Aircraft Systems • 1
SECTION 1
Aircraft Systems
Engine
The Archer is equipped with a Lycoming, 4-cylinder, O-360 (opposed, 360 cubic
inch) engine rated at 180 horsepower at 2700 RPM. The engine is direct drive
(crankshaft connected directly to the propeller), horizontally opposed (pistons
oppose each other), piston driven, carbureted and normally aspirated (no turbo
or supercharging). Engine ignition is provided through the use of two engine-
driven magnetos, which are independent of the aircraft's electrical system and
each other.
L Lycoming
H Horizontally Opposed
A Air Cooled
N Normally Aspirated
D Direct Drive
Carburetor Icing
Under certain atmospheric conditions at temperatures of 20° to 70° F
(-5° to 20° C), it is possible for ice to form in the induction system, even in
summer weather. This is due to the high air velocity through the carburetor
venturi and the absorption of heat from this air by vaporization of the fuel. To
avoid this, carburetor heat is provided to replace the heat lost by vaporization.
The initial signs of carburetor ice can include engine roughness and a drop in
RPM. Carburetor heat should be selected on full if carburetor ice is encountered.
Adjust mixture for maximum smoothness.
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. Therefore when using
carburetor heat, always use full heat and when the ice is removed, return the
control to the full cold position.
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