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12.104 Landing Performance
12.104.2 Given typical performance data, demonstrate the ability to determine LDR.
Landing Distance Required (LDR) is the minimum distance required for an aircraft to land safely, and it is calculated based on a variety of factors such as aircraft weight, runway conditions, temperature, and altitude. Let's say we have a Boeing 737-800 with a landing weight of 120,000 pounds, landing on a dry runway at sea level. According to the aircraft's performance data, the required LDR is 3,000 feet. If the runway is wet instead of dry, the required LDR would increase to 3,500 feet. If the runway is contaminated with snow or ice, the required LDR would increase even further, to 4,000 feet. If the aircraft is landing at a high altitude airport, the required LDR would also increase. For example, if the aircraft is landing at an airport with an elevation of 5,000 feet, the required LDR would increase to 3,500 feet. Overall, pilots must consider a variety of factors when calculating the required LDR for an aircraft, and they must ensure that the aircraft is capable of landing safely before attempting to do so.