Voice Recorder

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Why cant data from cockpit voice recorder and flight data recorder be transmitted to a base station?

Flight data recorder and cockpit voice recorder (blackbox) of an aircraft reveal important clues to investigators to find the cause of the accident. But in few accidents, several hours are wasted in identifying these devices and some times it leads to failure. If this data is of such an importance, why can the data be streamed either to satellite or to any ground based station for easier and immediate diagnosis?

Both the CVR and DFDR are continuous loop records, holding only the last 30 minutes of information. The very name (Cockpit Voice RECORDER, Digital Flight Data RECORDER) should be a clue. Aircraft already are flying radios, HF, VHF, and many other radios are alread transmitting throughout the flight.

The DFDR for instance records over 134 parameters continuously. Given that aircraft travel over very long distances, there is no way a single base station could be connected to, and the connection maintained. A whole new set of radio stations all over the world would have to be constructed, or, a dedicated multi-million dollar satellite would have to be launched. It's not as simple as hooking the thing up to the HF radio. Additionally, the data is all in digital format. It would then have to be decoded continuously over the flight. Further, the pilots would pitch a fit! Why would the pilots allow their personal conversations in the cockpit to be constantly monitored (can you say 'Big Brother'?). The unions would NEVER allow that.

As mentioned above, for all of that effort and expense, you would use 1 out of every 1,000 data streams.

I like your "out of the box" thinking, it's just what we need in aviation to continue to innovate, but the impracticality of what you suggest overrides it potential usefulness.

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