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SECTION III
CHEROKEE
140 "D"
WARM-UP
As soon as the engine starts,
the oil
pressure
should
be
checked.
If
no
pressure is indicated
within
thirty
seconds,
stop
the engine
and
determine
the trouble.
In cold weather
it
will take a
few
seconds
longer
to
get
an oil
pressure indication.
Warm-up
the engine at 800 to 1200
RPM.
Take-off
may
be
made
as soon
as
ground
check
is
completed,
providing
that the throttle
may
be
opened
fully
without
back firing
or
skipping,
and without
reduction
in
engine oil
pressure.
GROUND
CHECK
Check the magnetos
at 2000 RPM
by
switching
from
Both to Right
then
back
to
Both
before
switching
to Left. Differential
drop
should
not exceed
50 RPM while the total
dräp
on either magneto
should not
exceed
175 RPM.
Check vacuum
gauge, indicator
should read
5"
Hg
±.1"
Hg at 2000
RPM.
Check
both
the oil temperature
and
pressure.
The temperature
may
be low for
some time
if
the engine
is being
run
for
the
first
of
the
day,
but
as
long
as the
pressure is
within
limits
the engine
is
ready
for
take-off.
Carburetor
heat
should
also
be
checked
prior
to take-off
to
be
sure
that the control
is
operating
properly
and to clear any
ice
which
may
have formed during
taxiing.
Avoid
prolonged ground
operation
with
carburetor
heat
ON as the air
is
unfiltered.
The electric
fuel
pump
should
be
turned
off momentarily
during
ground
check
to make
sure that the engine
driven pump is
operating.
The electric
fuel pump
should
be
on
during
take-off
to
prevent loss
of
power
should
the engine
driven pump fail.
The engine
is
warm enougu
for
take-off
when
the
throttle
can
be
opened
without
the engine
faltering.
TAKE-OFF
Just
before
take-off
the
following items
should
be
checked:
1.
Fuel on
proper
tank
2.
Electric
fuel pump
ON
16
730118
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