CHEROKEE
180
SECTION
IV
1.
Reduce electrical load.
2.
Alternator circuit
breakers
-
Check
3.
"Alt"
switch
-
Off (for
30
seconds),
Then On.
If the
ammeter continues to indicate no
output,
or alternator
will
not
stay
reset,
turn
off
"Alt" switch, maintain
minimum electrical
load
and
land as
soon
as
practical. All electrical
load is
being
supplied by the
battery.
ENGINE
ROUGHNESS
Engine roughness
is
usually
due to carburetor icing which
is
indicated
by
a drop in
RPM, and may
be
accompanied by
a slight
loss
of airspeed
or altitude. If too much
ice is allowed to
accumulate,
restoration of full power
may
not be
possible,
therefore,
prompt
action
is required.
1.
Carburetor
heat-on
(See
Note).
RPM will decrease slightly
and
roughness
will increase.
Wait for
a
decrease
in
engine
roughness
or
an
increase in RPM,
indicating
ice
removal. If
no
change in
approximately
one
minute,
return
carburetor heat to COLD. If the engine is
still
rough,
try
steps below.
a.
Mixture
-
Adjust for maximum
smoothness.
Engine
will
run rough if
too
rich or
too lean.
b.
Electric
Fuel Pump
-
On
c.
Fuel Selector
-
Change to
other
tank to
see if
fuel
contamination
is
the problem.
d. Engine Gauges
-
Check
for abnormal readings.
If
any
gauge
readings are
abnormal,
proceed
accordingly.
e. Magneto
Switch
-
"L" then
"R",
then back to
"BOTH".
If
operation
is
satisfactory on either magneto, proceed
on
that
magneto
at
reduced
power, with mixture full
rich, to
a
landing at
the
first
available
airport.
If
roughness
persists, prepare
for
a
precautionary
landing
at
pilots
discretion.
761 513
39
720615
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