How are runway numbers determined?

• A. By the length of the runway
• B. Based on the aircraft's magnetic heading, rounded to the nearest ten degrees
• C. According to the type of aircraft using the runway
• D. By geographical coordinates

Answer: (B)

Runway numbers are determined based on the aircraft's magnetic heading, rounded to the nearest ten degrees. This method is essential for pilots and air traffic controllers as it provides a clear and standardized system for identifying runways. Each runway is aligned with its general compass direction, which helps pilots navigate effectively during takeoff and landing phases.

For example, if a runway has a magnetic heading of 90 degrees, it will be designated as Runway 09, as the number reflects the rounded heading. This system ensures consistency and safety in aviation operations, allowing pilots to quickly ascertain the orientation and designated use of runways, which is vital during various phases of flight, particularly in limited visibility situations.

The other choices are not correct because they do not accurately represent the methodology used for runway numbering. Length, aircraft type, or geographical coordinates do not influence how a runway number is assigned; the primary factor is the magnetic heading.