SECTION 7
AIRPLANE & SYSTEMS DESCRIPTIONS
CESSNA
MODEL 172N
mounted on the bottom of the engine. The carburetor is equipped with an
enclosed accelerator pump, an idle cut-off mechanism, and a manual
mixture control. Fuel is delivered to the carburetor by gravity flow from
the fuel system. In the carburetor, fuel is atomized, proportionally mixed
with intake air, and delivered to the cylinders through intake manifold
tubes. The proportion of atomized fuel to air may be controlled, within
limits, by the mixture control on the instrument panel.
For easy starting in cold weather, the engine is equipped with a
manual primer. The primer is actually a small pump which draws fuel
from the fuel strainer when the plunger is pulled out, and injects it into the
cylinder intake ports when the plunger is pushed back in. The plunger is
equipped with a lock and, after being pushed full in, must be rotated either
left or right until the knob cannot be pulled out.
COOLING SYSTEM
Ram air for engine cooling enters through two intake openings in the
front of the engine cowling. The cooling air is directed around the cylinders
and other areas of the engine by baffling, and is then exhausted through an
opening at the bottom aft edge of the cowling. No manual cooling system
control is provided.
A winterization kit is available for the airplane. Details of this kit are
presented in Section 9, Supplements.
PROPELLER
The airplane is equipped with a two-bladed, fixed-pitch, one-piece
forged aluminum alloy propeller which is anodized to retard corrosion.
The propeller is 75 inches in diameter.
FUEL SYSTEM
The airplane may be equipped with either a standard fuel system or
long range system (see figure 7-6). Both systems consist of two vented fuel
tanks (one in each wing}, a four-position selector valve, fuel strainer,
manual primer, and carburetor. Ref er to figure 7-5 for fuel quantity data for
both systems.
Fuel flows by gravity from the two wing tanks to a four-position
selector valve, labeled BOTH, RIGHT, LEFT. and OFF. With the selector
valve in either the BOTH, LEFT, or RIGHT position, fuel flows through a
strainer to the carburetor. From the carburetor, mixed fuel and air flows to
the cylinders through intake manifold tubes. The manual primer draws its
7-20
1 July 1979
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