Friday, November 14, 2008
Another day of flying thwarted by weather
My instructor makes an interesting and quite obvious point. With one mile visibility while on a one mile final, the pilot can see the VASI, PAPI and start of the runway. The far end is not visible. One of the techniques used to land is to hold a picture of the runway. The picture does not change (other than the size) during landing until the flare. The runway does not get longer and more narrow (too high) or shorter and wider (too low). This does not work well in conditions with less than one mile. The stabilized approach involves picking a point on the runway and holding that point steady with respect to a unmovable reference point (a spot on the windshield). This is still possible in 1 mile visibility, provided the point is the runway numbers. However, 1 mile is a short distance to pick a point when descending from 500 AGL at 65 knots and a descent rate of roughly 500 FPM. I look forward to more wisdom in this area.
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