Textron Cessna 172R User Manual

SECTION
7
AIRPLANE
&
SYSTEMS
DESCRIPTION
CESSNA
MODEL
172R
FUEL
TANKS
FUEL
LEVEL
(QUANTITY
EACH
TANK)
TOTAL
FUEL
TOTAL
UNUSABLE
TOTAL
USABLE
ALL
FLIGHT
CONDITIONS
Two Full
(28.0)
56.0
3.0 53.0
Figure
7-5.
Fuel
Quantity
Data
in
U.S.
Gallons
FUEL
DISTRIBUTION
Fuel
flows
by
gravity
from
the
two
wing
tanks
to
a
three-position
selector
valve,
labeled
BOTH,
RIGHT
and
LEFT
and
on
to
the
reservoir tank.
From the reservoir
tank
fuel flows
through
the
auxiliary
fuel
pump,
past
the
fuel shutoff
valve,
through
the
fuel
)
strainer
to
an
engine
driven
fuel
pump.
From
the
engine
driven
fuel
pump,
fuel
is delivered
to
the
fuel/air
control
unit,
where
it
is metered and
directed
to
a
fuel
distribution
valve
(manifold)
which distributes
it
to
each
cylinder.
Fuel
flow
into
each
cylinder
is
continuous,
and
flow
rate
is
determined
by
the
amount
of
air
passing
through
the
fuel/air
control unit.
I
Starting
at
serial number
17281188
and
on,
and
airplanes
incorporating
MK172-28-01,
a
fuel
return
system
was
added
to
promote
smooth
engine
operation
on
the
ground
during
hot weather.
The
return
system
carries
a
metered
amount
of
fuel from
the
engine
fuel-air
control unit
to
the
fuel
reservoir tank. The
increased
fuel
flow
due
to
the
return
system,
results
in
lower
fuel
temperatures
at
the
engine
inlet and
helps
to
minimize the
amount
of fuel
vapor
generated
in
the
fuel
lines
during high
OAT
operations.
7-24
Revision
9
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Textron Cessna 172R Specifications

General

Brand	Textron
Model	Cessna 172R
Category	Aircrafts
Language	English