Textron Cessna C172S PIM, Руководство по эксплуатации для пилотов

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SECTION 8 CESSNA
AIRPLANE HANDLING, SERVICE MODEL 172S NAV III
AND MAINTENANCE GFC 700 AFCS
U.S.
FUEL
(Continued)
FUEL CONTAMINATION
Fuel contamination is usually the result of foreign material present in
the fuel system, and may consist of water, rust, sand, dirt, microbes or
bacterial growth. In addition, additives that are not compatible with fuel
or fuel system components can cause the fuel to become
contaminated.
Before each flight and after each refueling, use a clear sampler cup and
drain at least a cupful of fuel from each fuel tank drain location and from
the fuel strainer quick drain valve to determine if contaminants are
present, and to ensure the airplane has been fueled with the proper
grade of fuel.
If contamination is detected, drain all fuel drain points again, including
the fuel reservoir tank and fuel selector drain valves, and then gently
rock the wings and lower the tail to the ground to move any additional
contaminants to the sampling points. Take repeated samples from all
fuel drain points until all contamination has been removed. If, after
repeated sampling, evidence of contamination still exists, the airplane
should not be flown. Tanks should be drained and system purged by
qualified maintenance personnel. All evidence of contamination must
be removed before further flight. If the airplane has been serviced with
the improper fuel grade, defuel completely and refuel with the correct
grade. Do not fly the airplane with contaminated or unapproved fuel.
In addition, Owners/Operators who are not acquainted with a particular
fixed base operator should be assured that the fuel supply has been
checked for contamination and is properly filtered before allowing the
airplane to be serviced. Fuel tanks should be kept full between flights,
provided weight and balance considerations will permit, to reduce the
possibility of water condensing on the walls of partially filled tanks.
To further reduce the possibility of contaminated fuel, routine
maintenance of the fuel system should be performed in accordance
with the airplane Maintenance Manual. Only the proper fuel, as
recommended in this POH, should be used, and fuel additives should
not be used unless approved by Cessna and the Federal Aviation
Administration.
172SPHBUS-00
8-20