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COMPONENTS AND OPERATION Oil is supplied to the engine by the oil pump that draws hot oil from the accessory gear box (AGB) oil tank. The oil is filtered and cooled in the fuel heater/oil cooler (FHOC) prior to flowing into the engine bearing sumps. In the engine bear-ing sumps (forward and aft) and in the AGB, the oil lubricates the bearings, seals, and gears and cools them by absorbing heat directly as it passes in and around these components.The oil is scavenged by dedicated scavenge pumps and returned to the oil tank. Power to drive the oil pump is provided by the compressor spool trough the AGB. An oil filter bypass valve and an impending bypass switch are located in parallel with the filter. The switch provides a warn-ing when the filter becoming clogged and the pressure drop across it reaches 45 psi, indicating that impending bypass is imminent. The bypass valve opens at 65 psi. The ECU monitors the switch and the oil temperature, and provides an indi-cation of impending filter bypass to the cockpit when the switch is open and oil temperature is in the normal operating range. During bypass mode, the system still provides a minimum filtration level by means of an accessible last chance screen. Once the impending bypass warning has been indicated, the CAS message remains illuminated during the bypass mode and logged by the FADEC to direct maintenance action prior to the next flight. Before oil is returned to the oil tank it flows across the chip detector in the AGB housing. The chip detector is linked to the ECU to provide an indication on the EICAS. Chip detector and impending oil filter bypass advisory CAS messages are presented as L (R) ENGINE OIL CHIP and L (R) ENGINE OIL BYPASS. ENGINE OIL PRESSURE INDICATIONS To provide system redundancy, a pressure switch and separate pressure transmitter are used to monitor the engine oil pres-sure. When low oil pressure is detected by the pressure switch, a L (R) ENG OIL PRESS LOW (W) is presented. Exces-sively high oil pressure is indicated by a L (R) ENG OIL PRESS HIGH (C). An imminent bypass of the oil filter is annunciated by a L (R) ENGINE OIL BYPASS (A) CAS message. Volume 2 Flight Crew Operating Manual Feb 22/2006 CSP 100-6 REV 5 18-01-10 ENGINE OIL SYSTEM (Cont) ENGINE OIL LEVEL AND REPLENISHMENT SYSTEM |
