What counts as a catastrophic design flaw? Piston engines sometimes stop unexpectedly. This happens in general aviation, and sadly it quite often results in a

What counts as a catastrophic design flaw? Piston engines sometimes stop unexpectedly. This happens in general aviation, and sadly it quite often results in a fatal crash. If you ban piston engines and only allow turbine engines (which are much less prone to unexpectedly stopping), you effectively kill general aviation.