What is the maximum depth the "black box" can emit signal?

danny
  • What is the maximum depth the "black box" can emit signal? danny

    This is related to the recent disappearance and the fact that some claim the plane's black box to be deeply under water and that's why it cannot be located

Related questions and answers
  • Why is it that black boxes don't float? From what I gather the answer is: So they will not float away from a water crash site. The ping can be heard underwater with sonar. Finding the ping, finds the site. But why not have two black boxes one that floats and one that stays with the aircraft? That way if a plane is lost at sea, if we find the black box floating, we could use the data to find the other black box and the crash site. Plus the benefits of having a redundancy are enormous.

  • 202 incident, the black box had to be sent to Germany for data recovery: He stated that the box would be examined by "foreign experts" in Germany or France as Pakistan does not possess... to the Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile (BEA) in France. It is not clear who developed that black box. Was it the same company that manufactured the airplane? Also, can the buying airline use their own black box or their own security protocols for data encryption or encoding, to avoid having to send the black box out for analysis?

  • I never knew much about airplanes before the tragic incident of Malaysia 370. I have been spending a lot of time on Twitter reading various articles and investigations; in one of the articles I read, they stated that unlike transponders, "black boxes" cannot be turned off. However, each ELT is specifically designed for each aircraft, so it cannot be tampered with. You also cannot turn off the black box, as it runs throughout the flight, recording every 30 to 60 seconds. Is it really impossible to turn off the black boxes from within the plane?

  • At a frequency of 37.5 kHz a quarter wavelength is about 2 km long. How does the black box efficiently radiate anything if it is not attached to 2 km of antenna?

  • Why do they call flight data recorders a "black box" if it's orange in color? Just curious about this since I've seen several images of black boxes but they all come in orange colors, and not black. I can understand orange being used to help brightly identify the box , but then why call it a "black" box?

  • As I understand, there are two black boxes on-board an aircraft. One black box, the Cockpit Voice Recorder holds the cockpit conversations and the other, the Flight Data Recorder holds essential flight parameters. But why are the two black boxes holding separate data? Why don't both black boxes hold copies of both the FDR and the CVR data for extra redundancy in case the other box goes missing or is completely damaged by the crash? Are there any technical reasons for why this isn't possible or hasn't been attempted yet? Is there any benefit of having the CVR and FDR in separate boxes?

  • Black boxes put out a sonar ping at about 32kHz. From what I've read, depending on sea conditions the ping will be audible at the surface out to about 16 km, leaving a search area of around 1024 square km. By adding a little complexity to the ping circuit, you could encode within it the last received GPS position of the box, before it hits the water. With average sea depth and average sink angles of less than 45° that information would cut the search area down to about 10 square km. Is there some reason this tech is not used, or is it still in the rigorous testing pipeline these devices must

  • What is the black pod starboard of the front landing gear on this F-16-I? At first I thought that it was a laser finder, but upon closer inspection it seems to resemble some type of short cannon. What might it be?

  • This is related to the recent disappearance and the fact that some claim the plane's black box to be deeply under water and that's why it cannot be located

  • In too many cases of unfortunate incidents, hunting for FDR (or CVR also) is a major challenge. There are many or all answers recorded on that device. Why cannot a locator (GPS linked) be included in the black box? It has its battery which runs for several days and very rigid outer shell. Ordinary cell phones are GPS enabled which pinpoint their location with the accuracy of less than 10 feet or so. Cannot there be more sophisticated technology built-in black boxes?

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