Specifications

CHEROKEE SD(.300
WARM-UP
Warm-up the
engine at
1000
to 1200
RPM. Avoid
prolonged
idling
at
low RPM,
as
this
practice
may result
in
fouled spark
plugs.
Takeoff
may be
made as
soon as the
ground
check is
completed,
provided
that
the
throttle
may
be
opened
fully without
backfiring
or
skipping,
and
without
a reduction in
engine
oil
pressure.
Do
not operate
the
engine at high
RPM when running up or
taxiing over
ground
containing
loose stones,
gravel
or
any
loose material
that
may cause
damage
to
the
propeller
blades.
GROUND
CHECK
The
magnetos should be checked
at 2000 RPM with the
propeller
set at high
RPM. Drop
off
on
either magneto
should
not
exceed
175
RPM and the difference between
the
magnetos
should not exceed 50 RPM. Operation
on one
magneto should
not
exceed l0
seconds.
.
Check
the
vacuum
gauge;the
indicator should
read 5.0"
+
.1" Hg
at 2000
RPM.
;
i
Check
both
oil temperature and oil
pressure.
The temperature may
be low
for
some
time if
the
engine is
being
run for the first
time
of the day,
but as
long
as
the
pressure
is within
limits
the engine is ready
for
takeoff.
Check
the
annunciator
panel
lights
with
the
pressto-test
buttonr.
The
propeller
control sttould
be moved
through
its
complete
range to
check
for
proper
operation, and then
placed
in full INCREASE
RPM
for takeoff. To
obtain
maximum
RPM,
push
the
pedestal
mounted
control fully
forward on the instrument
panel.
Do
not
allow
a drop of
more
than 500 RPM during this check.
In
cold
weather the
propeller
control
should be
cycled
from
higlr to low RPM
at
least
three times
before
takeoff
to
make sure
that
warm engine
oil
has
circulated.
The
electric fuel
pump
should be turned
off
after
starting
or
during
warm-up to
make
sure
that the engine
driven
pump
is operating. Prior to
takeoff the
electric
pump
should be turned
ON
again
to
prevent
loss of
power
during
takeoff
should
the engine
driven
pump
fail.
The
engine
is
warm
enough for takeoff
when the throttle
can be
opened
without the engine
faltering.
rSerial
nos. 7540001
and
up
OPERATING
INSTRUCTIONS
REVISED:
JUNE
20,1974
74