What is the rule of 3 in aviation?

A general rule of thumb for initial IFR descent planning in jets is the 3 to 1 formula. This means that it takes 3 NM to descend 1,000 feet. If an airplane is at FL 310 and the approach gate or initial approach fix is at 6,000 feet, the initial descent requirement equals 25,000 feet (31,000–6,000).



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The 1 in 60 rule states that if you're off course by 1NM after 60 miles flown, you have a 1-degree tracking error. Time to correct that heading! Another tip: If you're 60 miles away from a VOR, and you're off course by one degree, you're off course by one mile.

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It states that for each degree off (or displacement) over a distance of 60 nautical miles (NM), it will result in 1 NM off course.

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(1) A rest required under paragraph (b)(1) of this section may be scheduled for or reduced to a minimum of 8 hours if the flight crewmember is given a rest period of at least 10 hours that must begin no later than 24 hours after the commencement of the reduced rest period.

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Rule 85: Schedules, Delays, and Cancellation of Flights. Rule 87: Denied Boarding Compensation. Rule 90: Refunds. Rule 95: Amenities/Services for Delayed Passengers. Rule 97: Acceptance of Baggage.

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