Originally posted by TheKiecker
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There is a system that collects data of events that can be interesting for maintenance to know about in advance. There is a satellite datalink that, if available, will send this data almost in real time. If the datalink is not available when there is some data to send, the data will be stored and sent when the link becomes available again.
This system is event-based, not continuous streaming of parameters. For example, speed, altitude, etc are not reported. Failures of systems, cabin pressure outside the normal range, etc are reported.
In the AF447 case, we knew pretty quick that it was very likely an unreliable airspeed event thanks to that data.
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