Abstract »Over the last few decades a significant change in the business model of the aircraft engine companies has taken place. The relative importance of the fly by the hour (FBH) or power by the hour (PBH) type of approach has grown from being relatively marginal to be, in many cases, the main source of income and an essential tool to improve reliability and safety aspects. In terms of maintenance, a direct consequence, has been the transformation from a mostly preventive maintenance, where the engine was refurbished at fixed intervals, and the actions at each interval were generally predetermined, to a predictive model. To handle these changes, the original Engine Health Monitoring has evolved to an Engine Health Management, both of them preserving the EHM acronym
Some real examples are provided to show how the EHM is able to help in normal operation and also under failure conditions.
Finally, some considerations are made about the future challenges and opportunities of the EHM. All these aspects will be complemented by new on-wing inspection and repair capabilities. A step change is therefore expected in the reliability parameters of the aircraft engine sector, which will be of paramount importance considering the continuous growth of the sector.