This is in fact a film rather than a series, but thought I would mention it.
It is a straight forward story line about a bit of a nerdy investigator thinking his department (responisble for analysing Black Boxes after a plane crash) is not picking up on information recorded prior to a crash.
If you like techy style investigation, rather than police procedurals, might be something to fill a gap in your tv schedule!
https://www.bbc.co.uk/programmes/m001sftz
More plausible than the first Departure IMO)