CESSNA SECTION 8
MODEL 208B 867 SHP AIRPLANE HANDLING, SERVICE
GARMIN G1000 AND MAINTENANCE
U.S.
CLEANING AND CARE (Continued)
ENGINE (Continued)
ENGINE COMPRESSOR WASH
(Continued)
Operating environment determines the nature of the wash, the
frequency, and wash method recommended. If operating in a
continuously salt-laden environment, a desalination wash is
recommended following the last flight of the day by means of the
motoring method. Occasionally, salt-laden environments may
necessitate a desalination wash each week using the motoring method.
Less severe and more general operating environments are not as
conducive to rapid deposit buildup but eventually can contribute to
performance deterioration and necessitate a performance recovery
wash at intervals of 100-200 hours. In these general environments, a
motoring wash is recommended for light soil and multiple motoring or a
running wash is suggested for heavy soil.
Observe engine starting cycle limits when conducting
motoring wash procedures. Refer to Section 2,
Limitations, Powerplant Limitations, for details on
Engine Starting Cycle limits.
A number of cleaning agents are recommended for addition to water to
form the cleaning solution used for compressor wash. However, the
mixture proportion of all the cleaning agents is not identical. Depending
on the prevalent ambient temperature, aviation kerosene and methanol
must be added to the cleaning solution in various proportions. The
quality of the water used is also important; any drinking quality water is
permissible for a motoring wash, but demineralized water only is
recommended for a running wash. Detailed information concerning the
cleaning mixture components, mixture formulation, recommended
quantity and application equipment can be found in Pratt & Whitney
Aircraft Gas Turbine Operation Information Letter No. 7.
208BPHCUS-00 8-53
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