What is an example of exemption 3585?

For example, the main body of the forecast may have the visibility at one-half mile, but a TEMPO phrase may show a possible drop to on-quarter mile at the ETA. When this happens, the airlines that have been granted approval to do so can use what is called Exemption 3585.



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It's called the 3-2-1 rule, and it's the easiest way to remember the regulation. To recap, if the weather at your destination isn't at least 3 SM of visibility and 2000' AGL ceilings from 1 hour before to 1 hour after your ETA, you need to file an alternate.

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Follow the 21-day rule for last-minute travel Keyes suggests booking your ticket at least 21 days before departure (if possible), since airlines have policies that will substantially raise the price of airfare for trips taking place after that deadline.

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  • Maximum of five pilots, including SIC's,
  • Maximum of 5 aircraft can be used in their operation,
  • Maximum of 3 different types of aircraft can be used,
  • Aircraft are limited to those type certificated with 9 passenger seats or less,
  • Operations are limited to the United States, Canada, Mexico, and the Caribbean,


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14 CFR 91.169 (b) (2) (i) states that an alternate airport is not required if “for at least 1 hour before and for 1 hour after the estimated time of arrival the ceiling will be at least 2000 feet above the airport elevation and the visibility will be at least 3 statute miles.” To help remember those conditions of the ...

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