Originally Posted by HN39
My question is: Does this trace only indicate what source the DFDR/DFDAU is using for the recorded V/S, or does this have implications for other systems, such as the calculation of FPA/FPV (note FPA trace lower down on same chart)?
I don't have the answer to the question, but as long as the VS takes its source on the IR, the recorded VS and FPA make sense. When the source is the ADR, both values seem to be erratic and unreliable.
Originally Posted by HN39
The graph on page 42 of Interim no.3 shows V/S in better resolution, and indicates that the variations are due to turbulence
The BEA is not that affirmative :
Consequently, it would appear at this stage in the work that the bulk of the aircraft movements in the longitudinal axis (attitude, vertical speed, altitude) result from the actions of the PF, with the exception of small variations that are probably due to the meteorological disturbances.