What approach heading should an aircraft establish when instructed to land on Rwy 23L?

When an aircraft is instructed to land on Runway 23L, it should establish an approach heading aligned with the runway's orientation. Runway numbers are based on their magnetic azimuth rounded to the nearest ten degrees. Therefore, 23L indicates that the runway is oriented approximately 230 degrees magnetic.

Setting the aircraft's heading to 230 degrees will align it properly with the runway for a safe landing. This means the aircraft will approach from the west-southwest direction, which corresponds precisely with the orientation of Runway 23L. Understanding this principle is crucial for pilots to ensure correct navigation and safe operations in aviation.