Cessna 172R Pilot Operating Handbook page 228

HANDLING, SERVICE & MAINTENANCE
MODEL 172R
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%
(minimum) and 0 .15% (maximum) of total fuel volume.
Refer to
Figure 8-1 for a DiEGME-to-fuel mixing chart.
A
CAUTION
ANTI-ICING IS DANGEROUS TO HEALTH WHEN
BREATHED AND/OR ABSORBED INTO THE
SKIN.
A
CAUTION
MIXING OF DIEGME WITH FUEL IS EXTREMELY
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 0-RINGS AND SEALS USED IN THE
FUEL SYSTEM AND ENGINE COMPONENTS. A
CONCENRATION
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
refractometer.
It
is imperative that the technical manual for the
differential refractometer be followed explicitly when checking the
additive concentration.
8-18
Feb 28/97
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SECTION 8
CESSNA