Textron Cessna 172R User Manual

SECTION
3
EMERGENCY
PROCEDURES
CESSNA
MODEL
172R
ROUGH ENGINE OPERATION
OR
LOSS
OF
POWER
SPARK
PLUG FOULING
A
slight engine roughness
in
flight
may
be caused
by
one
or
more
spark
plugs becoming
fouled
by
carbon
or
lead
deposits.
This
may
be
verified
by turning
the
ignition
switch
momentarily
from
BOTH
to
either
L
or
R
position.
An
obvious
power
loss
in
single
ignition
operation
is evidence
of
spark
plug
or
magneto
trouble.
Assuming
that
spark
plugs
are
the
more
likely
cause,
lean the
mixture
to
the recommended lean
setting
for
cruising
flight.
If
the
problem
does
not
clear
up
in
several
minutes,
determine
if
a
richer
mixture
setting
will
produce
smoother
operation.
If
not,
proceed
to
the
nearest
airport
for
repairs
using
the
BOTH
position
of
the
ignition
switch unless
extreme
roughness
dictates
the
use
of
a
single
ignition
position.
MAGNETO
MALFUNCTION
A
sudden
engine
roughness
or
misfiring
is
usually
evidence
of
magneto
problems.
Switching
from
BOTH
to
either
L
or
R
ignition
switch
position
will
identify
which
magneto
is
malfunctioning.
Select
different
power
settings
and
enrichen the mixture
to
determine
if
Icontinued
operation
on
BOTH
magnetos
is
possible.
If
not,
switch
to
the
good
magneto
and
proceed
to
the
nearest
airport
for
repairs.
ENGINE-DRIVEN
FUEL
PUMP
FAILURE
Failure
of
the
engine-driven
fuel
pump
will
result
in
an
immediate
loss
of
engine
power,
similar
to
fuel
exhaustion
or
starvation,
but
while
operating
from
a
fuel
tank
containing
adequate
fuel.
A
sudden
reduction
in
indicated
fuel
flow
will
occur
just
before
loss
of
engine
power.
If
the
engine-driven
fuel
pump
fails,
immediately
set
the
auxiliary
fuel
pump
switch
(FUEL
PUMP)
to
the
ON
position
to restore
engine
power.
The
flight
should
be
terminated
as soon as
practical
and
the
engine-driven
fuel
pump
repaired.
3-20
Revision
7
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Textron Cessna 172R Specifications

General

Brand	Textron
Model	Cessna 172R
Category	Aircrafts
Language	English