An auxiliary power unit (APU), as its name suggests, is not as essential as an engine. It is not as much of a differentiating factor as an avionics suite and so, it has not benefited from much product improvement effort by manufacturers. APUs are not at the center of the race for ever-greater aircraft efficiency. But an APU can be seen as a mini-engine running on the ground. And it just happens that engines are at the spearhead of predictive maintenance —the holy grail in repair ...


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