Not exactly true. Many airplanes have manual gear release systems if the mechanical systems fail [1]. These systems don't always work, true, and they may still

Not exactly true. Many airplanes have manual gear release systems if the mechanical systems fail [1]. These systems don't always work, true, and they may still have to land gear-up true, but there is a manual fail-over system and it does have to be used occasionally. If the rear wheels are already down, though, it's too late to try this. Aviation is not the type of industry where "failures can be handled automatically by the computer" is an acceptable answer. There's almost always manual systems in place for when the computers fail, which they do. [1] https://aviation.stackexchange.com/questions/16913/if-the-landing-gear-is-stuck-in-an-airliner-can-the-crew-go-down-and-manually-o https://aviation.stackexchange.com/questions/16913/if-the-la...