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.
References in periodicals archive ?
Following an incident at Newcastle Airport, UK, in November 2010 in which a Boeing 737-800 landed during snowfall and stopped 10ft (3m) beyond the end of the marked pavement, the Civil Aviation Authority (CAA) has clarified its definition of a 'contaminated runway.'
They ask for the CAA to publish a clearer definition of a 'contaminated runway' and to develop a system for measuring snow that enables pilots to determine the landing distance required.
They have asked the CAA to publish a clearer definition of a "contaminated runway".
Other things that required thought and aircraft management adjustments included: restrictions on selecting reduced power for takeoff during certain wind or contaminated runway conditions; crew resource management adaptations for the three-man crew folks; the tendency for new-generation pilots to rely on computer-generated data without knowing how it was derived or questioning it when it "just didn't seem right"; the tendency for all of us "old dogs" to still want "all she's got on every takeoff--just in case"; and, the uncomfortable feeling during the seemingly-forever-engine-spool-up-time when executing a missed approach.
A wet or contaminated runway further increases the distance you'll need to stop, and can reduce the effectiveness of your brakes.
Possibly, but more likely they describe the factors contributing to another NTSB report on a contaminated runway overrun.
Charts for a 737-200 advise crews how much to modify the airplane's weight--lighter is better--and speed--V1 speeds generally are reduced, allowing aborts from lower speeds--to obtain necessary performance on a contaminated runway. Most of the airplanes we fly don't have that data, but we, too, can lighten up and slow down.
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.
A realistic analysis of operational landing and stopping performance of large-transport-category airplanes on contaminated runways in adverse conditions is presented by Daidzic and Shrestha (2008).
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.
And during snowy or icy conditions, regional jets on so-called "contaminated runways" need a much greater landing distance.
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