Piper ARCHER III Pilot Operating Handbook page 102

SECTION
3
EMERGENCY PROCEDURES PA.28.181.
ARCHER
III
3.5j
Engine Roughness
Engine roughness
may be
caused
by
blockage
in
the
injector
nozzles,
induction
system
icing,
or
ignition
problems.
Adjust
the
mixture
for
maximum
smoothness.
The
engine
will
run
rough
if
the
mixture
is too
rich
or too lean.
Move
the alternate
air to OPEN
and then
turn
ON
the
electric fuel pump. Switch
the
fuel
selector
to another
tank to
see
if
fuel
contamination is the
problem.
Check the engine gauges
for
abnormal readings.
If
any gauge readings
are
abnormal
proceed accordingly.
REPORT:
YB-2749
3-40
Engine
Roughness
ALTERNATE
AIR
OPEN
If
roughness continues
after
one
minute;
MIXTURE..
Adjust fbr Maximum
Smoothness
ALTERNATE
AIR.............
CLOSE
FUEL
PUMP
Fuel
Selector
.........oN
................
SWITCH TANKS
Engine Indicators
CHECK
LEFT/RIGHT
MAG
Switches
Individually
Select
OFF
and
ON
If
operation is satisfactory on either
MAG,
continue on that magneto
at
reduced
power
and
full
RICH mixture to
nearest
airport.
Prepare
for
power-off
lnnd.ing.
rTOTil
If
possible, always
retain
glide
capability
to
the
selected
landing
area
in
case
oftotal
engine
failure.
ISSUED: December 22,
2017