Failure detection of an oil transfer seal

A gas turbine engine, comprising:

• a combustor;
• a turbine rotationally driven about an engine central axis of the gas turbine engine by combustion products of the combustor;
• and
• a lubricant transfer arrangement including:
• a first rotationally fixed component;
• a second component configured to rotate;
• a lubricant transfer seal disposed radially between the first component and the second component configured to direct a flow of lubricant from a first location at the first component to a second location at the second component, wherein the lubricant transfer seal is rotationally fixed and configured to seal to at least one of the first component and the second component;
• and
• a lubricant pressure sensor disposed along a lubricant pathway fluidly upstream of the lubricant transfer seal;
• wherein a drop in a lubricant pressure measured by the lubricant pressure sensor is indicative of damage to or failure of the oil transfer seal.

A lubrication system of a gas turbine engine, comprising:

• a lubricant flow circuit, including:
• a lubricant supply;
• and
• a lubricant transfer seal disposed between a rotationally fixed component of the gas turbine engine and a rotating component of the gas turbine engine, the lubricant transfer seal having one or more transfer seal passages to direct a flow of lubricant to the rotating component;
• and
• a lubricant pressure sensor disposed along the lubricant flow circuit configured to measure a pressure of the flow of lubricant in the lubricant flow circuit;
• wherein a drop in the measured pressure is indicative of damage to or failure of the lubricant transfer seal.