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Old 10-22-2010, 10:40 AM   #1 (permalink)
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Default RVR to SM formula....

Used to have a very easy formula for converting RVR to statute miles, one that could be done in your head. Now I can't remember it, can anyone help me out?

Think you took the first two numbers of an RVR (1600) and divided by some number??????????
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Old 10-23-2010, 08:58 PM   #2 (permalink)
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a mile is 5000 feet, for RVR purposes. do the math in your head
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Old 10-27-2010, 03:13 PM   #3 (permalink)
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The FAA has assigned conversion values which do not have a very good mathematical correlation to each other. I know these off the top of my head...

1SM / 5000
3/4 SM / 4000
1/2 SM / 2400
1/4 SM / 1600

You can use reported vis instead of RVR for CAT-I and non-prec approaches only. CAT-II/III require RVR.
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