Johnny Pixels
Graduate Poster
- Joined
- Nov 24, 2005
- Messages
- 1,389
I've just read this footnote in the official report with regard to the Flight 93 impact:
The signal to noise ratio is too high to be accurate, although I'm guessing it's not as high as 3:97
We also reviewed a report regarding seismic observations on September 11, 2001, whose authors conclude that the impact time of United 93 was “10:06:05±5 (EDT).”Won-Young Kim and G. R. Baum, “Seismic Observations during September 11, 2001,Terrorist Attack,” spring 2002 (report to the Maryland Department of Natural Resources). But the seismic data on which they based this estimate are far too weak in signal-to noise
ratio and far too speculative in terms of signal source to be used as a means of contradicting the impact time established by the very accurate combination of FDR, CVR,ATC, radar, and impact site data sets.These data sets constrain United 93’s impact time to within 1 second, are airplane- and crash-site specific, and are based on time codes automatically recorded in the ATC audiotapes for the FAA centers and correlated with each data set in a process internationally accepted within the aviation accident investigation community. Furthermore, one of the study’s principal authors now concedes that “seismic data is not definitive for the impact of UA 93.” Email from Won-Young Kim to the Commission,“Re:UA Flight 93,” July 7, 2004; see also Won-Young Kim,“Seismic Observations for UA Flight 93 Crash near Shanksville, Pennsylvania during September 11, 2001,” July 5, 2004.
The signal to noise ratio is too high to be accurate, although I'm guessing it's not as high as 3:97