Attachment 5
A5.5.2.4. Crosswind Template. A transparent crosswind template is a useful aid in carrying out
the windrose analysis. The template is essentially a series of three parallel lines drawn to the same
scale as the windrose circles. The allowable crosswind for the runway width establishes the
physical distance between the outer parallel lines and the centerline.
A5.5.3. Desired Runway Orientation. For the use of windrose diagrams and crosswind templates in
determining desirable runway orientations with respect to wind coverage, see Figure A5.4.
Figure A5.4. Windrose Analysis.
NOTE: A runway oriented 140--320 (true) would have 3.1 percent of winds exceeding the design
crosswind component of 19 km/h.
A5.6. Wind Coverage Requirements for Runways. Determine the runway orientation which provides
the greatest wind coverage within the allowable crosswind limits. Place runways to obtain at least 95
percent wind coverage of the maximum allowable crosswind components, as discussed in paragraph
A5.6.3. It is accepted practice to total the percentages of the segments appearing outside the limit lines and
to subtract this number from 100. For analysis purposes, winds are assumed to be uniformly distributed
A5-5
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