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Low Altitude IFR Enroute Chart, what is difference between green and blue airports?

Asked by: 22544 views Instrument Rating

In Low Altitude IFR Enroute Chart, what is difference between green and blue airports? The defintion from the legend is confusing for me. It says airports blue or green have an approved  instrument approach published.  Those in Blue have an approved  instrument approach in at least the  high altitude DOD Flips.  The wording used is confusing. 

 

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1 Answers

  1. Best Answer


    Eric H on Jan 13, 2017

    The difference between the blue and the green airports is actually easy to understand when you look at it from FL300.

    Both blue and green indicate that there is an instrument approach available at the airport. The blue airports have a “high” instrument approach. Meaning that the DoD has an approach that starts at or around FL180 and allows for a steep descent into the airport. The reason for this is to allow the military to practice instrument approaches into “simulated hostile environments” while flying in IMC.

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