SECTION?
AIRPLANE &.$YSTEMS
DESCRIPTION
CESSNA
MODEL 172S
FUEL
FUEL LEVEL
TOTAL
. TOTAL
TOTAL USABLE
TANKS
(QUANTITY
.
FUEL
UNUSABLE
ALL FLIGHT
EACH TANK)
. CONDITIONS
I
,
..
:
Two
Full (28.0)
,
56.0"
3.0
53.0
: 11
~'!
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,
iabeled
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 Jthe 'fuel
strainer to an engine driven fuel pump.
,
. ' . From t~e engjne-driv~n fuel pump; fuel is delivered to thefuellair
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 contin'uous,
and flow rate is ,determimfd
by the
amount of air passing through the fuel/air control unit.
.
'
{'"
~
I
Starling
at
serial
number
172S9491
and
on,
and
airplanes
incorporating
MK172-28-01,
a fuel, return
system
was
added
to
promote smoothengine
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 fuei reservoir tank.
The increased
fuel
fiow 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 5
Содержание Cessna 172S Skyhawk SP
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