Textron Cessna 172R - Page 291

CESSNA
MODEL
172R
SECTION
8
HANDLING,
SERVICE
&
MAINTENANCE
2.
An
alternate method that
may
be used is
to
premix
the
complete
alcohol
dosage
with
some
fuel
in
a
separate
clean
container
(approximately
2-3
gallon
capacity)
and
then
transferring
this mixture
to
the tank
prior
to
the
fuel
operation.
Diethylene glycol monomethyl
ether
(DiEGME)
compound
must
be
carefully
mixed
with
the
fuel
in
concentrations between
0.10%
-r
'
(minimum)
and
0
.15%
(maximum)
of
total
fuel
volume.
Refer
to
f
Figure
8-1
for
a
DiEGME-to-fuel
mixing
chart.
A
CAUTION
ANTI-ICING
ADDITIVE
IS
DANGEROUS
TO
I
HEALTH
WHEN BREATHED
AND/OR
ABSORBED
INTO
THE
SKIN.
A
CAUTION
MIXING OF DiEGME
WITH
FUEL
IS
EXTREMELY
I
IMPORTANT.
A
CONCENTRATION
IN
EXCESS
OF
THAT
RECOMMENDED
(0.15%
BY
VOLUME
MAXIMUM)
MAY
RESULT
IN
DETRIMENTAL
EFFECTS
TO
THE
FUEL
TANK
SEALANT,
AND
DAMAGE
TO
O-RINGS
AND
SEALS
USED
IN
THE
FUEL
SYSTEM
AND
ENGINE
COMPONENTS.
A
_
CONCENTRATION
OF
LESS
THAN
THAT
|
RECOMMENDED
(0.10%
BY
TOTAL
VOLUME
MINIMUM)
WILL
RESULT
IN
INEFFECTIVE
TREATMENT.
USE
ONLY BLENDING
EQUIPMENT
THAT
IS
RECOMMENDED
BY THE
MANUFACTURER
TO
OBTAIN
PROPER
PROPORTIONING.
Prolonged
storage
of
the
airplane
will
result
in
a
water
buildup
in
the
fuel
which "leeches
out"
the
additive.
An
indication
of
this is
when
an
excessive
amount
of
water
accumulates
in
the
fuel
tank
sumps.
The concentration
can
be
checked
using
a
differential
smm,
refractometer.
It
is
imperative
that
the
technical
manual
for
the
(
differential
refractometer
be
followed
explicitly
when
checking
the
additive
concentration.
Feb
28/00
8-19
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