The benefits include better and less expensive maintenance of your engine, more efficient operation, and improved reliability. Here’s why:
Digital engine monitors provide the only way to actually see what is happening during the engine’s combustion process, measuring and recording information about the health of the fuel, ignition, induction, exhaust and turbocharging systems. The information is invaluable in diagnosing both mechanical problems and problems with operating technique.
For instance, a common failure mode of an exhaust valve shows a distinctive signature in engine monitor data. Ignition system problems visible in the data include marginal spark plugs and mistimed magnetos. Fuel system problems include mismatched or contaminated injectors and improperly adjusted fuel flows. Induction leaks are another problem that can be identified. It is also possible to identify failures in the digital engine monitor system itself, including failing temperature probes and poor wiring connections.
Identifying these problems before the aircraft goes into the shop has many benefits. Many engine-related problems can only be diagnosed while the engine is operating. Once it is in the shop, the opportunity for troubleshooting is gone. Even when diagnosis is possible by physical inspection of the engine, it is always much better to avoid “exploratory surgery” involving disassembly of engine components, especially cylinders. Exploratory surgery has two serious disadvantages: it is costly, and it can result in failures which are a result of the maintenance itself. These failures are common enough to have their own acronym: MIFs (maintenance induced failures).
We also find that many engine anomalies experienced by pilots result from misunderstandings about correct operating procedure. The engine monitor data can be invaluable in uncovering these problems and helping the pilot correct his powerplant management technique.
Learn more about your engine’s operation and the theory and benefits of engine monitor data analysis by reading Mike Busch’s educational articles.