Cessna 182 1973 - Engine Power Loss and Roughness

light
will
illuminate
if the
charge voltage
reaches
approximately
16
volts.
Assuming
that
the malfunction
was
only
momentary, an
attempt
should be
made to
reactivate
the
alternator
system.
To
do
this,
turn
both
sides
of
the
master
switch
off and
then
on
again,
If
the
problem
no
longer
exists,
normal
alternator
charging
will
resume
and
the
warning light
will
go
off,
If
the
light
comes
on again,
a
malfunction
is
confirmed. In
this
event,
the
flight
should
be
terminated
and/or
the
current drain
on
the
battery
minimized because the
battery
can
supply
the
electrical
system
for
only
a
limited
period
of
time.
If
the
emergency
occurs-at
night,
power
must
be
conserved for
later
use
of
the
landing
lights
and
flaps
during
landing.
INSUFFICIENT RATE
OF CHARGE.
If
the
ammeter indicates
a
continuous
discharge
rate
in
flight,
the
alternator
is
not
supplying
power
to
the
system
and
should
be
shut
down
since
the
alternator
field
circuit
may
be
placing
an
unnecessary
load
on
the
system.
All
non-essential
equipment
should
be
turned "OFF" and the
flight
terminated
as
soon as
practical.
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
the
"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
normal
lean
setting
for
cruising
flight.
If
the
problem
does
not
clear
up
in
sev-
eral
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
extent
roughness
dictates
the
use
of
a
single-ignition
position,
MAGNETO MALFUNCTION.
A
sudden
engine
roughness
or
misfiring
is
usually
evidence
of
mag-
neto
problems.
Switching
from
"BOTH"
to
either
the
"L'
or
"R"
ignition
switch
position
will
identify
which
magneto
is
malfunctioning.
Select
different
power
settings
and
enrichen the
mixture
to
determine
if contin-
ued
operation
on
"BOTH"
magnetos
is
practicable.
If
not,
switch to
the
good
magneto
and
proceed
to the
nearest
airport
for
repairs.
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