According to a first aspect, the subject matter disclosed herein relates to a decision aid method for maintenance operations of aircraft equipment, the aircraft including a maintenance system arranged to make a record of equipment failure messages and of equipment failure warning messages emitted during a flight, the method comprising extracting at least one combination of failure messages corresponding to failure messages recorded by the maintenance system during a flight and a set of previous flights; determining, as a function of the at least one extracted combination, a probability of occurrence of at least one warning message possibly accompanied by one or more failure messages.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A decision aid method for maintenance operation of aircraft equipment, the aircraft comprising a maintenance system arranged to make a record of one or more equipment failure messages and equipment failure warning messages emitted during a flight, the method comprising: extracting, by computer processing, at least one combination of failure messages corresponding to failure messages recorded by the maintenance system during a flight and a set of previous flights; and determining, by the computer processing, as a function of the at least one extracted combination, a probability of occurrence of at least one warning message possibly accompanied by one or more failure messages. 2. The method according to claim 1, wherein: warning messages are represented as nodes of a directed graph comprising a set of arcs each provided with a transition probability from one warning message to another, each warning message of the graph corresponding to a given sequence of failure messages; the at least one extracted combination corresponds to the sequence formed by the failure messages recorded during the flight and the set of previous flights; the extracted sequence is represented as a mix of warning messages; and the determining a probability of occurrence comprises calculating a probability of occurrence of each of the warning messages of the graph made by a random walk on the graph initialised by the representation of the extracted sequence. 3. The method according to claim 2, wherein the random walk on the graph is a teleportation walk characterised by a probability α of following an arc of the graph provided with a transition probability and a probability (1−α) of skipping evenly randomly to a node of the graph. 4. The method according to claim 2, wherein a warning message of the graph corresponds to a given sequence of failure messages recorded before the occurrence of the warning message since the occurrence of a previous warning message. 5. The method according to claim 2, comprising classifying warning messages of the graph taking a relevancy between the determined probabilities of occurrence of each of the warning messages of the graph and an aircraft profile into consideration. 6. The method according to claim 1, wherein: extracting at least one combination of failure messages comprises identifying, from the failure messages recorded by the maintenance system during a flight and the set of previous flights, at least one combination of failure messages recognised to be likely to generate a given warning message; and the determining a probability of occurrence comprises determining a success rate for the prediction of the given warning message from the identified combination. 7. The method according to claim 6, comprising a prior learning step comprising recognising at least one combination of failure messages likely to generate a warning message and calculating an accuracy of the recognised combination to generate the warning message, and wherein the success rate for the prediction of the warning message from an identified combination initially corresponds to the accuracy. 8. The method according to claim 7, wherein the success rate is updated following each occurrence or lack of occurrence of the warning predicted message. 9. The method according to claim 8, wherein the occurrence of a predicted warning message is recorded when a maintenance operation has been performed since the prediction resulting in a lack of occurrence of the predicted warning message. 10. The method according to claim 6, wherein: extracting a combination of failure messages comprises identifying, from the failure messages recorded by the maintenance system during a flight and the set of previous flights, a portion of a combination of failure messages known to be likely to generate a given warning message; and the determining a probability of occurrence comprises determining a success rate for the prediction of the given warning message from the identified combination, the rate being assigned a weight. 11. A computer program product comprising code instructions for running steps of the method according to claim 1, when the program is run on a computer.