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CESSNA
MODEL
182S
BEFORE TAKEOFF
WARM
UP
SECTION 4
NORMAL PROCEDURES
¡
I
lf
the
engine idles (approximately
650
RPM)
and
accelerates
'smoothly, the airplane
is
ready
for
takeoff. Since
the
engine
is
closely cowled
for efficient
in-flight cooling, precautions should
be
taken
to
avoid overheating during prolonged engine operation
on
the
ground.
Also, long periods
of
idling may cause fouled
spark
plugs.
MAGNETO CHECK
The
magneto check should
be
made
at
1800 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 the 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.
lf
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.
ALTERNATOR
CHECK
Prior
to
flights where verification
of
proper alternator
and
allernator control
unit
operation
is
essential (such
as
night
or
instrument flights),
a
positive verification can
be made by
loading
the electrical system momentarily (3 to 5
seconds)
with the
landing
light
or by
operating the wing flaps during the engine runup
(1800
RPM). The ammeter
will
remain within
a
needle width
of its
initial
reading
if
the
alternator and alternator control unit
are
operating
properly.
Nov
1/01
4-23
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