Textron Cessna Grand Caravan Ex 208B Pilot's Operating Handbook And Faa Approved Airplane Flight Manual page 262

SECTION 4
NORMAL PROCEDURES
PREFLIGHT INSPECTION
Outside storage for long periods may result in dust and dirt
accumulation in the engine air inlet and exhaust areas, water and
obstructions in airspeed system lines, water contaminants in fuel tanks,
and insect/bird/rodent nests in any opening. If any water is detected in
the fuel system, the inboard fuel tank sump and external sump quick-
drain valves and fuel reservoir quick-drain valve should all be
thoroughly drained until there is no evidence of water or sediment
contamination. If the airplane is parked with one wing low on a sloping
ramp, draining of the outboard fuel tank sump quick-drain valves (if
installed) is also recommended. Repeated samples should then be
taken at all quick drain points until all contamination has been
removed. If, after repeated sampling, evidence of contamination still
exists, the fuel tanks should be completely drained and the fuel system
cleaned.
If any water is suspected in the static source system, open both static
source drain valves and thoroughly drain all water from the system.
If the static source drain valves are opened, assure
both valves are completely closed before flight.
If the airplane has been stored outside in windy or gusty areas, or tied
down adjacent to taxiing airplanes, special attention should be paid to
control surface stops, hinges, and brackets to detect the presence of
potential wind damage.
If the airplane has been operated from unimproved runways, muddy
fields or in snow or slush, check the propeller for nicks and stone
damage. Operation from a gravel or cinder field will require extra
attention to propeller tips and abrasion on leading edges of the
horizontal tail. Stone damage to the propeller can seriously reduce the
fatigue life of the blades.
4-44
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WARNING
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U.S.
CESSNA
MODEL 208B 867 SHP
GARMIN G1000
FAA APPROVED
208BPHCUS-00