Originally Posted by
J.O.
Reasonable data can be collected from a box that has gyroscopic sensors and a GPS link.
Sure, a GPS logging device can probably be installed for a fairly reasonable price. However, in the incident at hand, TSB had fairly detailed position altitude, track airspeed,and vertical speed information available, and they are saying that they need flight data recorders to investigate accidents of this nature. I didn't see a description of that data they are recommending, but it's pretty clear from the context hat they mean more than position altitude, track airspeed,and vertical speed information.