Deployable Recorders
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Surely there is a now a case to fit the FDRs and CVRs higher in the tail or rear bullet of ETOPS and LROPS over water flights that go outside radar coverage. They could be barostatically detached at a specified depth under water and fitted with a hi-vis, flotation device that has a solar-powered ELT. Regardless of cost this must surely be designable to avoid the anguish of the relatives after such an event.
CNN ran a piece about 4 weeks ago regarding an existing design. During the discussion, they quoted an installed cost of $100,000 to retrofit one plane. They went on to say the cost was minimal compared to the $1,000,000/plane cost to install Wi-Fi.