What is the 60 percent landing factor?

A typical Part 135 operator must plan to land on a maximum of 60 percent of the most likely runway, which means the weather, available approach and runway conditions at the time of departure must reasonably be expected so that the aircraft will come to a full stop within 60 percent of the available runway.



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Runway Conditions The following landing distance factors are typical: Wet runway: 1.3 to 1.4; • Standing-water or slush-contaminated runway: 2.0 to 2.3; • Compacted-snow-covered runway: 1.6 to 1.7; and, • Icy runway: 3.5 to 4.5.

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An uphill slope increases the take-off ground run, and a downhill slope increases the landing ground run. For example, an upslope of 2 percent increases take-off distance by about 15 percent and a 2 percent downslope decreases it by about 10 percent. Slopes can be calculated from known or estimated information.

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Shigatse Peace Airport, China (runway length: 5,000m) Shigatse Peace Airport (RKZ), a dual-use military and civilian airport in Shigatse, Tibet hosts the longest runway in the world. The new runway (09/27) stretches 5,000m (16,404 ft) long with a 60-meter asphalt overrun at each end.

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In aviation medicine, the 1% rule is a risk threshold that is applied to the medical fitness of pilots. The 1% rule states that a 1% per annum risk (See also risk management) of medical incapacitation is the threshold between acceptable and unacceptable.

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A good Rule of Thumb for estimating the advantage or disadvantage of a sloped runway is that a 1.0% runway gradient—an increase or decrease in altitude of 10' for every 1000' of runway length—is equivalent to a 10% increase or decrease in effective runway length.

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Some other runways appear to go up and down at different points. Answer: No, runways are not flat. They are crowned to help drain water off the sides during rain, and often one end of a runway is higher or lower than the other. When preparing takeoff performance calculations, pilots include the slope of the runway.

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1 Answer. Most Part-25 certified aircraft have an operating limit of roughly +/-2% for runway slope, as most of the runways fall into this category.

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