contaminated runway

contaminated runway

A runway that has standing water, ice, snow, frost, heavy rubber, or other substances present on its surface. A runway is contaminated with respect to rubber deposits or other friction-degrading substances when the average friction value for any 500-ft segment within the available landing distance (ALD) falls below the recommended minimum friction level and the average friction value in the adjacent 500-ft segments falls below the maintenance planning friction level. It also means more than 25% of the runway surface area within the required length and width is covered by surface water, slush, or loose snow more than 3 mm in depth, or there is ice on any part of the runway surface area.
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The model accounts for many contaminated runway scenarios, including hydroplaning, the effect of wind, the speed-dependent rolling-friction coefficient, and other important parameters.
Although contaminated runway conditions have been causal in numerous runway excursion accidents, the NTSB has not recommended applying existing technology that identifies hazardous runway surface conditions," said Pitts.
Flysmart can improve payload by a tonne on challenging missions, via more precise take-off performance calculation, and delivers more consistent results in degraded conditions, such as when landing on contaminated runways.
Unstable approaches--situations where the aircraft is too fast, above the glide slope, or touches down beyond the desired touchdown point--and contaminated runways are among the most common contributing factors to runway excursions on landing.
As part of an ongoing review, this statement provides preliminary information on (1) the extent to which large commercial airplanes have experienced accidents and incidents related to icing and contaminated runways, (2) the efforts of FAA and aviation stakeholders to improve safety in icing and winter weather operating conditions, and (3) the challenges that continue to affect aviation safety in icing and winter weather operating conditions.
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