Identification and Location
The lube oil filter assembly is bolted to the Accessory Drive Gearbox (N1).
All the lubricating oil passes through the filter before
going to the engine components. A 40 micron wafer disc or an element type filter is used to filter all the lubricating oil before entering the engine. It filters from outside into the center and all deposits and contaminants stay on the outside of the filter. The filter contains a bypass valve, set to open at a 15 to 20 psig differential pressure, that allows the oil flow to bypass the filter element and supply oil to the engine if the filter element becomes clogged.