What is the rule of 20 in aviation?

Definition: The 5/20 rule is a norm of the Indian Aviation Ministry under which national carriers are required to have five years of operational experience and a fleet of minimum 20 aircraft to fly overseas. This is applicable to all commercial aviation organisations flying passengers.



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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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That's why pilots are taught the 1 in 60 rule, which states that after 60 miles, a one-degree error in heading will result in straying off course by one mile. Which means the lake you planned to fly over could turn out to be a mountain.

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VOR stations are fairly short range: the signals are line-of-sight between transmitter and receiver and are useful for up to 200 nautical miles (370 kilometres). Each station broadcasts a VHF radio composite signal including the mentioned navigation and reference signal, station's identifier and voice, if so equipped.

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In aviation medicine, the 1% rule is a risk threshold that is applied to the medical fitness of pilots. The 1% rule states that a 1% per annum risk (See also risk management) of medical incapacitation is the threshold between acceptable and unacceptable.

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The 40:1 surface is calculated out to 22.09 nautical miles from the runway end within an arc of 180° centered along the runway centerline extended. These requirements are part of FAR Part 77.23(a)(3). This is TERPS criteria. The standard aircraft departure climb gradient (CG) is 200 feet per nautical mile.

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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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(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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b) The requirement for 5/20 is modified and all airlines can commence international operations provided that they deploy 20 aircraft or 20% of total capacity (in term of average number of seats on all departures put together), whichever is higher for domestic operations.

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