Oil nozzle health detection using liquid flow test

A system for detecting obstructions in one or more oil nozzles of a lubrication system of an aircraft engine, comprising:

• a flow measuring unit having an external supply of a testing liquid, a pump fluidly coupled to an outlet of the flow measuring unit, a flow measuring device operable to measure a flow resistance through the one or more oil nozzles, and an inlet of the flow measuring unit;
• and
• a calibration circuit having one or more calibration nozzles corresponding to the one or more oil nozzles of the lubrication system, an inlet of the calibration circuit fluidly connectable to the outlet of the flow measuring device and disposed upstream of the one or more calibration nozzles, and an outlet of the calibration circuit fluidly connectable to the inlet of the flow measuring device and disposed downstream of the one or more calibration nozzles;
• wherein the flow measuring unit is operable to circulate the testing liquid through the calibration circuit to measure a baseline flow measurement for the one or more calibration nozzles and to circulate the testing liquid through the one or more oil nozzles of the lubrication system to compare a flow measurement through the one or more oil nozzles to the baseline flow measurement.

A method for detecting obstructions in an oil nozzle of an aircraft engine, comprising:

• determining a baseline flow measurement for the oil nozzle by flowing a testing liquid through an unblocked nozzle corresponding to the oil nozzle and measuring a flow resistance through the unblocked nozzle;
• flowing the testing liquid through the oil nozzle;
• measuring a flow resistance of the testing liquid through the oil nozzle;
• and
• comparing the flow resistance of the testing liquid through the oil nozzle with the flow resistance of the testing liquid through the unblocked nozzle.