.. which is why the Regulator concerned with the fleet mentioned above is more than happy for us to review DFDR data routinely .. if we find the box or individual parameters a bit suspect .. we fix it and the base incident/accident investigation tool is there for the rare occasion on which it might be required for such purposes ...
concurrence and reasonableness is achieved through daily detail analysis
label me "an anal engineer" but it seems to me that, for the relevant parameters, a periodic inflight calibration validation is essential .. then one has some baseline real data upon which to base routine work ..