Piper ARCHER III Pilot Operating Handbook page 314

SECTION 9
SUPPLEMENT 6
3.5 El\ilERGENCY PROCEDURES CHECK LIST (continued)
3.Sk Engine Roughness
Partial carburetor heat may be worse than no heat
at all, since it may melt part of the ice, which
will refreeze in the intake system. When using
carburetor heat, always use full ON, and when
ice is removed return the control to the full OFF
position.
CARE HEAT ......................................................................................... ON
If roughness continues after one minute:
CARB HEAT ....................................................................................... OFF
MIXTURE ............................................. Adjust for Maximum Smoothness
FUEL PUMP .......................................................................................... ON
Fuel Selector .................................................................. SWITCH TANKS
Engine Indicators ........................................................................... CHECK
LEFr/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 landing.
If possible, always retain glide capability to the
selected landing area in case of total engine failure.
Engine roughness due to carburetor icing is indicated by a drop in
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. Upon completion of this checklist, if
roughness persists, prepare for a precautionary landing at pilot's discretion.
REPORT: VB-2749
9-36, 6 of 22
ENGINE ROUGHNESS
NOTE
NOTE
PA-28-181, ARCHER III
ISSUED: December 22, 2017
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RPM,
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