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Why Did These Runway Designations Change At Msp?  
User currently offlineN101AA From United States of America, joined Mar 2000, 14 posts, RR: 0
Posted (15 years 4 months 3 weeks 19 hours ago) and read 3343 times:

The two parallel runways at MSP are 12L/30R and 12R/30L. There's a photo on here from 1994 that shows them as being 11L/29R and 11R/29L. Why the change?

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Photo © Mark Abbott

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Click here for full size photo!

Photo © Mark Abbott


2 replies: All unread, jump to last
User currently offlineKALB From United States of America, joined Mar 2000, 573 posts, RR: 0
Reply 1, posted (15 years 4 months 3 weeks 18 hours ago) and read 3318 times:

Orientation of runways are to the magnetic north pole rather than to the geographical north pole. The magnetic north pole is not stationary, therefore as it "moves", runway designations may need to be changed.

User currently offlineYwg777 From Canada, joined Oct 1999, 1264 posts, RR: 1
Reply 2, posted (15 years 4 months 3 weeks 17 hours ago) and read 3316 times:

The reason why is because the heading of the old 29L,29R,11L,11R was say 295 and 115 dirgrees. useally you round 5 up. so they did that to 300 dirgrees and 120 dirgrees.

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