The EAFR is a new recording system with a new flight data recording format, and the
787 is currently the only airplane that uses the EAFR to record CVR, FDR, and other data. The
investigation of this incident found that the EAFR recorded stale data for some parameters (see
section 1.3). The recording of stale data impacted the early stages of this investigation because
significant additional effort was required to identify stale data when possible as well as those
parameters for which it was not possible to determine whether the data samples were stale. This
process delayed the NTSB’s complete understanding of the recorded data.