Open Door; Engine Roughness - Piper Cherokee Archer II Pilot Operating Handbook

PIPER AIRCRAFT CORPORATION
PA-28-181, CHEROKEE ARCHER
n
3.27 OPEN DOOR
SECTION 3
EMERGENCY PROCEDURES
(
The cabin door on the Cherokee is double latched, so the chances of its springing open in flight at
both the top and side are remote. However, should you forget the upper latch, or not fully' engage the sid~
latch, the door may spring partially open. This will usually happen at takeoff or soon afterward. A partially
open door will not affect normal flight characteristics, and a normal landing can be made with the door
open.
If both upper and side latches are open, the door will trail slightly open, and airspeed will be reduced
slightly.
To close the door in flight, slow the airplane to 87 KIAS, close the cabin vents and open the storm
window. If the top latch is open, latch it. If the side latch is open, pull on the armrest while moving the
latch handle to the latched posi tion. If both latches are open, close the side latch then the'top latch.
3.29 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.
Tum carburetor heat on (See Note). RPM wiJI decrease slightly and roughness wiJI increase. Wait for a
.decrease in engine roughness or an increase in RPM, indicating ice removal. If no change
in
approximately
one minute, return the carburetor heat to "OFF."
If the engine is still rough, adjust the mixture for maximum smoothness. The engine will run rough if
too rich or too lean. The electric fuel pump should be switched to "ON" and the fuel selector switched to
the other tank to see if fuel contamination is the problem. Check the engine gauges for abnormal readings.
If any gauge readings are abnormal, proceed accordingly. Move the magneto switch to
"L" then to "R,"
then back to "BOTH." If operation is satisfactory on either magneto, proceed on that magneto at reduced
power, with mixture full "RJCH," to a landing at the first available airport.
If roughness persists, prepare for a precautionary landing at pilot's discretion.
NOTE
,
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, therefore, always use full heat, and
when ice is removed return the control to the full cold position.
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ISSUED: JUNE 18, 1976
REVISED: FEBRUARY 25, 1977
REPORT: VB-790
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