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CESSNA
MODEL
172N
ELECTRICAL SYSTEM
The airplane
is
equipped
with a
p8-volt,
system
(see
figure
7-7).
"fhe
system is
powered
1
July
1979
SECTION
7
AIRPLANE & SYSTEMS DESCRIPTIONS
direct-current electrical
by
a
belt-driven,
60-amp
7-23
all of
the fuel
in
one
tank,
and,
after switching to
the
opposite tank, expect
an
equal duration from theiemain_
ing fuel.
The airspace
in
both
fuel tanks is interconnected
by
a
vent
line
and,
therefore,
some
sloshing
of
fuel
between
tanks
can
be
expected
when the tanks
are
nearly
full
and
the wings
are
not level.
The
fuel
system
is
equipped
with
drain valves to provide
a
means
for
the examination of fuel
in
the system for contamirratio,
and grade. The
system should
be
examined
before
the
first flight
of every day
and
after
each
refueling, by using the sampler
cup
provided to drain
full
from
the
wing tank
sumps,
and
by
utilizing
the fuef strainer drain
under
an access
panel
on the
right
side
of
the
engine
cowling.
The
fuel
tanks
should
be
filled
after
each
flight
to prevent
condensation.
BRAKE SYSTEM
The
airplane has
a
single-disc, hydraulically-actuated brake
on each
main landing
gear wheel. Each brake
is
connected, by
a
hydrauric
rine, to
a
master
cylinder
attached
to
each of
the
pilot's
rudder
peaut=. The
brakes
are-
operated
by applying pressure to the top of either
the
left (pilot,s) or
right
(copilot's)
set
of rudder
pedals,
which
ire
interconnected. when the
airplane is parked, both main wheel brakes may
be set
by
utilizing
the
parking brake which
is
operated
by
a handle under the
ieft
side
o1
the
instrument panel. To apply the parking brake,
set
the brakes
with
the
rudder
pedals,
pull
the handle aft,
and
rotate
it
g0o
down.
For maximum brake
rife,
keep
the brake system
properly maintained,
and
minimize brake
usage
during
taxi
operatiorrs
and
ianaings.
,
Some
of the
symptoms
of
impending brake failure are:
gradual
decrease
in
braking action after brake application, noisy or dragging
brakes, soft
or
spongy pedals, and excesiive travel
and
"weak
urar<in[
action'
If
any of these symptoms appear, the brake system is in
need of
immediate attention.
If,
during
taxi
or Ianding rotl,
traking
action
de-
creases,
let up
on the pedals and then re-apply the brakes
with
heavy
pressure.
If
the
brakes
become
spongy
or pedal
travel
increases,
pumplng
the pedals should build braking pressure.
If
one
brake
becomes
weak or
fails,
use
the other
brake
sparingly while using
opposite rudder,
as
required, to offset the
good brake.
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