Patent ID: 8437904

Claim:
A method to evaluate a condition of an aircraft engine precooler, comprising: receiving, in a processor-based health management system, a plurality of raw signals indicative of observation states of a plurality of operating variables associated with the aircraft engine precooler; smoothing the plurality of raw signals collected during a flight to obtain a per-flight diagnosis; performing, in the processor-based health management system, a joint probability analysis of the plurality of signals using a diagnostic model to generate a predictive failure prediction for the aircraft engine precooler; and reporting the predictive failure prediction to an aircraft health management system, wherein performing, in the processor-based health management system, a joint probability analysis of the plurality of signals using a diagnostic model to generate a predictive failure prediction for the aircraft engine precooler comprises: identifying a plurality of predictor nodes in a predictive failure model; and evaluating a predictive probability of failure based on the plurality of predictor nodes.