OPERATION MANUAL
SILA 450 c
AERO EAST EUROPE
Date 01.09.2015.
Revision 00
Page | 48
AIRPLANE & SYSTEMS DESCRIPTION
Each fuel tank is in communication with the central drain bowl and no selection right/left is
previewed.
The fuel flows by gravity from the two wing tanks trough a drain bowl to a two-position
selector valve labeled ON and OFF. Fuel system venting is essential to system operation.
Blockage of the venting system will result in decreasing fuel flow and eventual engine
stoppage. Venting is accomplished by two dynamic air intakes located close the wing struts.
The fuel level in the tanks is directly showed by a transparent hose located in the upper left
and right side of the cockpit.
The indicators cannot be relied upon for accurate readings during skids, slips, or unusual
attitudes. A red line marked on the transparent hoses indicates the quantity of remaining
fuel considered unusable. The availability of the above defined “unusable fuel” depends on
the attitude of the aircraft but for safety reasons the red line must stand for EMPTY tank.
When a 10 Liters reserve tank is present the red LOW FUEL light will switch on as soon as the
volume of fuel in the reserve tank is decreased. Low fuel Light ON has to be intended as a
distress situation and a correct and safe flight planning must never lead to the use of the fuel
in the reserve tank.
The reserve fuel tank is equipped with an air valve drainer; in case of a non correct air
draining during preflight procedures may result in anomalous LOW FUEL indication while
flying above about 4000ft.
In case of distress flight condition of low fuel:
As soon as the red indicator light turns on reduce speed and allow the aircraft to fly
with a “nose up” attitude in order to maximize the availability of the remaining fuel in the
tow main tanks until the light turns again off. This operation may be carried on for one or
two times until the alarm LOW FUEL red light will be constantly ON, from this moment no
more of about 0,5 Liters of fuel must be taken into account.
Prolonged slips, deeps and skids may lead to an anomalous LOW FUEL alarm indication when
the fuel amount in the two wing tanks contain less then about 1/3 of their capacity: the red
light will turn off as soon as the aircraft will return in a usual flight attitude. Anomalous or
unusual prolonged deep attitudes must be avoided if no reserve fuel tank is installed when
the total fuel amount is less then about 1/3 of the tanks capacity.
Unequal fuel flow from each tank may occur if the wings are not maintained exactly leveled.
NOTE:
The fuel system is equipped with drain valves to provide a means for the examination of fuel
in the system fuel contamination and grade. The system should be examined before the first
flight of every day and after each refueling, by using the sampler cup provided to drain fuel
from the tank sump. The fuel tanks should be filled after each flight to prevent condensation.
NOTE:
Let the fuel to flow out also up to 20-30Ltr if you feel it is necessary to drain out dirtiness or
water. Fuel MUST flow and spill out CLEAN!
The airplane is equipped with a standard fuel system.
The fuel system consist form two tanks (one in each wing) connected at one collection tank
at the bottom of the fuselage, which volume is 0,4 liters. Systems have two positions ON or
OFF. When switch in in position ON fuel flow in same quantity from both tanks through the
collection tank. When wing tanks are empty system give the signal by red lamp, low fuel,
that means system suck fuel from collection tank, pilot must landed in maximum of 35
minutes
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Please be informed what kind of additional equipment is installed on aircraft