ENGINE OIL
The engine oil system supplies a flow of filtered oil to the engine in order to
cool, lubricate and clean different components.
The oil system consists of:
• integral oil tank
• pressure system
• scavenge system
• breather system.
The oil tank is integrated with the engine. It is an annular cavity created
between the air inlet case and the accessory gearbox rear case.
Oil level indication is achieved with two oil level sight glasses, one per each
side of the AGB (Accessory Gear Box).
Oil is pressurized by a gear pump mechanically driven by the engine AGB.
A pressure-regulating valve regulates the pressure system.
Pressurizze oil is cooled by the FCOC (Fuel-Cooled Oil Cooler) and filtered
by the Oil Filter which is provided with a bypass and an impending by-pass
indicator (popout red button).
Leaving the Filter, engine oil flows through the Fuel Heater and then it is
distributed to the pressure-lubricated bearings.
Oil pressure and temperature are sensed by two sensors that drive the
indicators on the MFD and by two switches that control the 1 (2) ENG OIL
PRESS warning and the 1 (2) ENG OIL TEMP caution messages in the
CAS, respectively.
Engine air pressure is used to pressurize various bearing cavities for
sealing. The air/oil mixture from the bearing cavities is routed to the AGB via
the scavenge system.
The scavenge system return the oil to the AGB by either gravity or dedicated
pumps. All returned oil flows near a magnetic chip detector located at the
inlet of the oil tank.
The oil breather system separates air from oil and vents it overboard through
the centrifugal impeller.