Cessna 172P - Page 145

CESSNA
MODEL
172P
SECTION
7
AIRPLANE &
SYSTEMS
DESCR,IPTIONS
FUEL
OUANTITY DATA
(U,S.
GALLONS}
FUEL TANKS
FUEL
LEVEL
(OUANTITY
EACH
TANK}
TOTAL
FUEL
TOTAL
UNUSABLE
TOTAL
USABLE
ALL FLIGHT
CONDITIONS
STANDARD
FU LL
(21.5)
43 3 40
LONG
RANGE
FULL
l27t
54
4
50
LONG RANGE
(INTEGRAL
TANKS)
FU
LL
(34)
68
6
62
LONG
RANGE
(INTEGRAL
TANKS}
REDUCED
l24l
48
6
42
Figure
7-õ.
FueI
Quantity
Data
fuel
from
the fuel strainer
and
injects
it into the
cylinder intake
ports.
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
line 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
nearthe wing
strut.
The right
fuel tank fitler
cap is
also
vented.
When
long ra,nge integral tanks
are installed,
the
airplane
may
be
serviced to a reduced capacity to
permit
heavier
oa,bin
loadings. This is
accomplished by filling
each
tank to
the bottom
edge
of
the
fuel
filler
collar,
thus
giving
a reduced fuel load
of
24
gallons
in each tank
(21
gallons
usa,ble in all flight conditions).
Fuel
quantity
is measured
by two float-type fuel
quantity
transmitters
(one
in each tank) and
indicated
by
two electrically-operated
fuel
quantity
indioators on the left
side of the instrument
penel.
An empty tank is
indicated by
a
red line and
the
letter
E. When
an
indicator
shows an empty
tank,
approximately
1.5
gallons
remain in
a standard tank,
and
2
gallons
remain
in a
long
range tank
(8 gallons
when long range integral tanks
are
installed) as unusable
fuel. The
indicators cannot
be
relied
upon for
accurate
readings
during
skids,
slips, or unusual attitudes.
The fuel selector
valve
should be in the BOTH
position
for takeoff,
80
May 1980
7-21