Aircraft fault diagnosis prognostics and health management based on flight recorder

A flight recorder is very important onboard flight safety equipment, ant it plays a very important role in aircraft fault diagnosis prognostics and health management(AFDPAHM). It is thought that there are three methods when a flight recorder is applied in AFDPAHM after the composition and characteristics of flight reorder information have been studied: the first is analytical redundancy ones, the second is parameter trend forecasting ones, and the third is fault tree ones etc. The application of the three methods in AFDPAHM has been discussed in detail in this paper. These three methods have their advantages and disadvantages respectively. When the mathematical model of a subsystem or device is easy to be set up, the analytical redundancy method can be applied. When the failure mechanism of the subsystem or device is very complicated and it is very difficult to set up its mathematical model, the parameter trend predication can be used. When the logic relationship of internal structure of the subsystem or device is very clear and the failure probability of every component can be obtained, then the fault tree method is available.