Drain Valves - Textron Cessna Grand Caravan Ex 208B Pilot's Operating Handbook And Faa Approved Airplane Flight Manual

SECTION 7
AIRPLANE AND SYSTEMS DESCRIPTION

DRAIN VALVES

The fuel system is equipped with drain valves to provide a means for
the examination of fuel in the system for contamination and grade.
Drain valves are located on the lower surface of each wing at the
inboard end of the fuel tank, in fuel tank external sumps, on the left side
of the cargo pod for the reservoir tank, and on the underside of the fuel
filter. Outboard fuel tank drain valves and their use is recommended if
the airplane is parked with one wing low on a sloping ramp. The drain
valves for the wing tanks and their external sumps are tool-operated
poppet type and are flush-external mounted. The wing tank and
external sump drain valves are constructed so that the phillips
screwdriver on the fuel sampler which is provided can be utilized to
depress the valve and then twist to lock the drain valve in the open
position. The drain valve for the reservoir is controlled by a double-
button push-pull drain control knob. When pulled out, fuel from the
reservoir drains out the rear fuel drain pipe located adjacent to the drain
valve. The drain valve for the fuel filter consists of a drain pipe which
can be depressed upward to drain fuel from the filter. The fuel sampler
can be used in conjunction with these drain valves for fuel sampling
and purging of the fuel system. The fuel tanks should be filled after
each flight when practical to minimize condensation.
Before each flight of the day and after each refueling, use a clear
sampler and drain fuel from the inboard fuel tank sump, external sump
quick-drain valves, fuel reservoir quick-drain valve, and fuel filter quick-
drain valve to determine if contaminants are present, and that the
airplane has been fueled with the proper fuel. If the airplane is parked
with one wing low on a sloping ramp, draining of the outboard fuel tank
sump quick-drain valves is also recommended. If contamination is
detected, drain all fuel drain points again. Take repeated samples from
all fuel 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. Do not fly
the airplane with contaminated or unapproved fuel.
JP-4 and other NAPHTHA based fuels can cause
severe skin and eye irritation.
7-86
U.S.
WARNING
CESSNA
MODEL 208B 867 SHP
GARMIN G1000
208BPHCUS-00