SECTION 7 CESSNA
AIRPLANE AND SYSTEMS DESCRIPTION MODEL 182T NAV
Ill
FUEL
SYSTEM
(Continued)
FUEL DISTRIBUTION
Fuel flows by gravity from the two wing tanks through the fuel
manifold (aft pickup only),
and to a four position selector valve.
From the selector valve, fuel flows through the auxiliary fuel pump,
the fuel strainer, and to the engine driven fuel pump. A portion of
the fuel (approximately
7
gallonslhour) is returned to the wing tank
currently selected through the use of the fuel return system. From
the engine driven fuel pump, fuel is delivered to the
fuellair control
unit on the bottom of the engine. The
fuellair control unit (fuel
servo) meters fuel flow in proportion to induction air flow. After
passing through the control unit, metered fuel goes to a fuel
distribution valve (flow divider) located on top of the engine. From
the fuel distribution valve, individual fuel lines are routed to air bleed
type injector nozzles located in the intake chamber of each cylinder.
FUEL INDICATING SYSTEM
Fuel quantity is measured by two float-type fuel quantity sensors
(one in each tank) and is displayed on the Engine Indicating System
(EIS) pages.
The indicators are marked in gallons of fuel.
An
empty tank is displayed on the fuel quantity indicator (FLIEL QTY
GAL) as a red line on the far left of the indicator scale, and the
number
"0".
When an indicator shows an empty tank, approximately
2.5 gallons of unusable fuel remain in the tank. The indicators
should not be relied upon for accurate readings during skids, slips
or unusual attitudes.
The fuel quantity indicator shows the fuel available in the tank up to
the limit of the sensor float travel. At this level, additional fuel may
be added to completely fill the tank, but no additional movement of
the float or the indicator will result. The limit for sensor float travel
is approximately
36
gallons and is indicated by the maximum limit
of the green arc. When the fuel
level decreases below maximum
travel of the fuel sensor, the fuel quantity indicator will display fuel
quantity measured in each tank.
A
visual check of each wing tank
fuel level must be performed prior to each flight. Compare the
visual fuel level and indicated fuel quantity to accurately estimate
usable fuel.
(Continued Next Page)
7-40
U.S.
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