Early Model Systems Differences • 9
External Lighting
A single or dual landing/taxi light configuration is located at the front of the
engine cowl.
Carburetor Heat
Under certain moist 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, the 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 engine RPM. Operated by the knob next to the throttle control,
carburetor heat should be selected on if carburetor ice is expected or
encountered. Adjust mixture for maximum smoothness.