Which course reversal is permitted for the LOC RWY 18 approach to Lincoln?

The teardrop course reversal is permitted for the LOC RWY 18 approach to Lincoln because this type of maneuver is designed specifically for situations where the initial approach fix (IAF) does not align directly with the runway alignment. The teardrop maneuver allows pilots to effectively reposition for the final approach by first flying away from the course and then making a course reversal that leads back toward the IAF.

In the context of the LOC RWY 18 approach, the teardrop course reversal provides a safe and efficient means to adjust the aircraft's flight path in order to establish the correct alignment with the runway for landing. It offers a clear visual path and is particularly useful when the profile of the approach demands a specific maneuvering pattern to ensure proper spacing and altitude before reaching the final approach segment.

Understanding when and how to apply a teardrop reversal is critical for pilots, especially in this context, as it enhances situational awareness and aids in adhering to the required approach procedure. This is why this option is correct in relation to the approach procedure being discussed.