Established02 wrote: ↑29 Aug 2018, 13:55
Just curious, has there ever been a runway designator in the world which had to be corrected more than once for this particular reason? For example 07-25 => 06-24 => 05-23?
I don't have an example of such multiple changes but most probably it did happen here and there.
The annual Magnetic Variation varies more rapidly at higher latitudes especially when the RWY orientation is at odds with the location of the Magnetic North.
In fact in Canada, way up North in what they call the NDA, Northern Domestic Airspace, all aerodromes have their runways identified as True and not Mag for that reason.
It also seems that the rate of change of the MagVar shows an increase in the last 50 years. But nevertheless it will take 30-50 years to see EBBR in need for an adjustment.
Note that this adjustment is not something critical that must be done next week. It is a convention to "name" the RWY according to its Magnetic orientation (rounded to the nearest 10 degrees ...)
There is another factor to consider in "renaming" a runway is when their QFU is set wrongly on purpose.
LFPG/CDG is an example with four parallel runways. All aligned 265°Mag but named 26L, 26R, 27L and 27R for ease of ID and to avoid confusion.
H.A.
