Why perfecting visual approach landing is necessary for pilots

The Asiana Airline plane that crash landed in the US. Speculation has centred on whether this was a badly managed visual approach. Photo/AFP

Last week, an Asiana Airlines Boeing 777-200 arrived at San Francisco after a scheduled ten-hour flight from Seoul.

The weather at the time of arrival was good, but the instrument landing system— specifically the part that provides vertical guidance —had been declared unserviceable. Consequently the air traffic controllers cleared the plane for a visual approach to runway 28L.

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