Commercial aircraft are expensive, and only make money when they are flying. For this reason, efficient operators perform as much service as possible in-flight, and during the turn-around time in a terminal. To make this process possible, embedded computer systems test aircraft systems, and also collect information about faults in equipment that they control. This information is normally collected in an on-board maintenance computer, and sometimes transmitted ahead to help order spares. Although this sounds ideal, in real life, these self-test systems are often not considered flight-critical, and therefore they are sometimes unreliable, and trusted only to indicate that a device requires service.
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