SECTION
8
HANDLING,
SERVICE
&
MAINTENANCE
CESSNA
MODEL
172R
FUEL CONTAMINATION
Fuel
contamination
is usually
the
result of foreign
material
present
in
the
fuel
system,
and may consist of
water, rust,
sand, dirt,
-
microbes or bacterial
growth.
In
addition,
additives that are
not
compatible
with
fuel
or fuel
system
components
can
cause
the fuel
to
become contaminated.
Before
each
flight
and after each
refueling,
use a
clear
sampler
cup
and drain
at
least
a
cupful of fuel from each fuel tank drain
location
and
from
the
fuel strainer quick drain valve
to
determine
if
contaminants are
present,
and
to
ensure
the
airplane
has
been
fueled with the proper
grade of fuel.
|
If
contamination
is detected, drain
all
fuel drain points
again,
including
the
fuel
reservoir
and
fuel selector quick drain
valves
and
then gently rock the
wings
and lower the tail
to
the
ground to
move
any
additional contaminants to
the
sampling
points.
Take repeated
|samples
from
all
fuel
drain
points
until
all
contamination
has been
removed.
If,
after repeated
sampling,
evidence
of
contamination still
exists,
the airplane should
not
be flown. Tanks
should be
drained
and
system
purged by
qualified
maintenance
personnel. All
evidence
of
contamination
must
be removed
before further
flight. If
the
airplane has
been
serviced with
the
improper fuel
grade, defuel
completely
and
refuel
with
the
correct grade.
Do
not
fly
the
airplane
with
contaminated
or
unapproved fuel.
In addition, Owners/Operators
who
are
not acquainted
with a
particular fixed
base operator
should be assured that the fuel
supply
has been
checked
for
contamination and is properly filtered before
allowing
the
airplane
to
be serviced. Fuel tanks should be kept full
between
flights,
provided weight
and
balance considerations will
permit,
to
reduce the possibility of
water
condensing on
the walls of
partially filled
tanks.
To further reduce the possibility
of
contaminated
fuel,
routine
maintenance
of
the fuel
system
should be performed
in
accordance
with
the airplane
Maintenance Manual.
Only
the proper
fuel,
as
recommended in this
handbook,
should
be used,
and
fuel
additives
should
not
be used
unless approved
by
Cessna
and the Federal
Aviation Administration.
8-20
Revision 8
Summary of Contents for 172R
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