Oil filtering system

A gas turbine engine comprising two components requiring lubrication;

• an oil circuitry for circulating oil for lubricating the two components;
• and an oil filtering system in fluid communication with the oil circuitry, the oil filtering system comprising a first filtering section having a first inlet, a first outlet, a first oil filter disposed between the first inlet and the first outlet, the first outlet fluidly connected with a first one of the two components;
• a first bypass conduit interconnecting the first inlet to the first outlet;
• a first valve in the first bypass conduit, the first valve having a closed configuration and an opened configuration, the first inlet fluidly connected to the first outlet at least via the first bypass conduit in the opened configuration of the first valve, and via the first oil filter in the closed configuration of the first valve, the first filtering section having a monitoring sensor;
• a second filtering section having a second inlet, a second outlet, a second oil filter disposed between the second inlet and the second outlet, the second outlet fluidly connected to a second one of the two components;
• a second bypass conduit between the first inlet and the second outlet;
• and a second valve disposed in the second bypass conduit, the second valve having a closed configuration and an opened configuration, the second outlet fluidly connected to the first inlet via the second bypass conduit in the open configuration of the second valve, and to the second inlet via the second oil filter in the closed configuration.

A method of operating an oil filtering system comprising a first oil filter and a second oil filter, the method comprising:

• receiving a first oil flow and a second oil flow to be filtered in a respective one of the first and the second oil filters;
• directing the first oil flow and the second oil flow through the oil filtering system in accordance with one of four configurations of the oil filtering system;
• cooling the first oil flow upstream of the oil filtering system;
• outputting a first output flow of oil and a second output flow of oil, wherein:
• in a first configuration, the method comprises:
• filtering the first oil flow in the first oil filter;
• and
• filtering the second oil flow in the second oil filter,
• in a second configuration, the method comprises:
• directing the first oil flow to bypass the first oil filter;
• and
• filtering the second oil flow in the second oil filter,
• in a third configuration, the method comprises:
• directing the first and second oil flows toward the first oil filter;
• filtering a portion of the first and second oil flows in the first oil filter;
• and
• directing a remainder of the first and second oil flows to bypass the first oil filter,
• in a fourth configuration, the method comprises:
• directing the first and second oil flows toward the first oil filter;
• and
• directing the first and second oil flows to bypass the first oil filter;
• and
• monitoring the first valve.