What is the correct heading for an aircraft initially positioned at RWY 10?

The correct heading for an aircraft initially positioned at RWY 10 is 100 degrees. The runway number represents its magnetic heading, rounded to the nearest ten degrees. Since RWY 10 is oriented towards 100 degrees, this means that the takeoff direction is along that heading.

To understand this better, it’s important to visualize the orientation of the runway. Runway 10 faces towards the magnetic bearing of 100 degrees, which indicates that an aircraft on this runway would be aligned for a takeoff heading of 100 degrees.

The other headings provided do not correspond to runway 10. A heading of 180 degrees would indicate a southward direction, 280 degrees would point west, and 360 degrees would indicate a northward flight path. Therefore, understanding the relationship between runway numbers and magnetic headings clarifies why 100 degrees is the correct answer for an aircraft positioned at RWY 10.