How is the west end of a runway oriented east and west numbered?

The question pertains to how runway designations correspond to their orientation. Runways are numbered based on their magnetic heading, rounded to the nearest 10 degrees, and assigned a number corresponding to that heading.

In the case of a runway oriented east and west, the two ends of the runway must be considered. The west end, when oriented east and west, will have a magnetic heading close to 270 degrees. When rounding 270 degrees to the nearest ten, it is assigned the number 27. The opposite end, pointing east, would have a magnetic heading around 90 degrees, which is assigned the number 09.

Thus, the correct numbering for the west end of a runway oriented east and west is correctly represented by the number 09. This choice signifies the east end of the runway, as each number indicates which direction the runway is heading. Therefore, the selection of this number effectively reflects how directional orientation is translated into the numerical system used for runways.