1:60

Mr. Meragers "Letting Down Easy" (September 2007) helped remind me again of that quickly needed and often used relationship in aviation: If you travel one degree on a circle and you travel one mile, the circle has a radius of 60 miles. In other words, your distance traveled and the distance from the center of the circle has the ratio of 1:60. Remember how we used this to determine the distance we are from the NDB? Flying abeam the station, we travel one degree and note the time. The time required to fly to the NDB will be 60 times the time required to fly the single degree. Knowing our airspeed, we can compute distance from the station or, knowing the distance, our airspeed. This same "magic" ratio applies in descents, too. If you are 6000 feet (one nautical mile) from the airport, and you are 100 feet agl, you will be on a one-degree glide path (1:60). A three-degree flight path would be 300 feet agl at one nautical mile.

Key Takeaways:

• The "1:60 rule" is a versatile mathematical principle for aviators, useful for calculating distance from NDBs and planning descent rates for glide paths.
• Adopting IFR discipline in VFR traffic patterns, such as using standardized descent rates and airspeeds, can significantly improve landing precision and consistency.
• Pilot safety is paramount, with an emphasis on executing stabilized approaches and the critical role of instructors in fostering safe flying habits.
• Accuracy in aviation regulations and access to essential resources, like VNAV descent tables, are vital for safe and compliant flight operations.

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