SECTION 7
AIRPLANE
&
SYSTEMS
DESCRIPTION
CESSNA
MODEL 172R
IGNITION AND STARTER SYSTEM
|
Engine
ignition
is
provided by
two
engine-driven
magnetos,
and
two
spark plugs in each
cylinder.
The right
magneto
fires the lower
right and
upper
left
spark plugs, and the left
magneto
fires
the
lower
left and
upper right
spark plugs.
Normal
operation
is
conducted
with
|both
magnetos
due
to
the
more
complete burning of the
fuel/air
mixture with
dual ignition.
|
Ignition
and starter
operation is controlled
by
a
rotary-type
switch
located
on
the
left
switch and
control panel. The switch is labeled
clockwise,
OFF,
R,
L,
BOTH,
and
START.
The
engine
should be
operated
on
both
magnetos
(BOTH position) except for
magneto
checks. The R
and
L
positions are
for checking
purposes
and
emergency
use only.
When the
switch is rotated
to
the
spring
loaded
START
position,
(with
the
master
switch in the
ON position),
|the
starter contactor is
closed and the
starter,
now
energized,
will
crank the engine.
When the
switch is released,
it will automatically
return to
the
BOTH
position.
AIR
INDUCTION SYSTEM
The
engine air
induction
system
receives
ram
air
through an
intake on
the
lower front portion of the engine cowling. The intake is
covered by an air
filter which
removes
dust
and other
foreign
matter
from
the
induction air. Airflow
passing
through
the filter
enters
an
air
box. The air box
has a
spring-loaded alternate
air
door. If the air
induction filter should become
blocked,
suction
created by the
engine will
open
the door
and
draw
unfiltered air from inside the
lower
cowl
area.
An
open
alternate air door
will
result
in an
approximate
10%
power
loss
at
full
throttle.
After passing through
the air
box,
induction air
enters a fuel/air
control unit under the
engine,
and is then ducted
to
the
engine
cylinders
through
intake
manifold tubes.
7-22
Revision
4
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