SECTION
8
CESSNA
HANDLING, SERVICE, AND
MAINTENANCEMODEL 2088 (675 SHP)
ENGINE
CARE
(Continued)
ENGINE COMPRESSOR WASH
(Continued)
CAUTION
ALWAYS OBSERVE ENGINE STARTING CYCLE LIMITS
WHEN CONDUCTING MOTORING WASH
PROCEDURES.
A number of cleaning agents are recommended for addition to water to
form the cleaning solution used for compressor wash. The mixture
proportion of all the cleaning agents is not identical, however.
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
drinkina
aualitv water is oermissible for a motorina wash. but
demin&alized water only is recommended for a running wash. ~eiailed
nformarion concernina the cleanina mixture comoonents, mixture
formulation,
recommefded quantity a)ld application equipment can be
found in Pratt
&
Whitney Aircraft Gas Turbine Operation Information
Letter No. 7.
COMPRESSOR TURBINE BLADE WASH
Pratt
&
Whitney Canada Inc. has developed a procedure for performing
a comoressor turbine blade motorina wash. This technioue will facilitate
the removal of contaminants from
&e compressor turbine blade airfoil
surfaces, thereby minimizing sulphidation attack of these surfaces. This
serves as an aid for obtaining optimum blade
service life. With this
method, a water or waterlmethanol solution is injected directly into the
combustion chamber by way of a special spray tube which is installed
in one of the igniter plug ports. This method of engine wash does not
replace the need for a normal engine compressor wash for
performance recovery or desalination purposes.
Compressor turbine blade washing is accomplished using water of
drinking quality (potable) only at ambient temperatures of
+2"C (36°F)
and above. Use a waterlmethanol solution at ambient temperatures
below
+2"C (36
OF).
Consult the Engine Maintenance Manual for
solution strength according to ambient temperature and review Special
Instruction P
&
WC:
4-84
for washing procedures and limitations.
(Continued Next Page)
Revision
23
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