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The 777 aircraft reports ACARS (Aircraft Communications Addressing and Reporting System) every thirty minutes and it is typical of pilots flying overseas to squawk transponder code 2000 immediately after signing off from the regional ATC. If a secondary radar was not listening to the 2000 frequency it would have no record of the plane in that region. So, if the plane did go down in the 30 minute block between the ACARS transmission, AND AFTER the sign off, it would easily explain the radio silence, because the plane wasn't silent, it just wasn't transmitting & was not visible to secondary radar.

Obviously, this means the plane had to go down very quickly (because it had so much altitude) and while being a consolidated mass (blown up or shattered planes scatter debris which are easily identified). It's very possible they suffered from an electrical failure from a fire, but it's much more plausible there was some control surface failure. For example in Alaska Airlines 261's case the horizontal stabilizer jack-screw failed unconstraining the entire horizontal stabilizer causing the plane immediately dive 31,000ft and hit the water in under 5 minutes.

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