Cessna T182 1982 Pilot Operating Handbook page 185

CESSNA
SECTION 8
MODEL T182 HANDLING, SERVICE
&
MAINTENANCE
ticed in the operation of the engine.
One exception to this can be encountered when operating under the
combined effect of: (1) use of certain fuels, with (2) high humidity
conditions on the ground (3) followed by flight at high altitude and low
temperature. Under these unusual conditions, small amounts of water
in solution can precipitate from the fuel stream and freeze in sufficient
quantities to induce partial icing of the engine fuel system.
While these conditions are quite rare and will not normally pose a
problem to owners and operators, they do exist in certain areas of the
world and consequently must be dealt with, when encountered.
Therefore, to alleviate the possibility of fuel icing occurring under
these unusual conditions, it is permissible to add isopropyl alcohol or
ethylene glycol mono methyl ether (EGME) compound to the fuel
supply.
The introduction of alcohol or EGME compound into the fuel provides
two distinct effects: (1) it absorbs the dissolved water from the gasoline
and (2) alcohol has a freezing temperature depressant effect.
Alcohol, if used, is to be blended with the fuel in a concentration of 1%
by volume. Concentrations greater than 1% are not recommended
since they can be detrimental to fuel tank materials.
The manner in which the alcohol is added to the fuel is significant
because alcohol is most effective when it is completely dissolved in the
fuel. To ensure proper mixing, the following is recommended:
1. For best results, the alcohol should be added during the fueling
operation by pouring the alcohol directly on the fuel stream
issuing from the fueling nozzle.
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.
Any high quality isopropyl alcohol may be used, such as Anti-Icing
Fluid (MIL-F-5566) or Isopropyl Alcohol (Federal Specification TT-I­
735a). Figure 8-1 provides alcohol-fuel mixing ratio information.
(
Ethylene glycol monomethyl ether (EGME) compound, in compliance
with MIL-I-27686 or Phillips PFA-55MB, if used, must be carefully
mixed with the fuel in concentrations not to exceed .15% by volume.
Figure 8-1 provides EGME-fuel mixing ratio information.
21 August 1981
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