PPRuNe Forums - View Single Post - AF 447 Search to resume (part2)
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Old 17th May 2011, 18:04
  #1642 (permalink)  
GarageYears
 
Join Date: Jun 2009
Location: VA, USA
Age: 58
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They don't simply connect a laptop to the FDR and CVR and download a PowerPoint presentation.

It takes quite some time and effort to derive the most accurate transcription possible from the CVR.

Once finalised by the working team, the transcript may be matched up to the FDR traces using the synchronised time code.
Hahahaha... well done.

Firstly, please don't tell Microsoft... really no Powerpoint?

Ok, so now the comedy is finished... right?

It DOES NOT take weeks - I routinely handle test flight data - audio striped with a timecode on one track on the audio recordings, and performance data striped on the data captures. Synching the two is not difficult, particularly since in this case the encoding is well known ahead of time.

What will take time is ensuring the exact transcription is provided, since in many cases the audio is not exactly the clearest, particularly when things are not exactly going as planned.

However, and this can be argued, the primary content of the CVR will be easily determined from the first few listens through I'm pretty sure, and it doesn't take a rocket scientist to copy/format convert the recording to .WAV format to allow analysis on a standard soundfile editor (Adobe Audition or Audacity for example), which gives you simple view of the waveform against time. Since the recording is realtime, timing does not have to be millisecond accurate to make sense of the key events.

Whether or not, those initial broader findings can/should be released is not my place to argue, but I would be dumbstruck if it were not very easy to determine who was in the cockpit (FO1 and FO2, or some other combination of occupant) for example. But now my point is drifting.

It does not take weeks to synch the FDR to the CVR. And at that I will exit stage left...

Last edited by Jetdriver; 18th May 2011 at 05:39.
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