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How Slippery Is It?

Gabriel Widyna SWA1248, a year-old Boeing 737-700, came to rest on a nearby street after rolling off the end of Midway's Runway 31C while trying to stop after landing in a snowstorm. The accident was one of the catalysts for what we now know as RCAM, the Runway Condition Assessment Matrix.
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Key Takeaways:

  • The Runway Condition Assessment Matrix (RCAM) system was developed to standardize the objective reporting of runway contamination, replacing subjective methods after accidents like Southwest Airlines Flight 1248 highlighted the critical need for better data.
  • RCAM assigns numeric codes to sections of a runway based on contaminant type and depth, enabling pilots to predict aircraft takeoff and landing performance more accurately, especially for transport category aircraft with corresponding manufacturer data.
  • Understanding RCAM is crucial for thorough preflight planning in winter conditions, and pilots must prioritize safety by making informed decisions and diverting if runway conditions are doubtful.
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It’s no secret that winter weather can wreak havoc on otherwise routine aircraft operations. One of the most common signs of the season we must deal with is runway contamination, when ice, snow, slush and whatever else Mother Nature throws at the airport can combine to turn an otherwise excellent runway into a skating rink. While getting to the runway may pose its own challenges, getting on or off it can be the most treacherous part of winter flying.

The good news is there’s a well-organized and consistent way to report runway condition observations, which can then be used with manufacturer’s data to realistically predict airplane performance, especially aboard transport category airplanes. The RCAM (Runway Condition Assessment Matrix) system replaces earlier methods of assessing and categorizing runway contamination of all sorts. Understanding RCAM’s background and use can help us assess how different conditions affect both landing and takeoff operations on contaminated runways.

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