Method and system for monitoring the level of oil contained in a tank of an aircraft engine

A method of monitoring a level of oil contained in a tank of an aircraft engine, the method comprising:

• for at least two predetermined operating stages of the engine, during at least one mission of the aircraft:
• measuring, by an oil level sensor, a plurality of measurements of an oil level of the tank,
• measuring an oil temperature and an engine speed of rotation associated with each measurement of the oil level of the tank,
• storing, in a memory of a first computer, the measurements of the oil level of the tank and the associated oil temperature and associated engine speed of rotation, and
• selecting, using the first computer, measurements representative of oil level variations having both oil temperatures that are within a predetermined range of a reference temperature and engine speeds of rotation that are within a predetermined range of a reference speed of rotation corresponding to an iso-condition;
• aggregating, using a second computer, only the measurements corresponding to the iso-condition selected over the operating stages during the at least one mission of the aircraft to produce a curve of the oil level of the tank;
• and
• comparing, using the second computer, the curve produced by the aggregated measurements with reference data to identify abnormal oil consumption of the engine.