Winter Runways

The chief advantage of being instrument-rated is being able to travel in less-than-ideal weather. But, in winter, the triumph of a well-flown ILS to minimums in moderate snow can quickly turn to sheer terror after your smooth touchdown if you find yourself slipping off the side of an icy runway.Handling the aircraft is one thing; but, we must first understand what information is available about runway conditions, and how we can use that information to enhance our decision making and influence our technique.

Key Takeaways:

• Pilots rely on two distinct types of runway condition reports: subjective "braking action reports" (good, fair, poor, nil) and quantitative "runway friction reports" (MU values).
• Braking action reports are critical for operational decisions, with "poor" or "nil" reports triggering advisories and "nil" reports requiring runway closure.
• Quantitative MU values (0-100 scale), particularly 40μ or less, indicate deteriorating conditions but the FAA advises against using them as the sole basis for landing performance assessments; they are best for trend analysis.
• Effective decision-making requires pilots to integrate all available information, including both types of reports, aircraft performance, and current weather conditions, as no direct correlation exists between subjective braking action and MU values.

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