CESSNA
MODEL
172R
SECTION 7
AIRPLANE
&
SYSTEMS
DESCRIPTION
BRAKE SYSTEM
The airplane has a single-disc, hydraulically
actuated
brake
on|
each
main
landing
gear
wheel. Each
brake
is
connected,
by a
hydraulic
line,
to
a
master
cylinder
attached
to
each
of
the pilot's
rudder pedals. 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
are
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 left side of the instrument panel. To
apply the
parking
brake, set
the brakes with the rudder
pedals,
pull
the handle
aft,
and
rotate it 90°
down.
For maximum brake
life,
keep
the
brake
system
properly
maintained,
and
minimize
brake usage
during
taxi operations and
landings.
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 excessive travel
and weak
braking action. If
any
of
these
symptoms
appear, the brake
system
is in
need
of
immediate attention.
If,
during taxi or
landing
roll,
braking
action
decreases,
let up
on
the
pedals
and then
reapply
the
brakes
with
heavy pressure.
If the brakes become spongy or pedal
travel
increases, pumping
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.
ELECTRICAL SYSTEM
The airplane
is equipped with a
28-volt,
direct
current
electrical
(
system
(Refer
to
Figure 7-7). The
system
is
powered
by a
belt-j
driven, 60-amp
alternator and
a 24-volt
battery, located
on
the
left
forward
side of the
firewall.
Power is supplied
to
most general
electrical
circuits through
a
split primary bus bar, with an
essential
bus wired between the
two
primaries
to
provide
power
for
the.
master
switch,
annunciator circuits and
interior lighting.
I
i
f!3*IN
Each primary
bus
bar is also connected
to
an
avionics
bus bar
via
a single
avionics
master
switch.
The
primary buses are
on|
anytime
the master switch
is turned
on,
and
are
not
affected by
starter
or external power usage. The avionics buses are on when
the
master
switch
and
avionics
master
switch
are in
the
ON
position.
Feb
28/00
7-29
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