SECTION 7
AIRPLANE
&
SYSTt:MS DESCRIPTION
FUEL VENTING
,
-;;"1-
,
,CESSNA
MODEL 172S
Fuel system venting is essential to ,system operation,
Blockage'
'of the system will result in decreasing fuel flow and eventual engine
stoppage,
Venting is' accomplished
by an interconnecting :Iine from
the right fuel tank to the left ..tank. The. left, fuel tank is vented'
overboard through a vent line, equipped with a check valve, which
protrudes from the bottom surface of' the, left wing near the wing
strut. Both fuel filler caps are also vented..
'
REDUCED TANK CAPACITY
The airplane
may' be serviced to
a reduced
capacity
to permit
heavier cabin loadings. This is accomplished
by'filling
each tank to
the bottom .edge of the fuel filler tab, thus giving a reduced fuel load
of 17.5 gallons usable in each tank.
'
FUEL SELECTOR VALVE
.
"
-..
The fuel selector
valve
should
be' in 'the 'BOTH
position
for
takeoff, climb, landing, and maneuvers that involve prolonged slips
or skids of more than, 30 seconds. Operation from either
LEFT
or
RIGHT tank 'is reserved for cruising flight.
0'
'.'
."
J
.'
NOTE
~.
, When the fuel selector valve handle is.in the Bon-i
position,
in cruising
flight,
unequal
fuel flow from each tank may.
occur
if
the
wings
are
not. maintained
exactly
,level.
Resulting, wing, heaviness
can be: alleviated
graduaIlY,.by'
turning the selector valve handle to the tank in the "h,eavy".
wing:
It is not practical to measure the time required to'
consume all of the fuel in one tank, and, after switching to
the
opposite
tank,
expecf'
an ,equal' duration, .from' ,the
remaining
,fuel.
The
airspace
in', both
fuel
tanks'
is
interconnected
by a vent line and,' therefOre, some sloshing
of fuel between tanks can be expected when the tanks are'
nearly full and the wings are not level.
7-26
'July
8/98
Содержание Cessna 172S Skyhawk SP
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