Runway designation markers shall be the whole number from 1 to 36 to the nearest ___ of the azimuth in degrees.

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Multiple Choice

Runway designation markers shall be the whole number from 1 to 36 to the nearest ___ of the azimuth in degrees.

The main idea here is that runway designators are tied to the magnetic azimuth of the runway, rounded to the nearest 10 degrees, so the numbers run from 01 to 36 around the circle. Expressing this as how the azimuth relates to the circle, the designation uses a unit that corresponds to one-tenth of the circle’s divisions when counting these ten-degree steps. That’s why the correct fill is 1/10 of the azimuth in degrees. In practice, a heading near 90 degrees is designated as 09, near 280 degrees as 28, and so on, because you’re effectively taking the azimuth, dividing by 10, and rounding to a whole number. The other options would imply much larger, non-ten-degree steps (half-circle, a full circle, or 72-degree steps), which is not how runway numbers are assigned.

The main idea here is that runway designators are tied to the magnetic azimuth of the runway, rounded to the nearest 10 degrees, so the numbers run from 01 to 36 around the circle. Expressing this as how the azimuth relates to the circle, the designation uses a unit that corresponds to one-tenth of the circle’s divisions when counting these ten-degree steps. That’s why the correct fill is 1/10 of the azimuth in degrees.

In practice, a heading near 90 degrees is designated as 09, near 280 degrees as 28, and so on, because you’re effectively taking the azimuth, dividing by 10, and rounding to a whole number. The other options would imply much larger, non-ten-degree steps (half-circle, a full circle, or 72-degree steps), which is not how runway numbers are assigned.

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