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In reply to the discussion: BREAKING: Boeing 777 crashes at San Francisco Airport. [View all]Major Nikon
(36,925 posts)There are markings in the touchdown zone that pilots use for aiming points. Had the pilot been using the PAPI, it would have directed him to that area of the runway. It's simply good pilotage to land in that area because all the runway you don't use is wasted, and sometimes you actually do need all of it.
There are other things that could have gone wrong as well. Landing an airplane visually is basically an exercise in energy management. Too low or too slow can require more energy from the engines to correct. Too high or too fast can necessitate a reduction in power. You also have to maintain runway alignment while you are doing all of this. Sometimes pilots get behind the aircraft and overcorrect these situations and the only remedy in the end is to go around and try again. Pilot fatigue also comes into play on long flights.