Perfect? No. But no one, not being capable of noticing clear warnings has no business operating a vehicle, especially a commercial airplane. It is actually the

Perfect? No. But no one, not being capable of noticing clear warnings has no business operating a vehicle, especially a commercial airplane. It is actually the corner case, that the airplane refused to deploy the wheels. Usually, there is a technical problem preventing the deployment. So checking that the landing gear actually deployed should be one of the most fundamental things a pilot does, as well as looking out for error messages.