Comments by "calvingreene90" (@calvingreene90) on "Why Guns Take Years to Get Into Production" video.

  1. It's not guns but the complicated double valve that caused a couple of 737s to crash to have the problem required two parts to be at the extreme limit of their design tolerances in the specific complementary way and the only failed if the valve was very cold and was fed very hot hydraulic fluid. Diagnosing the problem was much harder than fixing it. The valve has been entirely replaced with a different design that can't have that particular problem.
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