DOC AIRBUS | AMM A320FDISTRIBUTION - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
A. Operation
(1) Oil flows from the oil tank to the lubrication pressure area of the lubrication and scavenge oil pump.
(a) Oil tank pressure of approximately 12 psi (0.8 bar) is kept to increase the inlet pressure to the pump for good pump section and to prevent pump cavitation.
(2) The lubrication and scavenge oil pump is used to pressurize the oil and move it through the main oil filter.
(a) From the main oil filter, the filtered oil flow is split by a metering orifice and flows to the fuel/oil heat exchanger bypass valve or to the system's main supply point (uncooled).
(b) The fuel/oil heat exchanger bypass valve divides the oil flow between the engine fuel/oil heat exchanger and air/oil heat exchanger. The heat exchangers control the supply oil temperature to the engine and components.
(3) After the pressurized oil temperature is decreased, part of the oil flow is supplied to the Fan Drive Gearbox (FDG) journal bearings. The remaining cool oil is mixed with the uncooled oil by a metering orifice and is supplied to the areas that follow:
- FDG gears by the Variable Oil Reduction Valve (VORV)
- No. 1, 1.5 and 2 bearing compartments by the VORV
- No. 3 bearing compartment
- No. 4 bearing compartment
- No. 5 and 6 bearing compartments
- Main Gearbox (MGB) and Angle Gearbox (AGB).
(4) Nozzles in the main bearing compartments and gearboxes supply the oil (at the correct flow rates) to the different bearings, seals, gears and accessory drive splines.
(5) Last chance strainers are supplied at the entrances to the compartments to keep debris added to oil distribution system downstream of the main oil filter out of the oil nozzles.
2. System Description
A. Function
(1) The oil distribution system comprises the systems that follow: