Textron Cessna 172R User Manual

CESSNA
MODEL
172R
SECTION
4
NORMAL
PROCEDURES
BEFORE TAKEOFF
WARM
UP
If
the
engine
idles
(approximately
600
RPM)
and
accelerates
smoothly,
the
airplane
is
ready
for takeoff.
Since
the
engine
is
closely
cowled
for
efficient
in-flight
engine 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.
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.
ALTERNATOR
CHECK
Prior
to
flights
where
verification
of
proper
alternator
and
alternator
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.
Revision
7
4-23
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Textron Cessna 172R Specifications

General

Brand	Textron
Model	Cessna 172R
Category	Aircrafts
Language	English