Textron Cessna 172R - Fuel Contamination

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
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