![]() There are more applications of the 60:1 rule in aviation than we could possibly cover here, so we'll stick with descent planning. Even if you think you're terrible at mental math (I think that on a near-daily basis), the 60:1 rule is something anyone can master. The 60:1 is one of the most powerful rules-of-thumb in aviation. How fast do you need to descend to meet your crossing restriction? The 60:1 Rule, Explained You're cruising at 120 knots ground speed. ![]() Or how about this: you're cruising IFR at 10,000' MSL, and ATC gives you a crossing restriction of 5,000' for a fix that's 10 miles ahead. How far out should you start your descent? ![]() You plan to descend at 500 feet per minute. You're flying at 5,000' MSL, going 90 knots groundspeed, and you need to descend to a pattern altitude of 2,000' MSL.
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