Cessna 182 1973 - Taxiing; Warm-Up; Magneto Check

If the
engine
is
underprimed
(most likely
in
cold
weather
with
a
cold
engine)
it will not
fire
at
all.
Additional
priming
will
be
necessary
for
the next
starting
attempt.
As
soon
as
the
cylinders
begin
to
fire,
open
the
throttle
slightly
to
keep
it
running.
If
prolonged
cranking
is
necessary,
allow the
starter
motor
to
cool
at
frequent
intervals,
since
excessive
heat
may
damage
the
armature.
TAXIING.
The
carburetor
heat
knob
should be
pushed
full
in
during
all
ground
operations
unless heat
is
absolutely
necessary
for
smooth
engine operation.
When
the
knob
is
pulled
out
to
the heat
position,
air
entering
the
engine
is
not
filtered.
Taxiing over
loose
gravel
or
cinders
should
be
done
at
low
engine
speed
to
avoid
abrasion
and
stone
damage
to the
propeller
tips.
Refer
to
figure
2-4
for additional
taxiing
instructions.
BEFORE
TAKE-OFF.
WARM-UP.
Since
the
engine
is
closely
cowled
for
efficient
in-flight
cooling,
pre-
cautions should
be taken to avoid
overheating
on
the
ground.
Full
throttle
checks
on
the
ground
are
not
recommended
unless
the
pilot
has
good
reason
to
suspect
that
the
engine
is
not
turning
up
properly.
MAGNETO
CHECK.
The
magneto
check
should be
made
at
1700
RPM
as
follows.
Move
ignition
switch
first
to
"R'"
position,
and
note
RPM.
Next
move
switch
back to
"BOTH"
to
clear
the
other set
of
plugs.
Then
move
switch to
"L"
position,
note
RPM
and
return
the
switch
to the
"BOTH"
position.
RPM
drop
should not exceed
150
RPM
on
either
magneto
or
show
greater
than
50
RPM
differential
between
magnetos.
If
there is
a
doubt
concerning
operation
of
the
ignition
system,
RPM checks
at
higher
engine
speeds
will
usually
confirm whether
a
deficiency
exists.
An
absence
of
RPM
drop
may
be
an
indication
of
faulty grounding
of
one
side
of
the
ignition
system or
should be
cause
for
suspicion
that the
magneto timing
is
set
in
advance
of
the
setting
specified.
2-10