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OPERATION MANUAL
SILA 450 c
AERO EAST EUROPE
Date 01.09.2015.
Revision 00
Page | 45
AIRPLANE & SYSTEMS DESCRIPTION
Oil for the engine lubrication is supplied from a sump at the bottom of the engine. The
capacity of the engine sump is seven quarts (one additional quart is contained in the full flow
oil filter. Oil is drawn from the sump through an oil suction strainer screen into the engine
driven oil pump. From the pump oil is routed to a bypass valve. If the oil is cold, the bypass
valve allows the oil to bypass the oil cooler and go directly from the pump to the full flow oil
filter. If the oil is hot, the bypass valve routes the oil out of the accessory housing And into a
flexible hose leading to the oil cooler on the right rear engine baffle. Pressure oil from the
cooler returns to the accessory housing where it passes through the full flow oil filter. The
filter oil then enters a pressure relief valve which regulates engine oil pressure by
allowing excessive oil to return to the sump while the balance of the oil is circulated to
various engine parts for lubrication. Residual oil is returned to sump by gravity flow. An oil
filter cap/oil dipstick is located at the right rear of the engine. The filler cap/dipstick is
accessible through an access door on the top right side of the engine cowling. The engine
should not be operated on less than five quarts (3 liters) of oil.
7.10 IGNITION-STARTER SYSTEM
Engine ignition is provided by two engine-driven magnetos, and two spark plugs in each
cylinder. Normal operation is conducted with both magnetos due to the more complete
burning of the fuel-air mixture with dual ignition. Ignition and starter operation is controlled
by a rotary type switch, ignition button, left and right magneto switch with red covers
located on the left of the control panel. The engine should be operated on BOTH magnetos
except for magneto checks and emergency use only. When the switch is rotated the master
relay is energized and battery is giving tension to the circuits. Pressing the start button
crankshaft an propeller will rotate, in this way (but for no more than 6-10 secds) let the oil
pressure gouge show a pressure increase than turning the magnets switches in the ON
position, the engine will start.
Warning: Never handle or turn the propeller operating by hands with the magnets in the ON
position, this may result in a sudden and unexpected engine start.
7.11 AIR INDUCTION SYSTEM
The engine air induction system receives air through an intake in the front portion of the
engine cowling (+from a lateral NACA intake vent) or from the heat exchanger situated on
the exhaust pipe pot: this is selected by the pilot through the WORM/COLD control.
Depending on the choice of accessories the air driven in the cowling may be directed to an
airbox (if any) or directly to the conics air filters mounted on the carburetors (in this case no
device will allow any WORM/COLD selection). When an airbox system is present the air-
filter, which removes dust and other foreign matter from the induction air, is situated in the
airbox. Airflow passing through the filter in the airbox, enters the inlet in the carburetors
which are on the engine sides, then ducted to the engine cylinders through intake manifold
tubes. In the event of a carburetor icing condition heated air can be obtained pulling the
carburetor heat control (WORM position) on the instrument panel. Both Cold and worm
surceases are filtered. The use of full carburetor heat at full throttle will result in a loss of
approximately 75 to 250 RPM.
To obtain full power (takeoff and pulling up) it is
recommended the COLD position. In every situation where an icing condition is suspected,
while descending or when power will be sensibly reduced WORM position is recommended.