Oil delivery system architecture

A gas turbine engine comprising:

• at least one engine component part receiving oil lubrication;
• and
• an oil delivery system providing a flow of oil to the at least one engine component part, the oil delivery system comprising:
• an oil reservoir;
• a first oil delivery circuit connected with the oil reservoir, the first oil delivery circuit including (a) a first oil distribution line delivering oil to at least one first circuit component part, (b) a first oil pump, and (c) a first switch valve;
• and
• a second oil delivery circuit connected with the oil reservoir, the second oil delivery circuit including (i) a second oil distribution line delivering oil to at least one second circuit component part, (ii) a second oil pump, and (iii) a second switch valve,
• wherein the first switch valve is configured to:
• receive first oil pressure feedback, via a first oil pressure output line, of a first oil pressure in the first oil delivery circuit downstream of the at least one first circuit component part;
• receive second oil pressure feedback, via a second oil pressure output line, of a second oil pressure in the second oil delivery circuit downstream of the at least one second circuit component part;
• and
• control a flow of oil through the first oil delivery circuit based on a first sensed oil pressure difference between the first oil pressure and the second oil pressure;
• and
• wherein the second switch valve is configured to:
• receive third oil pressure feedback, via a third oil pressure output line, of the second oil pressure in the second oil delivery circuit downstream of the at least one second circuit component part;
• receive fourth oil pressure feedback, via a fourth oil pressure output line, of the first oil pressure in the first oil delivery circuit downstream of the at least one first circuit component part;
• and
• control a flow of oil through the second oil delivery circuit based on a second sensed oil pressure difference between the second oil pressure and the first oil pressure.