected
before or immediately
after
starting
in
order to allow
fuel
flow
to
be adequately
established
before
takeoff.
The
tank with
the highest
quantity
of
fuel
strould
be selected for
landing.
Fuel
tank
selection
at
low
altitude
is
not
recommended,
since little recovery
time
is
available in
the event
of
an
elTor in
tank selection.
When
switching tanks,
make
sure
that
the selector drops
into a detent,
and
is
lined
up with
the
desired tank.
The electric fuel
pump
should
be turned
on before
switching tanks, and should be left
on for a short
period
thereafter.
To
preclude
making
a hasty selection, and
to
provide
continuity of
flow,
the
selector
should
be
changed
to
another tank before
fuel
is
exhausted
from
the tank in use.
Operation
of
the
engine driven
fuel
pump
should be
checked
while
taxiing or
during
pretakeoff
engine
run
up
by
switching
off
the electric
fuel
pump
and observing
fuel
pressure.
During
cruise,
the
electric fuel
pump
should
be
in the off
position
so that any
malfunction
of the engine
driven fuel
pump
is
immediately
apparent.
If signs of
fubl
starvation
should occur at
any
tirne
during flight,
fuel
exhaustion
should
be
suspected,
at which time the
fuel selector
should
be
immediately
positioned
to a
full
tank
and
the
electric
fuel
pump
switched
to
the
on
position,
When
the
seventh
seat is
used, all
weight
in
excess of 3l 12
pounds
must be
in
fuel
weight
only.
Fill
tip
tanks first
and use fuel from
main
tanks
first.
*Serial
nos. 7540001
and
up
OPERATING INSTRUCTIONS
REVISED:
JUNE
20.1974
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